implementation.js

"use strict";

var htmlNamespace = "http://www.w3.org/1999/xhtml";

var cssStylingFlag = false;

var defaultSingleLineContainerName = "p";

// This is bad :(
var globalRange = null;

// Commands are stored in a dictionary where we call their actions and such
var commands = {};

///////////////////////////////////////////////////////////////////////////////
////////////////////////////// Utility functions //////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//@{

function nextNode(node) {
	if (node.hasChildNodes()) {
		return node.firstChild;
	}
	return nextNodeDescendants(node);
}

function previousNode(node) {
	if (node.previousSibling) {
		node = node.previousSibling;
		while (node.hasChildNodes()) {
			node = node.lastChild;
		}
		return node;
	}
	if (node.parentNode
	&& node.parentNode.nodeType == Node.ELEMENT_NODE) {
		return node.parentNode;
	}
	return null;
}

function nextNodeDescendants(node) {
	while (node && !node.nextSibling) {
		node = node.parentNode;
	}
	if (!node) {
		return null;
	}
	return node.nextSibling;
}

/**
 * Returns true if ancestor is an ancestor of descendant, false otherwise.
 */
function isAncestor(ancestor, descendant) {
	return ancestor
		&& descendant
		&& Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
}

/**
 * Returns true if ancestor is an ancestor of or equal to descendant, false
 * otherwise.
 */
function isAncestorContainer(ancestor, descendant) {
	return (ancestor || descendant)
		&& (ancestor == descendant || isAncestor(ancestor, descendant));
}

/**
 * Returns true if descendant is a descendant of ancestor, false otherwise.
 */
function isDescendant(descendant, ancestor) {
	return ancestor
		&& descendant
		&& Boolean(ancestor.compareDocumentPosition(descendant) & Node.DOCUMENT_POSITION_CONTAINED_BY);
}

/**
 * Returns true if node1 is before node2 in tree order, false otherwise.
 */
function isBefore(node1, node2) {
	return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_FOLLOWING);
}

/**
 * Returns true if node1 is after node2 in tree order, false otherwise.
 */
function isAfter(node1, node2) {
	return Boolean(node1.compareDocumentPosition(node2) & Node.DOCUMENT_POSITION_PRECEDING);
}

function getAncestors(node) {
	var ancestors = [];
	while (node.parentNode) {
		ancestors.unshift(node.parentNode);
		node = node.parentNode;
	}
	return ancestors;
}

function getInclusiveAncestors(node) {
	return getAncestors(node).concat(node);
}

function getDescendants(node) {
	var descendants = [];
	var stop = nextNodeDescendants(node);
	while ((node = nextNode(node))
	&& node != stop) {
		descendants.push(node);
	}
	return descendants;
}

function getInclusiveDescendants(node) {
	return [node].concat(getDescendants(node));
}

function convertProperty(property) {
	// Special-case for now
	var map = {
		"fontFamily": "font-family",
		"fontSize": "font-size",
		"fontStyle": "font-style",
		"fontWeight": "font-weight",
		"textDecoration": "text-decoration",
	};
	if (typeof map[property] != "undefined") {
		return map[property];
	}

	return property;
}

// Return the <font size=X> value for the given CSS size, or undefined if there
// is none.
function cssSizeToLegacy(cssVal) {
	return {
		"x-small": 1,
		"small": 2,
		"medium": 3,
		"large": 4,
		"x-large": 5,
		"xx-large": 6,
		"xxx-large": 7
	}[cssVal];
}

// Return the CSS size given a legacy size.
function legacySizeToCss(legacyVal) {
	return {
		1: "x-small",
		2: "small",
		3: "medium",
		4: "large",
		5: "x-large",
		6: "xx-large",
		7: "xxx-large",
	}[legacyVal];
}

// Opera 11 puts HTML elements in the null namespace, it seems.
function isHtmlNamespace(ns) {
	return ns === null
		|| ns === htmlNamespace;
}

// "the directionality" from HTML.  I don't bother caring about non-HTML
// elements.
//
// "The directionality of an element is either 'ltr' or 'rtl', and is
// determined as per the first appropriate set of steps from the following
// list:"
function getDirectionality(element) {
	// "If the element's dir attribute is in the ltr state
	//     The directionality of the element is 'ltr'."
	if (element.dir == "ltr") {
		return "ltr";
	}

	// "If the element's dir attribute is in the rtl state
	//     The directionality of the element is 'rtl'."
	if (element.dir == "rtl") {
		return "rtl";
	}

	// "If the element's dir attribute is in the auto state
	// "If the element is a bdi element and the dir attribute is not in a
	// defined state (i.e. it is not present or has an invalid value)
	//     [lots of complicated stuff]
	//
	// Skip this, since no browser implements it anyway.

	// "If the element is a root element and the dir attribute is not in a
	// defined state (i.e. it is not present or has an invalid value)
	//     The directionality of the element is 'ltr'."
	if (!isHtmlElement(element.parentNode)) {
		return "ltr";
	}

	// "If the element has a parent element and the dir attribute is not in a
	// defined state (i.e. it is not present or has an invalid value)
	//     The directionality of the element is the same as the element's
	//     parent element's directionality."
	return getDirectionality(element.parentNode);
}

//@}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////// DOM Range functions /////////////////////////////
///////////////////////////////////////////////////////////////////////////////
//@{

function getNodeIndex(node) {
	var ret = 0;
	while (node.previousSibling) {
		ret++;
		node = node.previousSibling;
	}
	return ret;
}

// "The length of a Node node is the following, depending on node:
//
// ProcessingInstruction
// DocumentType
//   Always 0.
// Text
// Comment
//   node's length.
// Any other node
//   node's childNodes's length."
function getNodeLength(node) {
	switch (node.nodeType) {
		case Node.PROCESSING_INSTRUCTION_NODE:
		case Node.DOCUMENT_TYPE_NODE:
			return 0;

		case Node.TEXT_NODE:
		case Node.COMMENT_NODE:
			return node.length;

		default:
			return node.childNodes.length;
	}
}

/**
 * The position of two boundary points relative to one another, as defined by
 * DOM Range.
 */
function getPosition(nodeA, offsetA, nodeB, offsetB) {
	// "If node A is the same as node B, return equal if offset A equals offset
	// B, before if offset A is less than offset B, and after if offset A is
	// greater than offset B."
	if (nodeA == nodeB) {
		if (offsetA == offsetB) {
			return "equal";
		}
		if (offsetA < offsetB) {
			return "before";
		}
		if (offsetA > offsetB) {
			return "after";
		}
	}

	// "If node A is after node B in tree order, compute the position of (node
	// B, offset B) relative to (node A, offset A). If it is before, return
	// after. If it is after, return before."
	if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_FOLLOWING) {
		var pos = getPosition(nodeB, offsetB, nodeA, offsetA);
		if (pos == "before") {
			return "after";
		}
		if (pos == "after") {
			return "before";
		}
	}

	// "If node A is an ancestor of node B:"
	if (nodeB.compareDocumentPosition(nodeA) & Node.DOCUMENT_POSITION_CONTAINS) {
		// "Let child equal node B."
		var child = nodeB;

		// "While child is not a child of node A, set child to its parent."
		while (child.parentNode != nodeA) {
			child = child.parentNode;
		}

		// "If the index of child is less than offset A, return after."
		if (getNodeIndex(child) < offsetA) {
			return "after";
		}
	}

	// "Return before."
	return "before";
}

/**
 * Returns the furthest ancestor of a Node as defined by DOM Range.
 */
function getFurthestAncestor(node) {
	var root = node;
	while (root.parentNode != null) {
		root = root.parentNode;
	}
	return root;
}

/**
 * "contained" as defined by DOM Range: "A Node node is contained in a range
 * range if node's furthest ancestor is the same as range's root, and (node, 0)
 * is after range's start, and (node, length of node) is before range's end."
 */
function isContained(node, range) {
	var pos1 = getPosition(node, 0, range.startContainer, range.startOffset);
	var pos2 = getPosition(node, getNodeLength(node), range.endContainer, range.endOffset);

	return getFurthestAncestor(node) == getFurthestAncestor(range.startContainer)
		&& pos1 == "after"
		&& pos2 == "before";
}

/**
 * Return all nodes contained in range that the provided function returns true
 * for, omitting any with an ancestor already being returned.
 */
function getContainedNodes(range, condition) {
	if (typeof condition == "undefined") {
		condition = function() { return true };
	}
	var node = range.startContainer;
	if (node.hasChildNodes()
	&& range.startOffset < node.childNodes.length) {
		// A child is contained
		node = node.childNodes[range.startOffset];
	} else if (range.startOffset == getNodeLength(node)) {
		// No descendant can be contained
		node = nextNodeDescendants(node);
	} else {
		// No children; this node at least can't be contained
		node = nextNode(node);
	}

	var stop = range.endContainer;
	if (stop.hasChildNodes()
	&& range.endOffset < stop.childNodes.length) {
		// The node after the last contained node is a child
		stop = stop.childNodes[range.endOffset];
	} else {
		// This node and/or some of its children might be contained
		stop = nextNodeDescendants(stop);
	}

	var nodeList = [];
	while (isBefore(node, stop)) {
		if (isContained(node, range)
		&& condition(node)) {
			nodeList.push(node);
			node = nextNodeDescendants(node);
			continue;
		}
		node = nextNode(node);
	}
	return nodeList;
}

/**
 * As above, but includes nodes with an ancestor that's already been returned.
 */
function getAllContainedNodes(range, condition) {
	if (typeof condition == "undefined") {
		condition = function() { return true };
	}
	var node = range.startContainer;
	if (node.hasChildNodes()
	&& range.startOffset < node.childNodes.length) {
		// A child is contained
		node = node.childNodes[range.startOffset];
	} else if (range.startOffset == getNodeLength(node)) {
		// No descendant can be contained
		node = nextNodeDescendants(node);
	} else {
		// No children; this node at least can't be contained
		node = nextNode(node);
	}

	var stop = range.endContainer;
	if (stop.hasChildNodes()
	&& range.endOffset < stop.childNodes.length) {
		// The node after the last contained node is a child
		stop = stop.childNodes[range.endOffset];
	} else {
		// This node and/or some of its children might be contained
		stop = nextNodeDescendants(stop);
	}

	var nodeList = [];
	while (isBefore(node, stop)) {
		if (isContained(node, range)
		&& condition(node)) {
			nodeList.push(node);
		}
		node = nextNode(node);
	}
	return nodeList;
}

// Returns either null, or something of the form rgb(x, y, z), or something of
// the form rgb(x, y, z, w) with w != 0.
function normalizeColor(color) {
	if (color.toLowerCase() == "currentcolor") {
		return null;
	}

	if (normalizeColor.resultCache === undefined) {
		normalizeColor.resultCache = {};
	}

	if (normalizeColor.resultCache[color] !== undefined) {
		return normalizeColor.resultCache[color];
	}

	var originalColor = color;

	var outerSpan = document.createElement("span");
	document.body.appendChild(outerSpan);
	outerSpan.style.color = "black";

	var innerSpan = document.createElement("span");
	outerSpan.appendChild(innerSpan);
	innerSpan.style.color = color;
	color = getComputedStyle(innerSpan).color;

	if (color == "rgb(0, 0, 0)") {
		// Maybe it's really black, maybe it's invalid.
		outerSpan.color = "white";
		color = getComputedStyle(innerSpan).color;
		if (color != "rgb(0, 0, 0)") {
			return normalizeColor.resultCache[originalColor] = null;
		}
	}

	document.body.removeChild(outerSpan);

	// I rely on the fact that browsers generally provide consistent syntax for
	// getComputedStyle(), although it's not standardized.  There are only
	// three exceptions I found:
	if (/^rgba\([0-9]+, [0-9]+, [0-9]+, 1\)$/.test(color)) {
		// IE10PP2 seems to do this sometimes.
		return normalizeColor.resultCache[originalColor] =
			color.replace("rgba", "rgb").replace(", 1)", ")");
	}
	if (color == "transparent") {
		// IE10PP2, Firefox 7.0a2, and Opera 11.50 all return "transparent" if
		// the specified value is "transparent".
		return normalizeColor.resultCache[originalColor] =
			"rgba(0, 0, 0, 0)";
	}
	// Chrome 15 dev adds way too many significant figures.  This isn't a full
	// fix, it just fixes one case that comes up in tests.
	color = color.replace(/, 0.496094\)$/, ", 0.5)");
	return normalizeColor.resultCache[originalColor] = color;
}

// Returns either null, or something of the form #xxxxxx.
function parseSimpleColor(color) {
	color = normalizeColor(color);
	var matches = /^rgb\(([0-9]+), ([0-9]+), ([0-9]+)\)$/.exec(color);
	if (matches) {
		return "#"
			+ parseInt(matches[1]).toString(16).replace(/^.$/, "0$&")
			+ parseInt(matches[2]).toString(16).replace(/^.$/, "0$&")
			+ parseInt(matches[3]).toString(16).replace(/^.$/, "0$&");
	}
	return null;
}

//@}

//////////////////////////////////////////////////////////////////////////////
/////////////////////////// Edit command functions ///////////////////////////
//////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////
///// Methods of the HTMLDocument interface /////
/////////////////////////////////////////////////
//@{

var executionStackDepth = 0;

// Helper function for common behavior.
function editCommandMethod(command, range, callback) {
	// Set up our global range magic, but only if we're the outermost function
	if (executionStackDepth == 0 && typeof range != "undefined") {
		globalRange = range;
	} else if (executionStackDepth == 0) {
		globalRange = null;
		globalRange = getActiveRange();
	}

	executionStackDepth++;
	try {
		var ret = callback();
	} catch(e) {
		executionStackDepth--;
		throw e;
	}
	executionStackDepth--;
	return ret;
}

function myExecCommand(command, showUi, value, range) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	// "If only one argument was provided, let show UI be false."
	//
	// If range was passed, I can't actually detect how many args were passed
	// . . .
	if (arguments.length == 1
	|| (arguments.length >=4 && typeof showUi == "undefined")) {
		showUi = false;
	}

	// "If only one or two arguments were provided, let value be the empty
	// string."
	if (arguments.length <= 2
	|| (arguments.length >=4 && typeof value == "undefined")) {
		value = "";
	}

	return editCommandMethod(command, range, (function(command, showUi, value) { return function() {
		// "If command is not supported or not enabled, return false."
		if (!(command in commands) || !myQueryCommandEnabled(command)) {
			return false;
		}

		// "Take the action for command, passing value to the instructions as an
		// argument."
		var ret = commands[command].action(value);

		// Check for bugs
		if (ret !== true && ret !== false) {
			throw "execCommand() didn't return true or false: " + ret;
		}

		// "If the previous step returned false, return false."
		if (ret === false) {
			return false;
		}

		// "Return true."
		return true;
	}})(command, showUi, value));
}

function myQueryCommandEnabled(command, range) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	return editCommandMethod(command, range, (function(command) { return function() {
		// "Return true if command is both supported and enabled, false
		// otherwise."
		if (!(command in commands)) {
			return false;
		}

		// "Among commands defined in this specification, those listed in
		// Miscellaneous commands are always enabled, except for the cut
		// command and the paste command. The other commands defined here are
		// enabled if the active range is not null, its start node is either
		// editable or an editing host, its end node is either editable or an
		// editing host, and there is some editing host that is an inclusive
		// ancestor of both its start node and its end node."
		return ["copy", "defaultparagraphseparator", "selectall", "stylewithcss",
		"usecss"].indexOf(command) != -1
			|| (
				getActiveRange() !== null
				&& (isEditable(getActiveRange().startContainer) || isEditingHost(getActiveRange().startContainer))
				&& (isEditable(getActiveRange().endContainer) || isEditingHost(getActiveRange().endContainer))
				&& (getInclusiveAncestors(getActiveRange().commonAncestorContainer).some(isEditingHost))
			);
	}})(command));
}

function myQueryCommandIndeterm(command, range) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	return editCommandMethod(command, range, (function(command) { return function() {
		// "If command is not supported or has no indeterminacy, return false."
		if (!(command in commands) || !("indeterm" in commands[command])) {
			return false;
		}

		// "Return true if command is indeterminate, otherwise false."
		return commands[command].indeterm();
	}})(command));
}

function myQueryCommandState(command, range) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	return editCommandMethod(command, range, (function(command) { return function() {
		// "If command is not supported or has no state, return false."
		if (!(command in commands) || !("state" in commands[command])) {
			return false;
		}

		// "If the state override for command is set, return it."
		if (typeof getStateOverride(command) != "undefined") {
			return getStateOverride(command);
		}

		// "Return true if command's state is true, otherwise false."
		return commands[command].state();
	}})(command));
}

// "When the queryCommandSupported(command) method on the HTMLDocument
// interface is invoked, the user agent must return true if command is
// supported, and false otherwise."
function myQueryCommandSupported(command) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	return command in commands;
}

function myQueryCommandValue(command, range) {
	// "All of these methods must treat their command argument ASCII
	// case-insensitively."
	command = command.toLowerCase();

	return editCommandMethod(command, range, function() {
		// "If command is not supported or has no value, return the empty string."
		if (!(command in commands) || !("value" in commands[command])) {
			return "";
		}

		// "If command is "fontSize" and its value override is set, convert the
		// value override to an integer number of pixels and return the legacy
		// font size for the result."
		if (command == "fontsize"
		&& getValueOverride("fontsize") !== undefined) {
			return getLegacyFontSize(getValueOverride("fontsize"));
		}

		// "If the value override for command is set, return it."
		if (typeof getValueOverride(command) != "undefined") {
			return getValueOverride(command);
		}

		// "Return command's value."
		return commands[command].value();
	});
}
//@}

//////////////////////////////
///// Common definitions /////
//////////////////////////////
//@{

// "An HTML element is an Element whose namespace is the HTML namespace."
//
// I allow an extra argument to more easily check whether something is a
// particular HTML element, like isHtmlElement(node, "OL").  It accepts arrays
// too, like isHtmlElement(node, ["OL", "UL"]) to check if it's an ol or ul.
function isHtmlElement(node, tags) {
	if (typeof tags == "string") {
		tags = [tags];
	}
	if (typeof tags == "object") {
		tags = tags.map(function(tag) { return tag.toUpperCase() });
	}
	return node
		&& node.nodeType == Node.ELEMENT_NODE
		&& isHtmlNamespace(node.namespaceURI)
		&& (typeof tags == "undefined" || tags.indexOf(node.tagName) != -1);
}

// "A prohibited paragraph child name is "address", "article", "aside",
// "blockquote", "caption", "center", "col", "colgroup", "dd", "details",
// "dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
// "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
// "listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
// "summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul", or
// "xmp"."
var prohibitedParagraphChildNames = ["address", "article", "aside",
	"blockquote", "caption", "center", "col", "colgroup", "dd", "details",
	"dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer",
	"form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hgroup", "hr", "li",
	"listing", "menu", "nav", "ol", "p", "plaintext", "pre", "section",
	"summary", "table", "tbody", "td", "tfoot", "th", "thead", "tr", "ul",
	"xmp"];

// "A prohibited paragraph child is an HTML element whose local name is a
// prohibited paragraph child name."
function isProhibitedParagraphChild(node) {
	return isHtmlElement(node, prohibitedParagraphChildNames);
}

// "A block node is either an Element whose "display" property does not have
// resolved value "inline" or "inline-block" or "inline-table" or "none", or a
// Document, or a DocumentFragment."
function isBlockNode(node) {
	return node
		&& ((node.nodeType == Node.ELEMENT_NODE && ["inline", "inline-block", "inline-table", "none"].indexOf(getComputedStyle(node).display) == -1)
		|| node.nodeType == Node.DOCUMENT_NODE
		|| node.nodeType == Node.DOCUMENT_FRAGMENT_NODE);
}

// "An inline node is a node that is not a block node."
function isInlineNode(node) {
	return node && !isBlockNode(node);
}

// "An editing host is a node that is either an HTML element with a
// contenteditable attribute set to the true state, or the HTML element child
// of a Document whose designMode is enabled."
function isEditingHost(node) {
	return node
		&& isHtmlElement(node)
		&& (node.contentEditable == "true"
		|| (node.parentNode
		&& node.parentNode.nodeType == Node.DOCUMENT_NODE
		&& node.parentNode.designMode == "on"));
}

// "Something is editable if it is a node; it is not an editing host; it does
// not have a contenteditable attribute set to the false state; its parent is
// an editing host or editable; and either it is an HTML element, or it is an
// svg or math element, or it is not an Element and its parent is an HTML
// element."
function isEditable(node) {
	return node
		&& !isEditingHost(node)
		&& (node.nodeType != Node.ELEMENT_NODE || node.contentEditable != "false")
		&& (isEditingHost(node.parentNode) || isEditable(node.parentNode))
		&& (isHtmlElement(node)
		|| (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/2000/svg" && node.localName == "svg")
		|| (node.nodeType == Node.ELEMENT_NODE && node.namespaceURI == "http://www.w3.org/1998/Math/MathML" && node.localName == "math")
		|| (node.nodeType != Node.ELEMENT_NODE && isHtmlElement(node.parentNode)));
}

// Helper function, not defined in the spec
function hasEditableDescendants(node) {
	for (var i = 0; i < node.childNodes.length; i++) {
		if (isEditable(node.childNodes[i])
		|| hasEditableDescendants(node.childNodes[i])) {
			return true;
		}
	}
	return false;
}

// "The editing host of node is null if node is neither editable nor an editing
// host; node itself, if node is an editing host; or the nearest ancestor of
// node that is an editing host, if node is editable."
function getEditingHostOf(node) {
	if (isEditingHost(node)) {
		return node;
	} else if (isEditable(node)) {
		var ancestor = node.parentNode;
		while (!isEditingHost(ancestor)) {
			ancestor = ancestor.parentNode;
		}
		return ancestor;
	} else {
		return null;
	}
}

// "Two nodes are in the same editing host if the editing host of the first is
// non-null and the same as the editing host of the second."
function inSameEditingHost(node1, node2) {
	return getEditingHostOf(node1)
		&& getEditingHostOf(node1) == getEditingHostOf(node2);
}

// "A collapsed line break is a br that begins a line box which has nothing
// else in it, and therefore has zero height."
function isCollapsedLineBreak(br) {
	if (!isHtmlElement(br, "br")) {
		return false;
	}

	// Add a zwsp after it and see if that changes the height of the nearest
	// non-inline parent.  Note: this is not actually reliable, because the
	// parent might have a fixed height or something.
	var ref = br.parentNode;
	while (getComputedStyle(ref).display == "inline") {
		ref = ref.parentNode;
	}
	var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
	ref.style.height = "auto";
	ref.style.maxHeight = "none";
	ref.style.minHeight = "0";
	var space = document.createTextNode("\u200b");
	var origHeight = ref.offsetHeight;
	if (origHeight == 0) {
		throw "isCollapsedLineBreak: original height is zero, bug?";
	}
	br.parentNode.insertBefore(space, br.nextSibling);
	var finalHeight = ref.offsetHeight;
	space.parentNode.removeChild(space);
	if (refStyle === null) {
		// Without the setAttribute() line, removeAttribute() doesn't work in
		// Chrome 14 dev.  I have no idea why.
		ref.setAttribute("style", "");
		ref.removeAttribute("style");
	} else {
		ref.setAttribute("style", refStyle);
	}

	// Allow some leeway in case the zwsp didn't create a whole new line, but
	// only made an existing line slightly higher.  Firefox 6.0a2 shows this
	// behavior when the first line is bold.
	return origHeight < finalHeight - 5;
}

// "An extraneous line break is a br that has no visual effect, in that
// removing it from the DOM would not change layout, except that a br that is
// the sole child of an li is not extraneous."
//
// FIXME: This doesn't work in IE, since IE ignores display: none in
// contenteditable.
function isExtraneousLineBreak(br) {
	if (!isHtmlElement(br, "br")) {
		return false;
	}

	if (isHtmlElement(br.parentNode, "li")
	&& br.parentNode.childNodes.length == 1) {
		return false;
	}

	// Make the line break disappear and see if that changes the block's
	// height.  Yes, this is an absurd hack.  We have to reset height etc. on
	// the reference node because otherwise its height won't change if it's not
	// auto.
	var ref = br.parentNode;
	while (getComputedStyle(ref).display == "inline") {
		ref = ref.parentNode;
	}
	var refStyle = ref.hasAttribute("style") ? ref.getAttribute("style") : null;
	ref.style.height = "auto";
	ref.style.maxHeight = "none";
	ref.style.minHeight = "0";
	var brStyle = br.hasAttribute("style") ? br.getAttribute("style") : null;
	var origHeight = ref.offsetHeight;
	if (origHeight == 0) {
		throw "isExtraneousLineBreak: original height is zero, bug?";
	}
	br.setAttribute("style", "display:none");
	var finalHeight = ref.offsetHeight;
	if (refStyle === null) {
		// Without the setAttribute() line, removeAttribute() doesn't work in
		// Chrome 14 dev.  I have no idea why.
		ref.setAttribute("style", "");
		ref.removeAttribute("style");
	} else {
		ref.setAttribute("style", refStyle);
	}
	if (brStyle === null) {
		br.removeAttribute("style");
	} else {
		br.setAttribute("style", brStyle);
	}

	return origHeight == finalHeight;
}

// "A whitespace node is either a Text node whose data is the empty string; or
// a Text node whose data consists only of one or more tabs (0x0009), line
// feeds (0x000A), carriage returns (0x000D), and/or spaces (0x0020), and whose
// parent is an Element whose resolved value for "white-space" is "normal" or
// "nowrap"; or a Text node whose data consists only of one or more tabs
// (0x0009), carriage returns (0x000D), and/or spaces (0x0020), and whose
// parent is an Element whose resolved value for "white-space" is "pre-line"."
function isWhitespaceNode(node) {
	return node
		&& node.nodeType == Node.TEXT_NODE
		&& (node.data == ""
		|| (
			/^[\t\n\r ]+$/.test(node.data)
			&& node.parentNode
			&& node.parentNode.nodeType == Node.ELEMENT_NODE
			&& ["normal", "nowrap"].indexOf(getComputedStyle(node.parentNode).whiteSpace) != -1
		) || (
			/^[\t\r ]+$/.test(node.data)
			&& node.parentNode
			&& node.parentNode.nodeType == Node.ELEMENT_NODE
			&& getComputedStyle(node.parentNode).whiteSpace == "pre-line"
		));
}

// "node is a collapsed whitespace node if the following algorithm returns
// true:"
function isCollapsedWhitespaceNode(node) {
	// "If node is not a whitespace node, return false."
	if (!isWhitespaceNode(node)) {
		return false;
	}

	// "If node's data is the empty string, return true."
	if (node.data == "") {
		return true;
	}

	// "Let ancestor be node's parent."
	var ancestor = node.parentNode;

	// "If ancestor is null, return true."
	if (!ancestor) {
		return true;
	}

	// "If the "display" property of some ancestor of node has resolved value
	// "none", return true."
	if (getAncestors(node).some(function(ancestor) {
		return ancestor.nodeType == Node.ELEMENT_NODE
			&& getComputedStyle(ancestor).display == "none";
	})) {
		return true;
	}

	// "While ancestor is not a block node and its parent is not null, set
	// ancestor to its parent."
	while (!isBlockNode(ancestor)
	&& ancestor.parentNode) {
		ancestor = ancestor.parentNode;
	}

	// "Let reference be node."
	var reference = node;

	// "While reference is a descendant of ancestor:"
	while (reference != ancestor) {
		// "Let reference be the node before it in tree order."
		reference = previousNode(reference);

		// "If reference is a block node or a br, return true."
		if (isBlockNode(reference)
		|| isHtmlElement(reference, "br")) {
			return true;
		}

		// "If reference is a Text node that is not a whitespace node, or is an
		// img, break from this loop."
		if ((reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
		|| isHtmlElement(reference, "img")) {
			break;
		}
	}

	// "Let reference be node."
	reference = node;

	// "While reference is a descendant of ancestor:"
	var stop = nextNodeDescendants(ancestor);
	while (reference != stop) {
		// "Let reference be the node after it in tree order, or null if there
		// is no such node."
		reference = nextNode(reference);

		// "If reference is a block node or a br, return true."
		if (isBlockNode(reference)
		|| isHtmlElement(reference, "br")) {
			return true;
		}

		// "If reference is a Text node that is not a whitespace node, or is an
		// img, break from this loop."
		if ((reference && reference.nodeType == Node.TEXT_NODE && !isWhitespaceNode(reference))
		|| isHtmlElement(reference, "img")) {
			break;
		}
	}

	// "Return false."
	return false;
}

// "Something is visible if it is a node that either is a block node, or a Text
// node that is not a collapsed whitespace node, or an img, or a br that is not
// an extraneous line break, or any node with a visible descendant; excluding
// any node with an ancestor container Element whose "display" property has
// resolved value "none"."
function isVisible(node) {
	if (!node) {
		return false;
	}

	if (getAncestors(node).concat(node)
	.filter(function(node) { return node.nodeType == Node.ELEMENT_NODE })
	.some(function(node) { return getComputedStyle(node).display == "none" })) {
		return false;
	}

	if (isBlockNode(node)
	|| (node.nodeType == Node.TEXT_NODE && !isCollapsedWhitespaceNode(node))
	|| isHtmlElement(node, "img")
	|| (isHtmlElement(node, "br") && !isExtraneousLineBreak(node))) {
		return true;
	}

	for (var i = 0; i < node.childNodes.length; i++) {
		if (isVisible(node.childNodes[i])) {
			return true;
		}
	}

	return false;
}

// "Something is invisible if it is a node that is not visible."
function isInvisible(node) {
	return node && !isVisible(node);
}

// "A collapsed block prop is either a collapsed line break that is not an
// extraneous line break, or an Element that is an inline node and whose
// children are all either invisible or collapsed block props and that has at
// least one child that is a collapsed block prop."
function isCollapsedBlockProp(node) {
	if (isCollapsedLineBreak(node)
	&& !isExtraneousLineBreak(node)) {
		return true;
	}

	if (!isInlineNode(node)
	|| node.nodeType != Node.ELEMENT_NODE) {
		return false;
	}

	var hasCollapsedBlockPropChild = false;
	for (var i = 0; i < node.childNodes.length; i++) {
		if (!isInvisible(node.childNodes[i])
		&& !isCollapsedBlockProp(node.childNodes[i])) {
			return false;
		}
		if (isCollapsedBlockProp(node.childNodes[i])) {
			hasCollapsedBlockPropChild = true;
		}
	}

	return hasCollapsedBlockPropChild;
}

// "The active range is the range of the selection given by calling
// getSelection() on the context object. (Thus the active range may be null.)"
//
// We cheat and return globalRange if that's defined.  We also ensure that the
// active range meets the requirements that selection boundary points are
// supposed to meet, i.e., that the nodes are both Text or Element nodes that
// descend from a Document.
function getActiveRange() {
	var ret;
	if (globalRange) {
		ret = globalRange;
	} else if (getSelection().rangeCount) {
		ret = getSelection().getRangeAt(0);
	} else {
		return null;
	}
	if ([Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.startContainer.nodeType) == -1
	|| [Node.TEXT_NODE, Node.ELEMENT_NODE].indexOf(ret.endContainer.nodeType) == -1
	|| !ret.startContainer.ownerDocument
	|| !ret.endContainer.ownerDocument
	|| !isDescendant(ret.startContainer, ret.startContainer.ownerDocument)
	|| !isDescendant(ret.endContainer, ret.endContainer.ownerDocument)) {
		throw "Invalid active range; test bug?";
	}
	return ret;
}

// "For some commands, each HTMLDocument must have a boolean state override
// and/or a string value override. These do not change the command's state or
// value, but change the way some algorithms behave, as specified in those
// algorithms' definitions. Initially, both must be unset for every command.
// Whenever the number of ranges in the Selection changes to something
// different, and whenever a boundary point of the range at a given index in
// the Selection changes to something different, the state override and value
// override must be unset for every command."
//
// We implement this crudely by using setters and getters.  To verify that the
// selection hasn't changed, we copy the active range and just check the
// endpoints match.  This isn't really correct, but it's good enough for us.
// Unset state/value overrides are undefined.  We put everything in a function
// so no one can access anything except via the provided functions, since
// otherwise callers might mistakenly use outdated overrides (if the selection
// has changed).
var getStateOverride, setStateOverride, unsetStateOverride,
	getValueOverride, setValueOverride, unsetValueOverride;
(function() {
	var stateOverrides = {};
	var valueOverrides = {};
	var storedRange = null;

	function resetOverrides() {
		if (!storedRange
		|| storedRange.startContainer != getActiveRange().startContainer
		|| storedRange.endContainer != getActiveRange().endContainer
		|| storedRange.startOffset != getActiveRange().startOffset
		|| storedRange.endOffset != getActiveRange().endOffset) {
			stateOverrides = {};
			valueOverrides = {};
			storedRange = getActiveRange().cloneRange();
		}
	}

	getStateOverride = function(command) {
		resetOverrides();
		return stateOverrides[command];
	};

	setStateOverride = function(command, newState) {
		resetOverrides();
		stateOverrides[command] = newState;
	};

	unsetStateOverride = function(command) {
		resetOverrides();
		delete stateOverrides[command];
	}

	getValueOverride = function(command) {
		resetOverrides();
		return valueOverrides[command];
	}

	// "The value override for the backColor command must be the same as the
	// value override for the hiliteColor command, such that setting one sets
	// the other to the same thing and unsetting one unsets the other."
	setValueOverride = function(command, newValue) {
		resetOverrides();
		valueOverrides[command] = newValue;
		if (command == "backcolor") {
			valueOverrides.hilitecolor = newValue;
		} else if (command == "hilitecolor") {
			valueOverrides.backcolor = newValue;
		}
	}

	unsetValueOverride = function(command) {
		resetOverrides();
		delete valueOverrides[command];
		if (command == "backcolor") {
			delete valueOverrides.hilitecolor;
		} else if (command == "hilitecolor") {
			delete valueOverrides.backcolor;
		}
	}
})();

//@}

/////////////////////////////
///// Common algorithms /////
/////////////////////////////

///// Assorted common algorithms /////
//@{

// Magic array of extra ranges whose endpoints we want to preserve.
var extraRanges = [];

function movePreservingRanges(node, newParent, newIndex) {
	// For convenience, I allow newIndex to be -1 to mean "insert at the end".
	if (newIndex == -1) {
		newIndex = newParent.childNodes.length;
	}

	// "When the user agent is to move a Node to a new location, preserving
	// ranges, it must remove the Node from its original parent (if any), then
	// insert it in the new location. In doing so, however, it must ignore the
	// regular range mutation rules, and instead follow these rules:"

	// "Let node be the moved Node, old parent and old index be the old parent
	// (which may be null) and index, and new parent and new index be the new
	// parent and index."
	var oldParent = node.parentNode;
	var oldIndex = getNodeIndex(node);

	// We preserve the global range object, the ranges in the selection, and
	// any range that's in the extraRanges array.  Any other ranges won't get
	// updated, because we have no references to them.
	var ranges = [globalRange].concat(extraRanges);
	for (var i = 0; i < getSelection().rangeCount; i++) {
		ranges.push(getSelection().getRangeAt(i));
	}
	var boundaryPoints = [];
	ranges.forEach(function(range) {
		boundaryPoints.push([range.startContainer, range.startOffset]);
		boundaryPoints.push([range.endContainer, range.endOffset]);
	});

	boundaryPoints.forEach(function(boundaryPoint) {
		// "If a boundary point's node is the same as or a descendant of node,
		// leave it unchanged, so it moves to the new location."
		//
		// No modifications necessary.

		// "If a boundary point's node is new parent and its offset is greater
		// than new index, add one to its offset."
		if (boundaryPoint[0] == newParent
		&& boundaryPoint[1] > newIndex) {
			boundaryPoint[1]++;
		}

		// "If a boundary point's node is old parent and its offset is old index or
		// old index + 1, set its node to new parent and add new index − old index
		// to its offset."
		if (boundaryPoint[0] == oldParent
		&& (boundaryPoint[1] == oldIndex
		|| boundaryPoint[1] == oldIndex + 1)) {
			boundaryPoint[0] = newParent;
			boundaryPoint[1] += newIndex - oldIndex;
		}

		// "If a boundary point's node is old parent and its offset is greater than
		// old index + 1, subtract one from its offset."
		if (boundaryPoint[0] == oldParent
		&& boundaryPoint[1] > oldIndex + 1) {
			boundaryPoint[1]--;
		}
	});

	// Now actually move it and preserve the ranges.
	if (newParent.childNodes.length == newIndex) {
		newParent.appendChild(node);
	} else {
		newParent.insertBefore(node, newParent.childNodes[newIndex]);
	}

	globalRange.setStart(boundaryPoints[0][0], boundaryPoints[0][1]);
	globalRange.setEnd(boundaryPoints[1][0], boundaryPoints[1][1]);

	for (var i = 0; i < extraRanges.length; i++) {
		extraRanges[i].setStart(boundaryPoints[2*i + 2][0], boundaryPoints[2*i + 2][1]);
		extraRanges[i].setEnd(boundaryPoints[2*i + 3][0], boundaryPoints[2*i + 3][1]);
	}

	getSelection().removeAllRanges();
	for (var i = 1 + extraRanges.length; i < ranges.length; i++) {
		var newRange = document.createRange();
		newRange.setStart(boundaryPoints[2*i][0], boundaryPoints[2*i][1]);
		newRange.setEnd(boundaryPoints[2*i + 1][0], boundaryPoints[2*i + 1][1]);
		getSelection().addRange(newRange);
	}
}

function setTagName(element, newName) {
	// "If element is an HTML element with local name equal to new name, return
	// element."
	if (isHtmlElement(element, newName.toUpperCase())) {
		return element;
	}

	// "If element's parent is null, return element."
	if (!element.parentNode) {
		return element;
	}

	// "Let replacement element be the result of calling createElement(new
	// name) on the ownerDocument of element."
	var replacementElement = element.ownerDocument.createElement(newName);

	// "Insert replacement element into element's parent immediately before
	// element."
	element.parentNode.insertBefore(replacementElement, element);

	// "Copy all attributes of element to replacement element, in order."
	for (var i = 0; i < element.attributes.length; i++) {
		replacementElement.setAttributeNS(element.attributes[i].namespaceURI, element.attributes[i].name, element.attributes[i].value);
	}

	// "While element has children, append the first child of element as the
	// last child of replacement element, preserving ranges."
	while (element.childNodes.length) {
		movePreservingRanges(element.firstChild, replacementElement, replacementElement.childNodes.length);
	}

	// "Remove element from its parent."
	element.parentNode.removeChild(element);

	// "Return replacement element."
	return replacementElement;
}

function removeExtraneousLineBreaksBefore(node) {
	// "Let ref be the previousSibling of node."
	var ref = node.previousSibling;

	// "If ref is null, abort these steps."
	if (!ref) {
		return;
	}

	// "While ref has children, set ref to its lastChild."
	while (ref.hasChildNodes()) {
		ref = ref.lastChild;
	}

	// "While ref is invisible but not an extraneous line break, and ref does
	// not equal node's parent, set ref to the node before it in tree order."
	while (isInvisible(ref)
	&& !isExtraneousLineBreak(ref)
	&& ref != node.parentNode) {
		ref = previousNode(ref);
	}

	// "If ref is an editable extraneous line break, remove it from its
	// parent."
	if (isEditable(ref)
	&& isExtraneousLineBreak(ref)) {
		ref.parentNode.removeChild(ref);
	}
}

function removeExtraneousLineBreaksAtTheEndOf(node) {
	// "Let ref be node."
	var ref = node;

	// "While ref has children, set ref to its lastChild."
	while (ref.hasChildNodes()) {
		ref = ref.lastChild;
	}

	// "While ref is invisible but not an extraneous line break, and ref does
	// not equal node, set ref to the node before it in tree order."
	while (isInvisible(ref)
	&& !isExtraneousLineBreak(ref)
	&& ref != node) {
		ref = previousNode(ref);
	}

	// "If ref is an editable extraneous line break:"
	if (isEditable(ref)
	&& isExtraneousLineBreak(ref)) {
		// "While ref's parent is editable and invisible, set ref to its
		// parent."
		while (isEditable(ref.parentNode)
		&& isInvisible(ref.parentNode)) {
			ref = ref.parentNode;
		}

		// "Remove ref from its parent."
		ref.parentNode.removeChild(ref);
	}
}

// "To remove extraneous line breaks from a node, first remove extraneous line
// breaks before it, then remove extraneous line breaks at the end of it."
function removeExtraneousLineBreaksFrom(node) {
	removeExtraneousLineBreaksBefore(node);
	removeExtraneousLineBreaksAtTheEndOf(node);
}

//@}
///// Wrapping a list of nodes /////
//@{

function wrap(nodeList, siblingCriteria, newParentInstructions) {
	// "If not provided, sibling criteria returns false and new parent
	// instructions returns null."
	if (typeof siblingCriteria == "undefined") {
		siblingCriteria = function() { return false };
	}
	if (typeof newParentInstructions == "undefined") {
		newParentInstructions = function() { return null };
	}

	// "If every member of node list is invisible, and none is a br, return
	// null and abort these steps."
	if (nodeList.every(isInvisible)
	&& !nodeList.some(function(node) { return isHtmlElement(node, "br") })) {
		return null;
	}

	// "If node list's first member's parent is null, return null and abort
	// these steps."
	if (!nodeList[0].parentNode) {
		return null;
	}

	// "If node list's last member is an inline node that's not a br, and node
	// list's last member's nextSibling is a br, append that br to node list."
	if (isInlineNode(nodeList[nodeList.length - 1])
	&& !isHtmlElement(nodeList[nodeList.length - 1], "br")
	&& isHtmlElement(nodeList[nodeList.length - 1].nextSibling, "br")) {
		nodeList.push(nodeList[nodeList.length - 1].nextSibling);
	}

	// "While node list's first member's previousSibling is invisible, prepend
	// it to node list."
	while (isInvisible(nodeList[0].previousSibling)) {
		nodeList.unshift(nodeList[0].previousSibling);
	}

	// "While node list's last member's nextSibling is invisible, append it to
	// node list."
	while (isInvisible(nodeList[nodeList.length - 1].nextSibling)) {
		nodeList.push(nodeList[nodeList.length - 1].nextSibling);
	}

	// "If the previousSibling of the first member of node list is editable and
	// running sibling criteria on it returns true, let new parent be the
	// previousSibling of the first member of node list."
	var newParent;
	if (isEditable(nodeList[0].previousSibling)
	&& siblingCriteria(nodeList[0].previousSibling)) {
		newParent = nodeList[0].previousSibling;

	// "Otherwise, if the nextSibling of the last member of node list is
	// editable and running sibling criteria on it returns true, let new parent
	// be the nextSibling of the last member of node list."
	} else if (isEditable(nodeList[nodeList.length - 1].nextSibling)
	&& siblingCriteria(nodeList[nodeList.length - 1].nextSibling)) {
		newParent = nodeList[nodeList.length - 1].nextSibling;

	// "Otherwise, run new parent instructions, and let new parent be the
	// result."
	} else {
		newParent = newParentInstructions();
	}

	// "If new parent is null, abort these steps and return null."
	if (!newParent) {
		return null;
	}

	// "If new parent's parent is null:"
	if (!newParent.parentNode) {
		// "Insert new parent into the parent of the first member of node list
		// immediately before the first member of node list."
		nodeList[0].parentNode.insertBefore(newParent, nodeList[0]);

		// "If any range has a boundary point with node equal to the parent of
		// new parent and offset equal to the index of new parent, add one to
		// that boundary point's offset."
		//
		// Only try to fix the global range.
		if (globalRange.startContainer == newParent.parentNode
		&& globalRange.startOffset == getNodeIndex(newParent)) {
			globalRange.setStart(globalRange.startContainer, globalRange.startOffset + 1);
		}
		if (globalRange.endContainer == newParent.parentNode
		&& globalRange.endOffset == getNodeIndex(newParent)) {
			globalRange.setEnd(globalRange.endContainer, globalRange.endOffset + 1);
		}
	}

	// "Let original parent be the parent of the first member of node list."
	var originalParent = nodeList[0].parentNode;

	// "If new parent is before the first member of node list in tree order:"
	if (isBefore(newParent, nodeList[0])) {
		// "If new parent is not an inline node, but the last visible child of
		// new parent and the first visible member of node list are both inline
		// nodes, and the last child of new parent is not a br, call
		// createElement("br") on the ownerDocument of new parent and append
		// the result as the last child of new parent."
		if (!isInlineNode(newParent)
		&& isInlineNode([].filter.call(newParent.childNodes, isVisible).slice(-1)[0])
		&& isInlineNode(nodeList.filter(isVisible)[0])
		&& !isHtmlElement(newParent.lastChild, "BR")) {
			newParent.appendChild(newParent.ownerDocument.createElement("br"));
		}

		// "For each node in node list, append node as the last child of new
		// parent, preserving ranges."
		for (var i = 0; i < nodeList.length; i++) {
			movePreservingRanges(nodeList[i], newParent, -1);
		}

	// "Otherwise:"
	} else {
		// "If new parent is not an inline node, but the first visible child of
		// new parent and the last visible member of node list are both inline
		// nodes, and the last member of node list is not a br, call
		// createElement("br") on the ownerDocument of new parent and insert
		// the result as the first child of new parent."
		if (!isInlineNode(newParent)
		&& isInlineNode([].filter.call(newParent.childNodes, isVisible)[0])
		&& isInlineNode(nodeList.filter(isVisible).slice(-1)[0])
		&& !isHtmlElement(nodeList[nodeList.length - 1], "BR")) {
			newParent.insertBefore(newParent.ownerDocument.createElement("br"), newParent.firstChild);
		}

		// "For each node in node list, in reverse order, insert node as the
		// first child of new parent, preserving ranges."
		for (var i = nodeList.length - 1; i >= 0; i--) {
			movePreservingRanges(nodeList[i], newParent, 0);
		}
	}

	// "If original parent is editable and has no children, remove it from its
	// parent."
	if (isEditable(originalParent) && !originalParent.hasChildNodes()) {
		originalParent.parentNode.removeChild(originalParent);
	}

	// "If new parent's nextSibling is editable and running sibling criteria on
	// it returns true:"
	if (isEditable(newParent.nextSibling)
	&& siblingCriteria(newParent.nextSibling)) {
		// "If new parent is not an inline node, but new parent's last child
		// and new parent's nextSibling's first child are both inline nodes,
		// and new parent's last child is not a br, call createElement("br") on
		// the ownerDocument of new parent and append the result as the last
		// child of new parent."
		if (!isInlineNode(newParent)
		&& isInlineNode(newParent.lastChild)
		&& isInlineNode(newParent.nextSibling.firstChild)
		&& !isHtmlElement(newParent.lastChild, "BR")) {
			newParent.appendChild(newParent.ownerDocument.createElement("br"));
		}

		// "While new parent's nextSibling has children, append its first child
		// as the last child of new parent, preserving ranges."
		while (newParent.nextSibling.hasChildNodes()) {
			movePreservingRanges(newParent.nextSibling.firstChild, newParent, -1);
		}

		// "Remove new parent's nextSibling from its parent."
		newParent.parentNode.removeChild(newParent.nextSibling);
	}

	// "Remove extraneous line breaks from new parent."
	removeExtraneousLineBreaksFrom(newParent);

	// "Return new parent."
	return newParent;
}


//@}
///// Allowed children /////
//@{

// "A name of an element with inline contents is "a", "abbr", "b", "bdi",
// "bdo", "cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
// "kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
// "span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
// "xmp", "big", "blink", "font", "marquee", "nobr", or "tt"."
var namesOfElementsWithInlineContents = ["a", "abbr", "b", "bdi", "bdo",
	"cite", "code", "dfn", "em", "h1", "h2", "h3", "h4", "h5", "h6", "i",
	"kbd", "mark", "p", "pre", "q", "rp", "rt", "ruby", "s", "samp", "small",
	"span", "strong", "sub", "sup", "u", "var", "acronym", "listing", "strike",
	"xmp", "big", "blink", "font", "marquee", "nobr", "tt"];

// "An element with inline contents is an HTML element whose local name is a
// name of an element with inline contents."
function isElementWithInlineContents(node) {
	return isHtmlElement(node, namesOfElementsWithInlineContents);
}

function isAllowedChild(child, parent_) {
	// "If parent is "colgroup", "table", "tbody", "tfoot", "thead", "tr", or
	// an HTML element with local name equal to one of those, and child is a
	// Text node whose data does not consist solely of space characters, return
	// false."
	if ((["colgroup", "table", "tbody", "tfoot", "thead", "tr"].indexOf(parent_) != -1
	|| isHtmlElement(parent_, ["colgroup", "table", "tbody", "tfoot", "thead", "tr"]))
	&& typeof child == "object"
	&& child.nodeType == Node.TEXT_NODE
	&& !/^[ \t\n\f\r]*$/.test(child.data)) {
		return false;
	}

	// "If parent is "script", "style", "plaintext", or "xmp", or an HTML
	// element with local name equal to one of those, and child is not a Text
	// node, return false."
	if ((["script", "style", "plaintext", "xmp"].indexOf(parent_) != -1
	|| isHtmlElement(parent_, ["script", "style", "plaintext", "xmp"]))
	&& (typeof child != "object" || child.nodeType != Node.TEXT_NODE)) {
		return false;
	}

	// "If child is a Document, DocumentFragment, or DocumentType, return
	// false."
	if (typeof child == "object"
	&& (child.nodeType == Node.DOCUMENT_NODE
	|| child.nodeType == Node.DOCUMENT_FRAGMENT_NODE
	|| child.nodeType == Node.DOCUMENT_TYPE_NODE)) {
		return false;
	}

	// "If child is an HTML element, set child to the local name of child."
	if (isHtmlElement(child)) {
		child = child.tagName.toLowerCase();
	}

	// "If child is not a string, return true."
	if (typeof child != "string") {
		return true;
	}

	// "If parent is an HTML element:"
	if (isHtmlElement(parent_)) {
		// "If child is "a", and parent or some ancestor of parent is an a,
		// return false."
		//
		// "If child is a prohibited paragraph child name and parent or some
		// ancestor of parent is an element with inline contents, return
		// false."
		//
		// "If child is "h1", "h2", "h3", "h4", "h5", or "h6", and parent or
		// some ancestor of parent is an HTML element with local name "h1",
		// "h2", "h3", "h4", "h5", or "h6", return false."
		var ancestor = parent_;
		while (ancestor) {
			if (child == "a" && isHtmlElement(ancestor, "a")) {
				return false;
			}
			if (prohibitedParagraphChildNames.indexOf(child) != -1
			&& isElementWithInlineContents(ancestor)) {
				return false;
			}
			if (/^h[1-6]$/.test(child)
			&& isHtmlElement(ancestor)
			&& /^H[1-6]$/.test(ancestor.tagName)) {
				return false;
			}
			ancestor = ancestor.parentNode;
		}

		// "Let parent be the local name of parent."
		parent_ = parent_.tagName.toLowerCase();
	}

	// "If parent is an Element or DocumentFragment, return true."
	if (typeof parent_ == "object"
	&& (parent_.nodeType == Node.ELEMENT_NODE
	|| parent_.nodeType == Node.DOCUMENT_FRAGMENT_NODE)) {
		return true;
	}

	// "If parent is not a string, return false."
	if (typeof parent_ != "string") {
		return false;
	}

	// "If parent is on the left-hand side of an entry on the following list,
	// then return true if child is listed on the right-hand side of that
	// entry, and false otherwise."
	switch (parent_) {
		case "colgroup":
			return child == "col";
		case "table":
			return ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1;
		case "tbody":
		case "thead":
		case "tfoot":
			return ["td", "th", "tr"].indexOf(child) != -1;
		case "tr":
			return ["td", "th"].indexOf(child) != -1;
		case "dl":
			return ["dt", "dd"].indexOf(child) != -1;
		case "dir":
		case "ol":
		case "ul":
			return ["dir", "li", "ol", "ul"].indexOf(child) != -1;
		case "hgroup":
			return /^h[1-6]$/.test(child);
	}

	// "If child is "body", "caption", "col", "colgroup", "frame", "frameset",
	// "head", "html", "tbody", "td", "tfoot", "th", "thead", or "tr", return
	// false."
	if (["body", "caption", "col", "colgroup", "frame", "frameset", "head",
	"html", "tbody", "td", "tfoot", "th", "thead", "tr"].indexOf(child) != -1) {
		return false;
	}

	// "If child is "dd" or "dt" and parent is not "dl", return false."
	if (["dd", "dt"].indexOf(child) != -1
	&& parent_ != "dl") {
		return false;
	}

	// "If child is "li" and parent is not "ol" or "ul", return false."
	if (child == "li"
	&& parent_ != "ol"
	&& parent_ != "ul") {
		return false;
	}

	// "If parent is on the left-hand side of an entry on the following list
	// and child is listed on the right-hand side of that entry, return false."
	var table = [
		[["a"], ["a"]],
		[["dd", "dt"], ["dd", "dt"]],
		[["h1", "h2", "h3", "h4", "h5", "h6"], ["h1", "h2", "h3", "h4", "h5", "h6"]],
		[["li"], ["li"]],
		[["nobr"], ["nobr"]],
		[namesOfElementsWithInlineContents, prohibitedParagraphChildNames],
		[["td", "th"], ["caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"]],
	];
	for (var i = 0; i < table.length; i++) {
		if (table[i][0].indexOf(parent_) != -1
		&& table[i][1].indexOf(child) != -1) {
			return false;
		}
	}

	// "Return true."
	return true;
}


//@}

//////////////////////////////////////
///// Inline formatting commands /////
//////////////////////////////////////

///// Inline formatting command definitions /////
//@{

// "A node node is effectively contained in a range range if range is not
// collapsed, and at least one of the following holds:"
function isEffectivelyContained(node, range) {
	if (range.collapsed) {
		return false;
	}

	// "node is contained in range."
	if (isContained(node, range)) {
		return true;
	}

	// "node is range's start node, it is a Text node, and its length is
	// different from range's start offset."
	if (node == range.startContainer
	&& node.nodeType == Node.TEXT_NODE
	&& getNodeLength(node) != range.startOffset) {
		return true;
	}

	// "node is range's end node, it is a Text node, and range's end offset is
	// not 0."
	if (node == range.endContainer
	&& node.nodeType == Node.TEXT_NODE
	&& range.endOffset != 0) {
		return true;
	}

	// "node has at least one child; and all its children are effectively
	// contained in range; and either range's start node is not a descendant of
	// node or is not a Text node or range's start offset is zero; and either
	// range's end node is not a descendant of node or is not a Text node or
	// range's end offset is its end node's length."
	if (node.hasChildNodes()
	&& [].every.call(node.childNodes, function(child) { return isEffectivelyContained(child, range) })
	&& (!isDescendant(range.startContainer, node)
	|| range.startContainer.nodeType != Node.TEXT_NODE
	|| range.startOffset == 0)
	&& (!isDescendant(range.endContainer, node)
	|| range.endContainer.nodeType != Node.TEXT_NODE
	|| range.endOffset == getNodeLength(range.endContainer))) {
		return true;
	}

	return false;
}

// Like get(All)ContainedNodes(), but for effectively contained nodes.
function getEffectivelyContainedNodes(range, condition) {
	if (typeof condition == "undefined") {
		condition = function() { return true };
	}
	var node = range.startContainer;
	while (isEffectivelyContained(node.parentNode, range)) {
		node = node.parentNode;
	}

	var stop = nextNodeDescendants(range.endContainer);

	var nodeList = [];
	while (isBefore(node, stop)) {
		if (isEffectivelyContained(node, range)
		&& condition(node)) {
			nodeList.push(node);
			node = nextNodeDescendants(node);
			continue;
		}
		node = nextNode(node);
	}
	return nodeList;
}

function getAllEffectivelyContainedNodes(range, condition) {
	if (typeof condition == "undefined") {
		condition = function() { return true };
	}
	var node = range.startContainer;
	while (isEffectivelyContained(node.parentNode, range)) {
		node = node.parentNode;
	}

	var stop = nextNodeDescendants(range.endContainer);

	var nodeList = [];
	while (isBefore(node, stop)) {
		if (isEffectivelyContained(node, range)
		&& condition(node)) {
			nodeList.push(node);
		}
		node = nextNode(node);
	}
	return nodeList;
}

// "A modifiable element is a b, em, i, s, span, strong, sub, sup, or u element
// with no attributes except possibly style; or a font element with no
// attributes except possibly style, color, face, and/or size; or an a element
// with no attributes except possibly style and/or href."
function isModifiableElement(node) {
	if (!isHtmlElement(node)) {
		return false;
	}

	if (["B", "EM", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) != -1) {
		if (node.attributes.length == 0) {
			return true;
		}

		if (node.attributes.length == 1
		&& node.hasAttribute("style")) {
			return true;
		}
	}

	if (node.tagName == "FONT" || node.tagName == "A") {
		var numAttrs = node.attributes.length;

		if (node.hasAttribute("style")) {
			numAttrs--;
		}

		if (node.tagName == "FONT") {
			if (node.hasAttribute("color")) {
				numAttrs--;
			}

			if (node.hasAttribute("face")) {
				numAttrs--;
			}

			if (node.hasAttribute("size")) {
				numAttrs--;
			}
		}

		if (node.tagName == "A"
		&& node.hasAttribute("href")) {
			numAttrs--;
		}

		if (numAttrs == 0) {
			return true;
		}
	}

	return false;
}

function isSimpleModifiableElement(node) {
	// "A simple modifiable element is an HTML element for which at least one
	// of the following holds:"
	if (!isHtmlElement(node)) {
		return false;
	}

	// Only these elements can possibly be a simple modifiable element.
	if (["A", "B", "EM", "FONT", "I", "S", "SPAN", "STRIKE", "STRONG", "SUB", "SUP", "U"].indexOf(node.tagName) == -1) {
		return false;
	}

	// "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
	// element with no attributes."
	if (node.attributes.length == 0) {
		return true;
	}

	// If it's got more than one attribute, everything after this fails.
	if (node.attributes.length > 1) {
		return false;
	}

	// "It is an a, b, em, font, i, s, span, strike, strong, sub, sup, or u
	// element with exactly one attribute, which is style, which sets no CSS
	// properties (including invalid or unrecognized properties)."
	//
	// Not gonna try for invalid or unrecognized.
	if (node.hasAttribute("style")
	&& node.style.length == 0) {
		return true;
	}

	// "It is an a element with exactly one attribute, which is href."
	if (node.tagName == "A"
	&& node.hasAttribute("href")) {
		return true;
	}

	// "It is a font element with exactly one attribute, which is either color,
	// face, or size."
	if (node.tagName == "FONT"
	&& (node.hasAttribute("color")
	|| node.hasAttribute("face")
	|| node.hasAttribute("size")
	)) {
		return true;
	}

	// "It is a b or strong element with exactly one attribute, which is style,
	// and the style attribute sets exactly one CSS property (including invalid
	// or unrecognized properties), which is "font-weight"."
	if ((node.tagName == "B" || node.tagName == "STRONG")
	&& node.hasAttribute("style")
	&& node.style.length == 1
	&& node.style.fontWeight != "") {
		return true;
	}

	// "It is an i or em element with exactly one attribute, which is style,
	// and the style attribute sets exactly one CSS property (including invalid
	// or unrecognized properties), which is "font-style"."
	if ((node.tagName == "I" || node.tagName == "EM")
	&& node.hasAttribute("style")
	&& node.style.length == 1
	&& node.style.fontStyle != "") {
		return true;
	}

	// "It is an a, font, or span element with exactly one attribute, which is
	// style, and the style attribute sets exactly one CSS property (including
	// invalid or unrecognized properties), and that property is not
	// "text-decoration"."
	if ((node.tagName == "A" || node.tagName == "FONT" || node.tagName == "SPAN")
	&& node.hasAttribute("style")
	&& node.style.length == 1
	&& node.style.textDecoration == "") {
		return true;
	}

	// "It is an a, font, s, span, strike, or u element with exactly one
	// attribute, which is style, and the style attribute sets exactly one CSS
	// property (including invalid or unrecognized properties), which is
	// "text-decoration", which is set to "line-through" or "underline" or
	// "overline" or "none"."
	//
	// The weird extra node.style.length check is for Firefox, which as of
	// 8.0a2 has annoying and weird behavior here.
	if (["A", "FONT", "S", "SPAN", "STRIKE", "U"].indexOf(node.tagName) != -1
	&& node.hasAttribute("style")
	&& (node.style.length == 1
	|| (node.style.length == 4
		&& "MozTextBlink" in node.style
		&& "MozTextDecorationColor" in node.style
		&& "MozTextDecorationLine" in node.style
		&& "MozTextDecorationStyle" in node.style)
	)
	&& (node.style.textDecoration == "line-through"
	|| node.style.textDecoration == "underline"
	|| node.style.textDecoration == "overline"
	|| node.style.textDecoration == "none")) {
		return true;
	}

	return false;
}

// "A formattable node is an editable visible node that is either a Text node,
// an img, or a br."
function isFormattableNode(node) {
	return isEditable(node)
		&& isVisible(node)
		&& (node.nodeType == Node.TEXT_NODE
		|| isHtmlElement(node, ["img", "br"]));
}

// "Two quantities are equivalent values for a command if either both are null,
// or both are strings and they're equal and the command does not define any
// equivalent values, or both are strings and the command defines equivalent
// values and they match the definition."
function areEquivalentValues(command, val1, val2) {
	if (val1 === null && val2 === null) {
		return true;
	}

	if (typeof val1 == "string"
	&& typeof val2 == "string"
	&& val1 == val2
	&& !("equivalentValues" in commands[command])) {
		return true;
	}

	if (typeof val1 == "string"
	&& typeof val2 == "string"
	&& "equivalentValues" in commands[command]
	&& commands[command].equivalentValues(val1, val2)) {
		return true;
	}

	return false;
}

// "Two quantities are loosely equivalent values for a command if either they
// are equivalent values for the command, or if the command is the fontSize
// command; one of the quantities is one of "x-small", "small", "medium",
// "large", "x-large", "xx-large", or "xxx-large"; and the other quantity is
// the resolved value of "font-size" on a font element whose size attribute has
// the corresponding value set ("1" through "7" respectively)."
function areLooselyEquivalentValues(command, val1, val2) {
	if (areEquivalentValues(command, val1, val2)) {
		return true;
	}

	if (command != "fontsize"
	|| typeof val1 != "string"
	|| typeof val2 != "string") {
		return false;
	}

	// Static variables in JavaScript?
	var callee = areLooselyEquivalentValues;
	if (callee.sizeMap === undefined) {
		callee.sizeMap = {};
		var font = document.createElement("font");
		document.body.appendChild(font);
		["x-small", "small", "medium", "large", "x-large", "xx-large",
		"xxx-large"].forEach(function(keyword) {
			font.size = cssSizeToLegacy(keyword);
			callee.sizeMap[keyword] = getComputedStyle(font).fontSize;
		});
		document.body.removeChild(font);
	}

	return val1 === callee.sizeMap[val2]
		|| val2 === callee.sizeMap[val1];
}

//@}
///// Assorted inline formatting command algorithms /////
//@{

function getEffectiveCommandValue(node, command) {
	// "If neither node nor its parent is an Element, return null."
	if (node.nodeType != Node.ELEMENT_NODE
	&& (!node.parentNode || node.parentNode.nodeType != Node.ELEMENT_NODE)) {
		return null;
	}

	// "If node is not an Element, return the effective command value of its
	// parent for command."
	if (node.nodeType != Node.ELEMENT_NODE) {
		return getEffectiveCommandValue(node.parentNode, command);
	}

	// "If command is "createLink" or "unlink":"
	if (command == "createlink" || command == "unlink") {
		// "While node is not null, and is not an a element that has an href
		// attribute, set node to its parent."
		while (node
		&& (!isHtmlElement(node)
		|| node.tagName != "A"
		|| !node.hasAttribute("href"))) {
			node = node.parentNode;
		}

		// "If node is null, return null."
		if (!node) {
			return null;
		}

		// "Return the value of node's href attribute."
		return node.getAttribute("href");
	}

	// "If command is "backColor" or "hiliteColor":"
	if (command == "backcolor"
	|| command == "hilitecolor") {
		// "While the resolved value of "background-color" on node is any
		// fully transparent value, and node's parent is an Element, set
		// node to its parent."
		//
		// Another lame hack to avoid flawed APIs.
		while ((getComputedStyle(node).backgroundColor == "rgba(0, 0, 0, 0)"
		|| getComputedStyle(node).backgroundColor === ""
		|| getComputedStyle(node).backgroundColor == "transparent")
		&& node.parentNode
		&& node.parentNode.nodeType == Node.ELEMENT_NODE) {
			node = node.parentNode;
		}

		// "Return the resolved value of "background-color" for node."
		return getComputedStyle(node).backgroundColor;
	}

	// "If command is "subscript" or "superscript":"
	if (command == "subscript" || command == "superscript") {
		// "Let affected by subscript and affected by superscript be two
		// boolean variables, both initially false."
		var affectedBySubscript = false;
		var affectedBySuperscript = false;

		// "While node is an inline node:"
		while (isInlineNode(node)) {
			var verticalAlign = getComputedStyle(node).verticalAlign;

			// "If node is a sub, set affected by subscript to true."
			if (isHtmlElement(node, "sub")) {
				affectedBySubscript = true;
			// "Otherwise, if node is a sup, set affected by superscript to
			// true."
			} else if (isHtmlElement(node, "sup")) {
				affectedBySuperscript = true;
			}

			// "Set node to its parent."
			node = node.parentNode;
		}

		// "If affected by subscript and affected by superscript are both true,
		// return the string "mixed"."
		if (affectedBySubscript && affectedBySuperscript) {
			return "mixed";
		}

		// "If affected by subscript is true, return "subscript"."
		if (affectedBySubscript) {
			return "subscript";
		}

		// "If affected by superscript is true, return "superscript"."
		if (affectedBySuperscript) {
			return "superscript";
		}

		// "Return null."
		return null;
	}

	// "If command is "strikethrough", and the "text-decoration" property of
	// node or any of its ancestors has resolved value containing
	// "line-through", return "line-through". Otherwise, return null."
	if (command == "strikethrough") {
		do {
			if (getComputedStyle(node).textDecoration.indexOf("line-through") != -1) {
				return "line-through";
			}
			node = node.parentNode;
		} while (node && node.nodeType == Node.ELEMENT_NODE);
		return null;
	}

	// "If command is "underline", and the "text-decoration" property of node
	// or any of its ancestors has resolved value containing "underline",
	// return "underline". Otherwise, return null."
	if (command == "underline") {
		do {
			if (getComputedStyle(node).textDecoration.indexOf("underline") != -1) {
				return "underline";
			}
			node = node.parentNode;
		} while (node && node.nodeType == Node.ELEMENT_NODE);
		return null;
	}

	if (!("relevantCssProperty" in commands[command])) {
		throw "Bug: no relevantCssProperty for " + command + " in getEffectiveCommandValue";
	}

	// "Return the resolved value for node of the relevant CSS property for
	// command."
	return getComputedStyle(node)[commands[command].relevantCssProperty];
}

function getSpecifiedCommandValue(element, command) {
	// "If command is "backColor" or "hiliteColor" and element's display
	// property does not have resolved value "inline", return null."
	if ((command == "backcolor" || command == "hilitecolor")
	&& getComputedStyle(element).display != "inline") {
		return null;
	}

	// "If command is "createLink" or "unlink":"
	if (command == "createlink" || command == "unlink") {
		// "If element is an a element and has an href attribute, return the
		// value of that attribute."
		if (isHtmlElement(element)
		&& element.tagName == "A"
		&& element.hasAttribute("href")) {
			return element.getAttribute("href");
		}

		// "Return null."
		return null;
	}

	// "If command is "subscript" or "superscript":"
	if (command == "subscript" || command == "superscript") {
		// "If element is a sup, return "superscript"."
		if (isHtmlElement(element, "sup")) {
			return "superscript";
		}

		// "If element is a sub, return "subscript"."
		if (isHtmlElement(element, "sub")) {
			return "subscript";
		}

		// "Return null."
		return null;
	}

	// "If command is "strikethrough", and element has a style attribute set,
	// and that attribute sets "text-decoration":"
	if (command == "strikethrough"
	&& element.style.textDecoration != "") {
		// "If element's style attribute sets "text-decoration" to a value
		// containing "line-through", return "line-through"."
		if (element.style.textDecoration.indexOf("line-through") != -1) {
			return "line-through";
		}

		// "Return null."
		return null;
	}

	// "If command is "strikethrough" and element is a s or strike element,
	// return "line-through"."
	if (command == "strikethrough"
	&& isHtmlElement(element, ["S", "STRIKE"])) {
		return "line-through";
	}

	// "If command is "underline", and element has a style attribute set, and
	// that attribute sets "text-decoration":"
	if (command == "underline"
	&& element.style.textDecoration != "") {
		// "If element's style attribute sets "text-decoration" to a value
		// containing "underline", return "underline"."
		if (element.style.textDecoration.indexOf("underline") != -1) {
			return "underline";
		}

		// "Return null."
		return null;
	}

	// "If command is "underline" and element is a u element, return
	// "underline"."
	if (command == "underline"
	&& isHtmlElement(element, "U")) {
		return "underline";
	}

	// "Let property be the relevant CSS property for command."
	var property = commands[command].relevantCssProperty;

	// "If property is null, return null."
	if (property === null) {
		return null;
	}

	// "If element has a style attribute set, and that attribute has the
	// effect of setting property, return the value that it sets property to."
	if (element.style[property] != "") {
		return element.style[property];
	}

	// "If element is a font element that has an attribute whose effect is
	// to create a presentational hint for property, return the value that the
	// hint sets property to.  (For a size of 7, this will be the non-CSS value
	// "xxx-large".)"
	if (isHtmlNamespace(element.namespaceURI)
	&& element.tagName == "FONT") {
		if (property == "color" && element.hasAttribute("color")) {
			return element.color;
		}
		if (property == "fontFamily" && element.hasAttribute("face")) {
			return element.face;
		}
		if (property == "fontSize" && element.hasAttribute("size")) {
			// This is not even close to correct in general.
			var size = parseInt(element.size);
			if (size < 1) {
				size = 1;
			}
			if (size > 7) {
				size = 7;
			}
			return {
				1: "x-small",
				2: "small",
				3: "medium",
				4: "large",
				5: "x-large",
				6: "xx-large",
				7: "xxx-large"
			}[size];
		}
	}

	// "If element is in the following list, and property is equal to the
	// CSS property name listed for it, return the string listed for it."
	//
	// A list follows, whose meaning is copied here.
	if (property == "fontWeight"
	&& (element.tagName == "B" || element.tagName == "STRONG")) {
		return "bold";
	}
	if (property == "fontStyle"
	&& (element.tagName == "I" || element.tagName == "EM")) {
		return "italic";
	}

	// "Return null."
	return null;
}

function reorderModifiableDescendants(node, command, newValue) {
	// "Let candidate equal node."
	var candidate = node;

	// "While candidate is a modifiable element, and candidate has exactly one
	// child, and that child is also a modifiable element, and candidate is not
	// a simple modifiable element or candidate's specified command value for
	// command is not equivalent to new value, set candidate to its child."
	while (isModifiableElement(candidate)
	&& candidate.childNodes.length == 1
	&& isModifiableElement(candidate.firstChild)
	&& (!isSimpleModifiableElement(candidate)
	|| !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue))) {
		candidate = candidate.firstChild;
	}

	// "If candidate is node, or is not a simple modifiable element, or its
	// specified command value is not equivalent to new value, or its effective
	// command value is not loosely equivalent to new value, abort these
	// steps."
	if (candidate == node
	|| !isSimpleModifiableElement(candidate)
	|| !areEquivalentValues(command, getSpecifiedCommandValue(candidate, command), newValue)
	|| !areLooselyEquivalentValues(command, getEffectiveCommandValue(candidate, command), newValue)) {
		return;
	}

	// "While candidate has children, insert the first child of candidate into
	// candidate's parent immediately before candidate, preserving ranges."
	while (candidate.hasChildNodes()) {
		movePreservingRanges(candidate.firstChild, candidate.parentNode, getNodeIndex(candidate));
	}

	// "Insert candidate into node's parent immediately after node."
	node.parentNode.insertBefore(candidate, node.nextSibling);

	// "Append the node as the last child of candidate, preserving ranges."
	movePreservingRanges(node, candidate, -1);
}

function recordValues(nodeList) {
	// "Let values be a list of (node, command, specified command value)
	// triples, initially empty."
	var values = [];

	// "For each node in node list, for each command in the list "subscript",
	// "bold", "fontName", "fontSize", "foreColor", "hiliteColor", "italic",
	// "strikethrough", and "underline" in that order:"
	nodeList.forEach(function(node) {
		["subscript", "bold", "fontname", "fontsize", "forecolor",
		"hilitecolor", "italic", "strikethrough", "underline"].forEach(function(command) {
			// "Let ancestor equal node."
			var ancestor = node;

			// "If ancestor is not an Element, set it to its parent."
			if (ancestor.nodeType != Node.ELEMENT_NODE) {
				ancestor = ancestor.parentNode;
			}

			// "While ancestor is an Element and its specified command value
			// for command is null, set it to its parent."
			while (ancestor
			&& ancestor.nodeType == Node.ELEMENT_NODE
			&& getSpecifiedCommandValue(ancestor, command) === null) {
				ancestor = ancestor.parentNode;
			}

			// "If ancestor is an Element, add (node, command, ancestor's
			// specified command value for command) to values. Otherwise add
			// (node, command, null) to values."
			if (ancestor && ancestor.nodeType == Node.ELEMENT_NODE) {
				values.push([node, command, getSpecifiedCommandValue(ancestor, command)]);
			} else {
				values.push([node, command, null]);
			}
		});
	});

	// "Return values."
	return values;
}

function restoreValues(values) {
	// "For each (node, command, value) triple in values:"
	values.forEach(function(triple) {
		var node = triple[0];
		var command = triple[1];
		var value = triple[2];

		// "Let ancestor equal node."
		var ancestor = node;

		// "If ancestor is not an Element, set it to its parent."
		if (!ancestor || ancestor.nodeType != Node.ELEMENT_NODE) {
			ancestor = ancestor.parentNode;
		}

		// "While ancestor is an Element and its specified command value for
		// command is null, set it to its parent."
		while (ancestor
		&& ancestor.nodeType == Node.ELEMENT_NODE
		&& getSpecifiedCommandValue(ancestor, command) === null) {
			ancestor = ancestor.parentNode;
		}

		// "If value is null and ancestor is an Element, push down values on
		// node for command, with new value null."
		if (value === null
		&& ancestor
		&& ancestor.nodeType == Node.ELEMENT_NODE) {
			pushDownValues(node, command, null);

		// "Otherwise, if ancestor is an Element and its specified command
		// value for command is not equivalent to value, or if ancestor is not
		// an Element and value is not null, force the value of command to
		// value on node."
		} else if ((ancestor
		&& ancestor.nodeType == Node.ELEMENT_NODE
		&& !areEquivalentValues(command, getSpecifiedCommandValue(ancestor, command), value))
		|| ((!ancestor || ancestor.nodeType != Node.ELEMENT_NODE)
		&& value !== null)) {
			forceValue(node, command, value);
		}
	});
}


//@}
///// Clearing an element's value /////
//@{

function clearValue(element, command) {
	// "If element is not editable, return the empty list."
	if (!isEditable(element)) {
		return [];
	}

	// "If element's specified command value for command is null, return the
	// empty list."
	if (getSpecifiedCommandValue(element, command) === null) {
		return [];
	}

	// "If element is a simple modifiable element:"
	if (isSimpleModifiableElement(element)) {
		// "Let children be the children of element."
		var children = Array.prototype.slice.call(element.childNodes);

		// "For each child in children, insert child into element's parent
		// immediately before element, preserving ranges."
		for (var i = 0; i < children.length; i++) {
			movePreservingRanges(children[i], element.parentNode, getNodeIndex(element));
		}

		// "Remove element from its parent."
		element.parentNode.removeChild(element);

		// "Return children."
		return children;
	}

	// "If command is "strikethrough", and element has a style attribute that
	// sets "text-decoration" to some value containing "line-through", delete
	// "line-through" from the value."
	if (command == "strikethrough"
	&& element.style.textDecoration.indexOf("line-through") != -1) {
		if (element.style.textDecoration == "line-through") {
			element.style.textDecoration = "";
		} else {
			element.style.textDecoration = element.style.textDecoration.replace("line-through", "");
		}
		if (element.getAttribute("style") == "") {
			element.removeAttribute("style");
		}
	}

	// "If command is "underline", and element has a style attribute that sets
	// "text-decoration" to some value containing "underline", delete
	// "underline" from the value."
	if (command == "underline"
	&& element.style.textDecoration.indexOf("underline") != -1) {
		if (element.style.textDecoration == "underline") {
			element.style.textDecoration = "";
		} else {
			element.style.textDecoration = element.style.textDecoration.replace("underline", "");
		}
		if (element.getAttribute("style") == "") {
			element.removeAttribute("style");
		}
	}

	// "If the relevant CSS property for command is not null, unset the CSS
	// property property of element."
	if (commands[command].relevantCssProperty !== null) {
		element.style[commands[command].relevantCssProperty] = '';
		if (element.getAttribute("style") == "") {
			element.removeAttribute("style");
		}
	}

	// "If element is a font element:"
	if (isHtmlNamespace(element.namespaceURI) && element.tagName == "FONT") {
		// "If command is "foreColor", unset element's color attribute, if set."
		if (command == "forecolor") {
			element.removeAttribute("color");
		}

		// "If command is "fontName", unset element's face attribute, if set."
		if (command == "fontname") {
			element.removeAttribute("face");
		}

		// "If command is "fontSize", unset element's size attribute, if set."
		if (command == "fontsize") {
			element.removeAttribute("size");
		}
	}

	// "If element is an a element and command is "createLink" or "unlink",
	// unset the href property of element."
	if (isHtmlElement(element, "A")
	&& (command == "createlink" || command == "unlink")) {
		element.removeAttribute("href");
	}

	// "If element's specified command value for command is null, return the
	// empty list."
	if (getSpecifiedCommandValue(element, command) === null) {
		return [];
	}

	// "Set the tag name of element to "span", and return the one-node list
	// consisting of the result."
	return [setTagName(element, "span")];
}


//@}
///// Pushing down values /////
//@{

function pushDownValues(node, command, newValue) {
	// "If node's parent is not an Element, abort this algorithm."
	if (!node.parentNode
	|| node.parentNode.nodeType != Node.ELEMENT_NODE) {
		return;
	}

	// "If the effective command value of command is loosely equivalent to new
	// value on node, abort this algorithm."
	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
		return;
	}

	// "Let current ancestor be node's parent."
	var currentAncestor = node.parentNode;

	// "Let ancestor list be a list of Nodes, initially empty."
	var ancestorList = [];

	// "While current ancestor is an editable Element and the effective command
	// value of command is not loosely equivalent to new value on it, append
	// current ancestor to ancestor list, then set current ancestor to its
	// parent."
	while (isEditable(currentAncestor)
	&& currentAncestor.nodeType == Node.ELEMENT_NODE
	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(currentAncestor, command), newValue)) {
		ancestorList.push(currentAncestor);
		currentAncestor = currentAncestor.parentNode;
	}

	// "If ancestor list is empty, abort this algorithm."
	if (!ancestorList.length) {
		return;
	}

	// "Let propagated value be the specified command value of command on the
	// last member of ancestor list."
	var propagatedValue = getSpecifiedCommandValue(ancestorList[ancestorList.length - 1], command);

	// "If propagated value is null and is not equal to new value, abort this
	// algorithm."
	if (propagatedValue === null && propagatedValue != newValue) {
		return;
	}

	// "If the effective command value for the parent of the last member of
	// ancestor list is not loosely equivalent to new value, and new value is
	// not null, abort this algorithm."
	if (newValue !== null
	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(ancestorList[ancestorList.length - 1].parentNode, command), newValue)) {
		return;
	}

	// "While ancestor list is not empty:"
	while (ancestorList.length) {
		// "Let current ancestor be the last member of ancestor list."
		// "Remove the last member from ancestor list."
		var currentAncestor = ancestorList.pop();

		// "If the specified command value of current ancestor for command is
		// not null, set propagated value to that value."
		if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
			propagatedValue = getSpecifiedCommandValue(currentAncestor, command);
		}

		// "Let children be the children of current ancestor."
		var children = Array.prototype.slice.call(currentAncestor.childNodes);

		// "If the specified command value of current ancestor for command is
		// not null, clear the value of current ancestor."
		if (getSpecifiedCommandValue(currentAncestor, command) !== null) {
			clearValue(currentAncestor, command);
		}

		// "For every child in children:"
		for (var i = 0; i < children.length; i++) {
			var child = children[i];

			// "If child is node, continue with the next child."
			if (child == node) {
				continue;
			}

			// "If child is an Element whose specified command value for
			// command is neither null nor equivalent to propagated value,
			// continue with the next child."
			if (child.nodeType == Node.ELEMENT_NODE
			&& getSpecifiedCommandValue(child, command) !== null
			&& !areEquivalentValues(command, propagatedValue, getSpecifiedCommandValue(child, command))) {
				continue;
			}

			// "If child is the last member of ancestor list, continue with the
			// next child."
			if (child == ancestorList[ancestorList.length - 1]) {
				continue;
			}

			// "Force the value of child, with command as in this algorithm
			// and new value equal to propagated value."
			forceValue(child, command, propagatedValue);
		}
	}
}


//@}
///// Forcing the value of a node /////
//@{

function forceValue(node, command, newValue) {
	// "If node's parent is null, abort this algorithm."
	if (!node.parentNode) {
		return;
	}

	// "If new value is null, abort this algorithm."
	if (newValue === null) {
		return;
	}

	// "If node is an allowed child of "span":"
	if (isAllowedChild(node, "span")) {
		// "Reorder modifiable descendants of node's previousSibling."
		reorderModifiableDescendants(node.previousSibling, command, newValue);

		// "Reorder modifiable descendants of node's nextSibling."
		reorderModifiableDescendants(node.nextSibling, command, newValue);

		// "Wrap the one-node list consisting of node, with sibling criteria
		// returning true for a simple modifiable element whose specified
		// command value is equivalent to new value and whose effective command
		// value is loosely equivalent to new value and false otherwise, and
		// with new parent instructions returning null."
		wrap([node],
			function(node) {
				return isSimpleModifiableElement(node)
					&& areEquivalentValues(command, getSpecifiedCommandValue(node, command), newValue)
					&& areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue);
			},
			function() { return null }
		);
	}

	// "If node is invisible, abort this algorithm."
	if (isInvisible(node)) {
		return;
	}

	// "If the effective command value of command is loosely equivalent to new
	// value on node, abort this algorithm."
	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
		return;
	}

	// "If node is not an allowed child of "span":"
	if (!isAllowedChild(node, "span")) {
		// "Let children be all children of node, omitting any that are
		// Elements whose specified command value for command is neither null
		// nor equivalent to new value."
		var children = [];
		for (var i = 0; i < node.childNodes.length; i++) {
			if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
				var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);

				if (specifiedValue !== null
				&& !areEquivalentValues(command, newValue, specifiedValue)) {
					continue;
				}
			}
			children.push(node.childNodes[i]);
		}

		// "Force the value of each Node in children, with command and new
		// value as in this invocation of the algorithm."
		for (var i = 0; i < children.length; i++) {
			forceValue(children[i], command, newValue);
		}

		// "Abort this algorithm."
		return;
	}

	// "If the effective command value of command is loosely equivalent to new
	// value on node, abort this algorithm."
	if (areLooselyEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
		return;
	}

	// "Let new parent be null."
	var newParent = null;

	// "If the CSS styling flag is false:"
	if (!cssStylingFlag) {
		// "If command is "bold" and new value is "bold", let new parent be the
		// result of calling createElement("b") on the ownerDocument of node."
		if (command == "bold" && (newValue == "bold" || newValue == "700")) {
			newParent = node.ownerDocument.createElement("b");
		}

		// "If command is "italic" and new value is "italic", let new parent be
		// the result of calling createElement("i") on the ownerDocument of
		// node."
		if (command == "italic" && newValue == "italic") {
			newParent = node.ownerDocument.createElement("i");
		}

		// "If command is "strikethrough" and new value is "line-through", let
		// new parent be the result of calling createElement("s") on the
		// ownerDocument of node."
		if (command == "strikethrough" && newValue == "line-through") {
			newParent = node.ownerDocument.createElement("s");
		}

		// "If command is "underline" and new value is "underline", let new
		// parent be the result of calling createElement("u") on the
		// ownerDocument of node."
		if (command == "underline" && newValue == "underline") {
			newParent = node.ownerDocument.createElement("u");
		}

		// "If command is "foreColor", and new value is fully opaque with red,
		// green, and blue components in the range 0 to 255:"
		if (command == "forecolor" && parseSimpleColor(newValue)) {
			// "Let new parent be the result of calling createElement("font")
			// on the ownerDocument of node."
			newParent = node.ownerDocument.createElement("font");

			// "Set the color attribute of new parent to the result of applying
			// the rules for serializing simple color values to new value
			// (interpreted as a simple color)."
			newParent.setAttribute("color", parseSimpleColor(newValue));
		}

		// "If command is "fontName", let new parent be the result of calling
		// createElement("font") on the ownerDocument of node, then set the
		// face attribute of new parent to new value."
		if (command == "fontname") {
			newParent = node.ownerDocument.createElement("font");
			newParent.face = newValue;
		}
	}

	// "If command is "createLink" or "unlink":"
	if (command == "createlink" || command == "unlink") {
		// "Let new parent be the result of calling createElement("a") on the
		// ownerDocument of node."
		newParent = node.ownerDocument.createElement("a");

		// "Set the href attribute of new parent to new value."
		newParent.setAttribute("href", newValue);

		// "Let ancestor be node's parent."
		var ancestor = node.parentNode;

		// "While ancestor is not null:"
		while (ancestor) {
			// "If ancestor is an a, set the tag name of ancestor to "span",
			// and let ancestor be the result."
			if (isHtmlElement(ancestor, "A")) {
				ancestor = setTagName(ancestor, "span");
			}

			// "Set ancestor to its parent."
			ancestor = ancestor.parentNode;
		}
	}

	// "If command is "fontSize"; and new value is one of "x-small", "small",
	// "medium", "large", "x-large", "xx-large", or "xxx-large"; and either the
	// CSS styling flag is false, or new value is "xxx-large": let new parent
	// be the result of calling createElement("font") on the ownerDocument of
	// node, then set the size attribute of new parent to the number from the
	// following table based on new value: [table omitted]"
	if (command == "fontsize"
	&& ["x-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(newValue) != -1
	&& (!cssStylingFlag || newValue == "xxx-large")) {
		newParent = node.ownerDocument.createElement("font");
		newParent.size = cssSizeToLegacy(newValue);
	}

	// "If command is "subscript" or "superscript" and new value is
	// "subscript", let new parent be the result of calling
	// createElement("sub") on the ownerDocument of node."
	if ((command == "subscript" || command == "superscript")
	&& newValue == "subscript") {
		newParent = node.ownerDocument.createElement("sub");
	}

	// "If command is "subscript" or "superscript" and new value is
	// "superscript", let new parent be the result of calling
	// createElement("sup") on the ownerDocument of node."
	if ((command == "subscript" || command == "superscript")
	&& newValue == "superscript") {
		newParent = node.ownerDocument.createElement("sup");
	}

	// "If new parent is null, let new parent be the result of calling
	// createElement("span") on the ownerDocument of node."
	if (!newParent) {
		newParent = node.ownerDocument.createElement("span");
	}

	// "Insert new parent in node's parent before node."
	node.parentNode.insertBefore(newParent, node);

	// "If the effective command value of command for new parent is not loosely
	// equivalent to new value, and the relevant CSS property for command is
	// not null, set that CSS property of new parent to new value (if the new
	// value would be valid)."
	var property = commands[command].relevantCssProperty;
	if (property !== null
	&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(newParent, command), newValue)) {
		newParent.style[property] = newValue;
	}

	// "If command is "strikethrough", and new value is "line-through", and the
	// effective command value of "strikethrough" for new parent is not
	// "line-through", set the "text-decoration" property of new parent to
	// "line-through"."
	if (command == "strikethrough"
	&& newValue == "line-through"
	&& getEffectiveCommandValue(newParent, "strikethrough") != "line-through") {
		newParent.style.textDecoration = "line-through";
	}

	// "If command is "underline", and new value is "underline", and the
	// effective command value of "underline" for new parent is not
	// "underline", set the "text-decoration" property of new parent to
	// "underline"."
	if (command == "underline"
	&& newValue == "underline"
	&& getEffectiveCommandValue(newParent, "underline") != "underline") {
		newParent.style.textDecoration = "underline";
	}

	// "Append node to new parent as its last child, preserving ranges."
	movePreservingRanges(node, newParent, newParent.childNodes.length);

	// "If node is an Element and the effective command value of command for
	// node is not loosely equivalent to new value:"
	if (node.nodeType == Node.ELEMENT_NODE
	&& !areEquivalentValues(command, getEffectiveCommandValue(node, command), newValue)) {
		// "Insert node into the parent of new parent before new parent,
		// preserving ranges."
		movePreservingRanges(node, newParent.parentNode, getNodeIndex(newParent));

		// "Remove new parent from its parent."
		newParent.parentNode.removeChild(newParent);

		// "Let children be all children of node, omitting any that are
		// Elements whose specified command value for command is neither null
		// nor equivalent to new value."
		var children = [];
		for (var i = 0; i < node.childNodes.length; i++) {
			if (node.childNodes[i].nodeType == Node.ELEMENT_NODE) {
				var specifiedValue = getSpecifiedCommandValue(node.childNodes[i], command);

				if (specifiedValue !== null
				&& !areEquivalentValues(command, newValue, specifiedValue)) {
					continue;
				}
			}
			children.push(node.childNodes[i]);
		}

		// "Force the value of each Node in children, with command and new
		// value as in this invocation of the algorithm."
		for (var i = 0; i < children.length; i++) {
			forceValue(children[i], command, newValue);
		}
	}
}


//@}
///// Setting the selection's value /////
//@{

function setSelectionValue(command, newValue) {
	// "If there is no formattable node effectively contained in the active
	// range:"
	if (!getAllEffectivelyContainedNodes(getActiveRange())
	.some(isFormattableNode)) {
		// "If command has inline command activated values, set the state
		// override to true if new value is among them and false if it's not."
		if ("inlineCommandActivatedValues" in commands[command]) {
			setStateOverride(command, commands[command].inlineCommandActivatedValues
				.indexOf(newValue) != -1);
		}

		// "If command is "subscript", unset the state override for
		// "superscript"."
		if (command == "subscript") {
			unsetStateOverride("superscript");
		}

		// "If command is "superscript", unset the state override for
		// "subscript"."
		if (command == "superscript") {
			unsetStateOverride("subscript");
		}

		// "If new value is null, unset the value override (if any)."
		if (newValue === null) {
			unsetValueOverride(command);

		// "Otherwise, if command is "createLink" or it has a value specified,
		// set the value override to new value."
		} else if (command == "createlink" || "value" in commands[command]) {
			setValueOverride(command, newValue);
		}

		// "Abort these steps."
		return;
	}

	// "If the active range's start node is an editable Text node, and its
	// start offset is neither zero nor its start node's length, call
	// splitText() on the active range's start node, with argument equal to the
	// active range's start offset. Then set the active range's start node to
	// the result, and its start offset to zero."
	if (isEditable(getActiveRange().startContainer)
	&& getActiveRange().startContainer.nodeType == Node.TEXT_NODE
	&& getActiveRange().startOffset != 0
	&& getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
		// Account for browsers not following range mutation rules
		var newActiveRange = document.createRange();
		var newNode;
		if (getActiveRange().startContainer == getActiveRange().endContainer) {
			var newEndOffset = getActiveRange().endOffset - getActiveRange().startOffset;
			newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
			newActiveRange.setEnd(newNode, newEndOffset);
			getActiveRange().setEnd(newNode, newEndOffset);
		} else {
			newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
		}
		newActiveRange.setStart(newNode, 0);
		getSelection().removeAllRanges();
		getSelection().addRange(newActiveRange);

		getActiveRange().setStart(newNode, 0);
	}

	// "If the active range's end node is an editable Text node, and its end
	// offset is neither zero nor its end node's length, call splitText() on
	// the active range's end node, with argument equal to the active range's
	// end offset."
	if (isEditable(getActiveRange().endContainer)
	&& getActiveRange().endContainer.nodeType == Node.TEXT_NODE
	&& getActiveRange().endOffset != 0
	&& getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
		// IE seems to mutate the range incorrectly here, so we need correction
		// here as well.  The active range will be temporarily in orphaned
		// nodes, so calling getActiveRange() after splitText() but before
		// fixing the range will throw an exception.
		var activeRange = getActiveRange();
		var newStart = [activeRange.startContainer, activeRange.startOffset];
		var newEnd = [activeRange.endContainer, activeRange.endOffset];
		activeRange.endContainer.splitText(activeRange.endOffset);
		activeRange.setStart(newStart[0], newStart[1]);
		activeRange.setEnd(newEnd[0], newEnd[1]);

		getSelection().removeAllRanges();
		getSelection().addRange(activeRange);
	}

	// "Let element list be all editable Elements effectively contained in the
	// active range.
	//
	// "For each element in element list, clear the value of element."
	getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
		return isEditable(node) && node.nodeType == Node.ELEMENT_NODE;
	}).forEach(function(element) {
		clearValue(element, command);
	});

	// "Let node list be all editable nodes effectively contained in the active
	// range.
	//
	// "For each node in node list:"
	getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
		// "Push down values on node."
		pushDownValues(node, command, newValue);

		// "If node is an allowed child of span, force the value of node."
		if (isAllowedChild(node, "span")) {
			forceValue(node, command, newValue);
		}
	});
}


//@}
///// The backColor command /////
//@{
commands.backcolor = {
	// Copy-pasted, same as hiliteColor
	action: function(value) {
		// Action is further copy-pasted, same as foreColor

		// "If value is not a valid CSS color, prepend "#" to it."
		//
		// "If value is still not a valid CSS color, or if it is currentColor,
		// return false."
		//
		// Cheap hack for testing, no attempt to be comprehensive.
		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
			value = "#" + value;
		}
		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
		&& !parseSimpleColor(value)
		&& value.toLowerCase() != "transparent") {
			return false;
		}

		// "Set the selection's value to value."
		setSelectionValue("backcolor", value);

		// "Return true."
		return true;
	}, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
	equivalentValues: function(val1, val2) {
		// "Either both strings are valid CSS colors and have the same red,
		// green, blue, and alpha components, or neither string is a valid CSS
		// color."
		return normalizeColor(val1) === normalizeColor(val2);
	},
};

//@}
///// The bold command /////
//@{
commands.bold = {
	action: function() {
		// "If queryCommandState("bold") returns true, set the selection's
		// value to "normal". Otherwise set the selection's value to "bold".
		// Either way, return true."
		if (myQueryCommandState("bold")) {
			setSelectionValue("bold", "normal");
		} else {
			setSelectionValue("bold", "bold");
		}
		return true;
	}, inlineCommandActivatedValues: ["bold", "600", "700", "800", "900"],
	relevantCssProperty: "fontWeight",
	equivalentValues: function(val1, val2) {
		// "Either the two strings are equal, or one is "bold" and the other is
		// "700", or one is "normal" and the other is "400"."
		return val1 == val2
			|| (val1 == "bold" && val2 == "700")
			|| (val1 == "700" && val2 == "bold")
			|| (val1 == "normal" && val2 == "400")
			|| (val1 == "400" && val2 == "normal");
	},
};

//@}
///// The createLink command /////
//@{
commands.createlink = {
	action: function(value) {
		// "If value is the empty string, return false."
		if (value === "") {
			return false;
		}

		// "For each editable a element that has an href attribute and is an
		// ancestor of some node effectively contained in the active range, set
		// that a element's href attribute to value."
		//
		// TODO: We don't actually do this in tree order, not that it matters
		// unless you're spying with mutation events.
		getAllEffectivelyContainedNodes(getActiveRange()).forEach(function(node) {
			getAncestors(node).forEach(function(ancestor) {
				if (isEditable(ancestor)
				&& isHtmlElement(ancestor, "a")
				&& ancestor.hasAttribute("href")) {
					ancestor.setAttribute("href", value);
				}
			});
		});

		// "Set the selection's value to value."
		setSelectionValue("createlink", value);

		// "Return true."
		return true;
	}
};

//@}
///// The fontName command /////
//@{
commands.fontname = {
	action: function(value) {
		// "Set the selection's value to value, then return true."
		setSelectionValue("fontname", value);
		return true;
	}, standardInlineValueCommand: true, relevantCssProperty: "fontFamily"
};

//@}
///// The fontSize command /////
//@{

// Helper function for fontSize's action plus queryOutputHelper.  It's just the
// middle of fontSize's action, ripped out into its own function.  Returns null
// if the size is invalid.
function normalizeFontSize(value) {
	// "Strip leading and trailing whitespace from value."
	//
	// Cheap hack, not following the actual algorithm.
	value = value.trim();

	// "If value is not a valid floating point number, and would not be a valid
	// floating point number if a single leading "+" character were stripped,
	// return false."
	if (!/^[-+]?[0-9]+(\.[0-9]+)?([eE][-+]?[0-9]+)?$/.test(value)) {
		return null;
	}

	var mode;

	// "If the first character of value is "+", delete the character and let
	// mode be "relative-plus"."
	if (value[0] == "+") {
		value = value.slice(1);
		mode = "relative-plus";
	// "Otherwise, if the first character of value is "-", delete the character
	// and let mode be "relative-minus"."
	} else if (value[0] == "-") {
		value = value.slice(1);
		mode = "relative-minus";
	// "Otherwise, let mode be "absolute"."
	} else {
		mode = "absolute";
	}

	// "Apply the rules for parsing non-negative integers to value, and let
	// number be the result."
	//
	// Another cheap hack.
	var num = parseInt(value);

	// "If mode is "relative-plus", add three to number."
	if (mode == "relative-plus") {
		num += 3;
	}

	// "If mode is "relative-minus", negate number, then add three to it."
	if (mode == "relative-minus") {
		num = 3 - num;
	}

	// "If number is less than one, let number equal 1."
	if (num < 1) {
		num = 1;
	}

	// "If number is greater than seven, let number equal 7."
	if (num > 7) {
		num = 7;
	}

	// "Set value to the string here corresponding to number:" [table omitted]
	value = {
		1: "x-small",
		2: "small",
		3: "medium",
		4: "large",
		5: "x-large",
		6: "xx-large",
		7: "xxx-large"
	}[num];

	return value;
}

commands.fontsize = {
	action: function(value) {
		value = normalizeFontSize(value);
		if (value === null) {
			return false;
		}

		// "Set the selection's value to value."
		setSelectionValue("fontsize", value);

		// "Return true."
		return true;
	}, indeterm: function() {
		// "True if among formattable nodes that are effectively contained in
		// the active range, there are two that have distinct effective command
		// values.  Otherwise false."
		return getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
		.map(function(node) {
			return getEffectiveCommandValue(node, "fontsize");
		}).filter(function(value, i, arr) {
			return arr.slice(0, i).indexOf(value) == -1;
		}).length >= 2;
	}, value: function() {
		// "If the active range is null, return the empty string."
		if (!getActiveRange()) {
			return "";
		}

		// "Let pixel size be the effective command value of the first
		// formattable node that is effectively contained in the active range,
		// or if there is no such node, the effective command value of the
		// active range's start node, in either case interpreted as a number of
		// pixels."
		var node = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];
		if (node === undefined) {
			node = getActiveRange().startContainer;
		}
		var pixelSize = getEffectiveCommandValue(node, "fontsize");

		// "Return the legacy font size for pixel size."
		return getLegacyFontSize(pixelSize);
	}, relevantCssProperty: "fontSize"
};

function getLegacyFontSize(size) {
	if (getLegacyFontSize.resultCache === undefined) {
		getLegacyFontSize.resultCache = {};
	}

	if (getLegacyFontSize.resultCache[size] !== undefined) {
		return getLegacyFontSize.resultCache[size];
	}

	// For convenience in other places in my code, I handle all sizes, not just
	// pixel sizes as the spec says.  This means pixel sizes have to be passed
	// in suffixed with "px", not as plain numbers.
	if (normalizeFontSize(size) !== null) {
		return getLegacyFontSize.resultCache[size] = cssSizeToLegacy(normalizeFontSize(size));
	}

	if (["x-small", "x-small", "small", "medium", "large", "x-large", "xx-large", "xxx-large"].indexOf(size) == -1
	&& !/^[0-9]+(\.[0-9]+)?(cm|mm|in|pt|pc|px)$/.test(size)) {
		// There is no sensible legacy size for things like "2em".
		return getLegacyFontSize.resultCache[size] = null;
	}

	var font = document.createElement("font");
	document.body.appendChild(font);
	if (size == "xxx-large") {
		font.size = 7;
	} else {
		font.style.fontSize = size;
	}
	var pixelSize = parseInt(getComputedStyle(font).fontSize);
	document.body.removeChild(font);

	// "Let returned size be 1."
	var returnedSize = 1;

	// "While returned size is less than 7:"
	while (returnedSize < 7) {
		// "Let lower bound be the resolved value of "font-size" in pixels
		// of a font element whose size attribute is set to returned size."
		var font = document.createElement("font");
		font.size = returnedSize;
		document.body.appendChild(font);
		var lowerBound = parseInt(getComputedStyle(font).fontSize);

		// "Let upper bound be the resolved value of "font-size" in pixels
		// of a font element whose size attribute is set to one plus
		// returned size."
		font.size = 1 + returnedSize;
		var upperBound = parseInt(getComputedStyle(font).fontSize);
		document.body.removeChild(font);

		// "Let average be the average of upper bound and lower bound."
		var average = (upperBound + lowerBound)/2;

		// "If pixel size is less than average, return the one-element
		// string consisting of the digit returned size."
		if (pixelSize < average) {
			return getLegacyFontSize.resultCache[size] = String(returnedSize);
		}

		// "Add one to returned size."
		returnedSize++;
	}

	// "Return "7"."
	return getLegacyFontSize.resultCache[size] = "7";
}

//@}
///// The foreColor command /////
//@{
commands.forecolor = {
	action: function(value) {
		// Copy-pasted, same as backColor and hiliteColor

		// "If value is not a valid CSS color, prepend "#" to it."
		//
		// "If value is still not a valid CSS color, or if it is currentColor,
		// return false."
		//
		// Cheap hack for testing, no attempt to be comprehensive.
		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
			value = "#" + value;
		}
		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
		&& !parseSimpleColor(value)
		&& value.toLowerCase() != "transparent") {
			return false;
		}

		// "Set the selection's value to value."
		setSelectionValue("forecolor", value);

		// "Return true."
		return true;
	}, standardInlineValueCommand: true, relevantCssProperty: "color",
	equivalentValues: function(val1, val2) {
		// "Either both strings are valid CSS colors and have the same red,
		// green, blue, and alpha components, or neither string is a valid CSS
		// color."
		return normalizeColor(val1) === normalizeColor(val2);
	},
};

//@}
///// The hiliteColor command /////
//@{
commands.hilitecolor = {
	// Copy-pasted, same as backColor
	action: function(value) {
		// Action is further copy-pasted, same as foreColor

		// "If value is not a valid CSS color, prepend "#" to it."
		//
		// "If value is still not a valid CSS color, or if it is currentColor,
		// return false."
		//
		// Cheap hack for testing, no attempt to be comprehensive.
		if (/^([0-9a-fA-F]{3}){1,2}$/.test(value)) {
			value = "#" + value;
		}
		if (!/^(rgba?|hsla?)\(.*\)$/.test(value)
		&& !parseSimpleColor(value)
		&& value.toLowerCase() != "transparent") {
			return false;
		}

		// "Set the selection's value to value."
		setSelectionValue("hilitecolor", value);

		// "Return true."
		return true;
	}, indeterm: function() {
		// "True if among editable Text nodes that are effectively contained in
		// the active range, there are two that have distinct effective command
		// values.  Otherwise false."
		return getAllEffectivelyContainedNodes(getActiveRange(), function(node) {
			return isEditable(node) && node.nodeType == Node.TEXT_NODE;
		}).map(function(node) {
			return getEffectiveCommandValue(node, "hilitecolor");
		}).filter(function(value, i, arr) {
			return arr.slice(0, i).indexOf(value) == -1;
		}).length >= 2;
	}, standardInlineValueCommand: true, relevantCssProperty: "backgroundColor",
	equivalentValues: function(val1, val2) {
		// "Either both strings are valid CSS colors and have the same red,
		// green, blue, and alpha components, or neither string is a valid CSS
		// color."
		return normalizeColor(val1) === normalizeColor(val2);
	},
};

//@}
///// The italic command /////
//@{
commands.italic = {
	action: function() {
		// "If queryCommandState("italic") returns true, set the selection's
		// value to "normal". Otherwise set the selection's value to "italic".
		// Either way, return true."
		if (myQueryCommandState("italic")) {
			setSelectionValue("italic", "normal");
		} else {
			setSelectionValue("italic", "italic");
		}
		return true;
	}, inlineCommandActivatedValues: ["italic", "oblique"],
	relevantCssProperty: "fontStyle"
};

//@}
///// The removeFormat command /////
//@{
commands.removeformat = {
	action: function() {
		// "A removeFormat candidate is an editable HTML element with local
		// name "abbr", "acronym", "b", "bdi", "bdo", "big", "blink", "cite",
		// "code", "dfn", "em", "font", "i", "ins", "kbd", "mark", "nobr", "q",
		// "s", "samp", "small", "span", "strike", "strong", "sub", "sup",
		// "tt", "u", or "var"."
		function isRemoveFormatCandidate(node) {
			return isEditable(node)
				&& isHtmlElement(node, ["abbr", "acronym", "b", "bdi", "bdo",
				"big", "blink", "cite", "code", "dfn", "em", "font", "i",
				"ins", "kbd", "mark", "nobr", "q", "s", "samp", "small",
				"span", "strike", "strong", "sub", "sup", "tt", "u", "var"]);
		}

		// "Let elements to remove be a list of every removeFormat candidate
		// effectively contained in the active range."
		var elementsToRemove = getAllEffectivelyContainedNodes(getActiveRange(), isRemoveFormatCandidate);

		// "For each element in elements to remove:"
		elementsToRemove.forEach(function(element) {
			// "While element has children, insert the first child of element
			// into the parent of element immediately before element,
			// preserving ranges."
			while (element.hasChildNodes()) {
				movePreservingRanges(element.firstChild, element.parentNode, getNodeIndex(element));
			}

			// "Remove element from its parent."
			element.parentNode.removeChild(element);
		});

		// "If the active range's start node is an editable Text node, and its
		// start offset is neither zero nor its start node's length, call
		// splitText() on the active range's start node, with argument equal to
		// the active range's start offset. Then set the active range's start
		// node to the result, and its start offset to zero."
		if (isEditable(getActiveRange().startContainer)
		&& getActiveRange().startContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().startOffset != 0
		&& getActiveRange().startOffset != getNodeLength(getActiveRange().startContainer)) {
			// Account for browsers not following range mutation rules
			if (getActiveRange().startContainer == getActiveRange().endContainer) {
				var newEnd = getActiveRange().endOffset - getActiveRange().startOffset;
				var newNode = getActiveRange().startContainer.splitText(getActiveRange().startOffset);
				getActiveRange().setStart(newNode, 0);
				getActiveRange().setEnd(newNode, newEnd);
			} else {
				getActiveRange().setStart(getActiveRange().startContainer.splitText(getActiveRange().startOffset), 0);
			}
		}

		// "If the active range's end node is an editable Text node, and its
		// end offset is neither zero nor its end node's length, call
		// splitText() on the active range's end node, with argument equal to
		// the active range's end offset."
		if (isEditable(getActiveRange().endContainer)
		&& getActiveRange().endContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().endOffset != 0
		&& getActiveRange().endOffset != getNodeLength(getActiveRange().endContainer)) {
			// IE seems to mutate the range incorrectly here, so we need
			// correction here as well.  Have to be careful to set the range to
			// something not including the text node so that getActiveRange()
			// doesn't throw an exception due to a temporarily detached
			// endpoint.
			var newStart = [getActiveRange().startContainer, getActiveRange().startOffset];
			var newEnd = [getActiveRange().endContainer, getActiveRange().endOffset];
			getActiveRange().setEnd(document.documentElement, 0);
			newEnd[0].splitText(newEnd[1]);
			getActiveRange().setStart(newStart[0], newStart[1]);
			getActiveRange().setEnd(newEnd[0], newEnd[1]);
		}

		// "Let node list consist of all editable nodes effectively contained
		// in the active range."
		//
		// "For each node in node list, while node's parent is a removeFormat
		// candidate in the same editing host as node, split the parent of the
		// one-node list consisting of node."
		getAllEffectivelyContainedNodes(getActiveRange(), isEditable).forEach(function(node) {
			while (isRemoveFormatCandidate(node.parentNode)
			&& inSameEditingHost(node.parentNode, node)) {
				splitParent([node]);
			}
		});

		// "For each of the entries in the following list, in the given order,
		// set the selection's value to null, with command as given."
		[
			"subscript",
			"bold",
			"fontname",
			"fontsize",
			"forecolor",
			"hilitecolor",
			"italic",
			"strikethrough",
			"underline",
		].forEach(function(command) {
			setSelectionValue(command, null);
		});

		// "Return true."
		return true;
	}
};

//@}
///// The strikethrough command /////
//@{
commands.strikethrough = {
	action: function() {
		// "If queryCommandState("strikethrough") returns true, set the
		// selection's value to null. Otherwise set the selection's value to
		// "line-through".  Either way, return true."
		if (myQueryCommandState("strikethrough")) {
			setSelectionValue("strikethrough", null);
		} else {
			setSelectionValue("strikethrough", "line-through");
		}
		return true;
	}, inlineCommandActivatedValues: ["line-through"]
};

//@}
///// The subscript command /////
//@{
commands.subscript = {
	action: function() {
		// "Call queryCommandState("subscript"), and let state be the result."
		var state = myQueryCommandState("subscript");

		// "Set the selection's value to null."
		setSelectionValue("subscript", null);

		// "If state is false, set the selection's value to "subscript"."
		if (!state) {
			setSelectionValue("subscript", "subscript");
		}

		// "Return true."
		return true;
	}, indeterm: function() {
		// "True if either among formattable nodes that are effectively
		// contained in the active range, there is at least one with effective
		// command value "subscript" and at least one with some other effective
		// command value; or if there is some formattable node effectively
		// contained in the active range with effective command value "mixed".
		// Otherwise false."
		var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
		return (nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "subscript" })
			&& nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") != "subscript" }))
			|| nodes.some(function(node) { return getEffectiveCommandValue(node, "subscript") == "mixed" });
	}, inlineCommandActivatedValues: ["subscript"],
};

//@}
///// The superscript command /////
//@{
commands.superscript = {
	action: function() {
		// "Call queryCommandState("superscript"), and let state be the
		// result."
		var state = myQueryCommandState("superscript");

		// "Set the selection's value to null."
		setSelectionValue("superscript", null);

		// "If state is false, set the selection's value to "superscript"."
		if (!state) {
			setSelectionValue("superscript", "superscript");
		}

		// "Return true."
		return true;
	}, indeterm: function() {
		// "True if either among formattable nodes that are effectively
		// contained in the active range, there is at least one with effective
		// command value "superscript" and at least one with some other
		// effective command value; or if there is some formattable node
		// effectively contained in the active range with effective command
		// value "mixed".  Otherwise false."
		var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);
		return (nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "superscript" })
			&& nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") != "superscript" }))
			|| nodes.some(function(node) { return getEffectiveCommandValue(node, "superscript") == "mixed" });
	}, inlineCommandActivatedValues: ["superscript"],
};

//@}
///// The underline command /////
//@{
commands.underline = {
	action: function() {
		// "If queryCommandState("underline") returns true, set the selection's
		// value to null. Otherwise set the selection's value to "underline".
		// Either way, return true."
		if (myQueryCommandState("underline")) {
			setSelectionValue("underline", null);
		} else {
			setSelectionValue("underline", "underline");
		}
		return true;
	}, inlineCommandActivatedValues: ["underline"]
};

//@}
///// The unlink command /////
//@{
commands.unlink = {
	action: function() {
		// "Let hyperlinks be a list of every a element that has an href
		// attribute and is contained in the active range or is an ancestor of
		// one of its boundary points."
		//
		// As usual, take care to ensure it's tree order.  The correctness of
		// the following is left as an exercise for the reader.
		var range = getActiveRange();
		var hyperlinks = [];
		for (
			var node = range.startContainer;
			node;
			node = node.parentNode
		) {
			if (isHtmlElement(node, "A")
			&& node.hasAttribute("href")) {
				hyperlinks.unshift(node);
			}
		}
		for (
			var node = range.startContainer;
			node != nextNodeDescendants(range.endContainer);
			node = nextNode(node)
		) {
			if (isHtmlElement(node, "A")
			&& node.hasAttribute("href")
			&& (isContained(node, range)
			|| isAncestor(node, range.endContainer)
			|| node == range.endContainer)) {
				hyperlinks.push(node);
			}
		}

		// "Clear the value of each member of hyperlinks."
		for (var i = 0; i < hyperlinks.length; i++) {
			clearValue(hyperlinks[i], "unlink");
		}

		// "Return true."
		return true;
	}
};

//@}

/////////////////////////////////////
///// Block formatting commands /////
/////////////////////////////////////

///// Block formatting command definitions /////
//@{

// "An indentation element is either a blockquote, or a div that has a style
// attribute that sets "margin" or some subproperty of it."
function isIndentationElement(node) {
	if (!isHtmlElement(node)) {
		return false;
	}

	if (node.tagName == "BLOCKQUOTE") {
		return true;
	}

	if (node.tagName != "DIV") {
		return false;
	}

	for (var i = 0; i < node.style.length; i++) {
		// Approximate check
		if (/^(-[a-z]+-)?margin/.test(node.style[i])) {
			return true;
		}
	}

	return false;
}

// "A simple indentation element is an indentation element that has no
// attributes except possibly
//
//   * "a style attribute that sets no properties other than "margin",
//     "border", "padding", or subproperties of those; and/or
//   * "a dir attribute."
function isSimpleIndentationElement(node) {
	if (!isIndentationElement(node)) {
		return false;
	}

	for (var i = 0; i < node.attributes.length; i++) {
		if (!isHtmlNamespace(node.attributes[i].namespaceURI)
		|| ["style", "dir"].indexOf(node.attributes[i].name) == -1) {
			return false;
		}
	}

	for (var i = 0; i < node.style.length; i++) {
		// This is approximate, but it works well enough for my purposes.
		if (!/^(-[a-z]+-)?(margin|border|padding)/.test(node.style[i])) {
			return false;
		}
	}

	return true;
}

// "A non-list single-line container is an HTML element with local name
// "address", "div", "h1", "h2", "h3", "h4", "h5", "h6", "listing", "p", "pre",
// or "xmp"."
function isNonListSingleLineContainer(node) {
	return isHtmlElement(node, ["address", "div", "h1", "h2", "h3", "h4", "h5",
		"h6", "listing", "p", "pre", "xmp"]);
}

// "A single-line container is either a non-list single-line container, or an
// HTML element with local name "li", "dt", or "dd"."
function isSingleLineContainer(node) {
	return isNonListSingleLineContainer(node)
		|| isHtmlElement(node, ["li", "dt", "dd"]);
}

function getBlockNodeOf(node) {
	// "While node is an inline node, set node to its parent."
	while (isInlineNode(node)) {
		node = node.parentNode;
	}

	// "Return node."
	return node;
}

//@}
///// Assorted block formatting command algorithms /////
//@{

function fixDisallowedAncestors(node) {
	// "If node is not editable, abort these steps."
	if (!isEditable(node)) {
		return;
	}

	// "If node is not an allowed child of any of its ancestors in the same
	// editing host:"
	if (getAncestors(node).every(function(ancestor) {
		return !inSameEditingHost(node, ancestor)
			|| !isAllowedChild(node, ancestor)
	})) {
		// "If node is a dd or dt, wrap the one-node list consisting of node,
		// with sibling criteria returning true for any dl with no attributes
		// and false otherwise, and new parent instructions returning the
		// result of calling createElement("dl") on the context object. Then
		// abort these steps."
		if (isHtmlElement(node, ["dd", "dt"])) {
			wrap([node],
				function(sibling) { return isHtmlElement(sibling, "dl") && !sibling.attributes.length },
				function() { return document.createElement("dl") });
			return;
		}

		// "If "p" is not an allowed child of the editing host of node, abort
		// these steps."
		if (!isAllowedChild("p", getEditingHostOf(node))) {
			return;
		}

		// "If node is not a prohibited paragraph child, abort these steps."
		if (!isProhibitedParagraphChild(node)) {
			return;
		}

		// "Set the tag name of node to the default single-line container name,
		// and let node be the result."
		node = setTagName(node, defaultSingleLineContainerName);

		// "Fix disallowed ancestors of node."
		fixDisallowedAncestors(node);

		// "Let children be node's children."
		var children = [].slice.call(node.childNodes);

		// "For each child in children, if child is a prohibited paragraph
		// child:"
		children.filter(isProhibitedParagraphChild)
		.forEach(function(child) {
			// "Record the values of the one-node list consisting of child, and
			// let values be the result."
			var values = recordValues([child]);

			// "Split the parent of the one-node list consisting of child."
			splitParent([child]);

			// "Restore the values from values."
			restoreValues(values);
		});

		// "Abort these steps."
		return;
	}

	// "Record the values of the one-node list consisting of node, and let
	// values be the result."
	var values = recordValues([node]);

	// "While node is not an allowed child of its parent, split the parent of
	// the one-node list consisting of node."
	while (!isAllowedChild(node, node.parentNode)) {
		splitParent([node]);
	}

	// "Restore the values from values."
	restoreValues(values);
}

function normalizeSublists(item) {
	// "If item is not an li or it is not editable or its parent is not
	// editable, abort these steps."
	if (!isHtmlElement(item, "LI")
	|| !isEditable(item)
	|| !isEditable(item.parentNode)) {
		return;
	}

	// "Let new item be null."
	var newItem = null;

	// "While item has an ol or ul child:"
	while ([].some.call(item.childNodes, function (node) { return isHtmlElement(node, ["OL", "UL"]) })) {
		// "Let child be the last child of item."
		var child = item.lastChild;

		// "If child is an ol or ul, or new item is null and child is a Text
		// node whose data consists of zero of more space characters:"
		if (isHtmlElement(child, ["OL", "UL"])
		|| (!newItem && child.nodeType == Node.TEXT_NODE && /^[ \t\n\f\r]*$/.test(child.data))) {
			// "Set new item to null."
			newItem = null;

			// "Insert child into the parent of item immediately following
			// item, preserving ranges."
			movePreservingRanges(child, item.parentNode, 1 + getNodeIndex(item));

		// "Otherwise:"
		} else {
			// "If new item is null, let new item be the result of calling
			// createElement("li") on the ownerDocument of item, then insert
			// new item into the parent of item immediately after item."
			if (!newItem) {
				newItem = item.ownerDocument.createElement("li");
				item.parentNode.insertBefore(newItem, item.nextSibling);
			}

			// "Insert child into new item as its first child, preserving
			// ranges."
			movePreservingRanges(child, newItem, 0);
		}
	}
}

function getSelectionListState() {
	// "If the active range is null, return "none"."
	if (!getActiveRange()) {
		return "none";
	}

	// "Block-extend the active range, and let new range be the result."
	var newRange = blockExtend(getActiveRange());

	// "Let node list be a list of nodes, initially empty."
	//
	// "For each node contained in new range, append node to node list if the
	// last member of node list (if any) is not an ancestor of node; node is
	// editable; node is not an indentation element; and node is either an ol
	// or ul, or the child of an ol or ul, or an allowed child of "li"."
	var nodeList = getContainedNodes(newRange, function(node) {
		return isEditable(node)
			&& !isIndentationElement(node)
			&& (isHtmlElement(node, ["ol", "ul"])
			|| isHtmlElement(node.parentNode, ["ol", "ul"])
			|| isAllowedChild(node, "li"));
	});

	// "If node list is empty, return "none"."
	if (!nodeList.length) {
		return "none";
	}

	// "If every member of node list is either an ol or the child of an ol or
	// the child of an li child of an ol, and none is a ul or an ancestor of a
	// ul, return "ol"."
	if (nodeList.every(function(node) {
		return isHtmlElement(node, "ol")
			|| isHtmlElement(node.parentNode, "ol")
			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
	})
	&& !nodeList.some(function(node) { return isHtmlElement(node, "ul") || ("querySelector" in node && node.querySelector("ul")) })) {
		return "ol";
	}

	// "If every member of node list is either a ul or the child of a ul or the
	// child of an li child of a ul, and none is an ol or an ancestor of an ol,
	// return "ul"."
	if (nodeList.every(function(node) {
		return isHtmlElement(node, "ul")
			|| isHtmlElement(node.parentNode, "ul")
			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
	})
	&& !nodeList.some(function(node) { return isHtmlElement(node, "ol") || ("querySelector" in node && node.querySelector("ol")) })) {
		return "ul";
	}

	var hasOl = nodeList.some(function(node) {
		return isHtmlElement(node, "ol")
			|| isHtmlElement(node.parentNode, "ol")
			|| ("querySelector" in node && node.querySelector("ol"))
			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ol"));
	});
	var hasUl = nodeList.some(function(node) {
		return isHtmlElement(node, "ul")
			|| isHtmlElement(node.parentNode, "ul")
			|| ("querySelector" in node && node.querySelector("ul"))
			|| (isHtmlElement(node.parentNode, "li") && isHtmlElement(node.parentNode.parentNode, "ul"));
	});
	// "If some member of node list is either an ol or the child or ancestor of
	// an ol or the child of an li child of an ol, and some member of node list
	// is either a ul or the child or ancestor of a ul or the child of an li
	// child of a ul, return "mixed"."
	if (hasOl && hasUl) {
		return "mixed";
	}

	// "If some member of node list is either an ol or the child or ancestor of
	// an ol or the child of an li child of an ol, return "mixed ol"."
	if (hasOl) {
		return "mixed ol";
	}

	// "If some member of node list is either a ul or the child or ancestor of
	// a ul or the child of an li child of a ul, return "mixed ul"."
	if (hasUl) {
		return "mixed ul";
	}

	// "Return "none"."
	return "none";
}

function getAlignmentValue(node) {
	// "While node is neither null nor an Element, or it is an Element but its
	// "display" property has resolved value "inline" or "none", set node to
	// its parent."
	while ((node && node.nodeType != Node.ELEMENT_NODE)
	|| (node.nodeType == Node.ELEMENT_NODE
	&& ["inline", "none"].indexOf(getComputedStyle(node).display) != -1)) {
		node = node.parentNode;
	}

	// "If node is not an Element, return "left"."
	if (!node || node.nodeType != Node.ELEMENT_NODE) {
		return "left";
	}

	var resolvedValue = getComputedStyle(node).textAlign
		// Hack around browser non-standardness
		.replace(/^-(moz|webkit)-/, "")
		.replace(/^auto$/, "start");

	// "If node's "text-align" property has resolved value "start", return
	// "left" if the directionality of node is "ltr", "right" if it is "rtl"."
	if (resolvedValue == "start") {
		return getDirectionality(node) == "ltr" ? "left" : "right";
	}

	// "If node's "text-align" property has resolved value "end", return
	// "right" if the directionality of node is "ltr", "left" if it is "rtl"."
	if (resolvedValue == "end") {
		return getDirectionality(node) == "ltr" ? "right" : "left";
	}

	// "If node's "text-align" property has resolved value "center", "justify",
	// "left", or "right", return that value."
	if (["center", "justify", "left", "right"].indexOf(resolvedValue) != -1) {
		return resolvedValue;
	}

	// "Return "left"."
	return "left";
}

function getNextEquivalentPoint(node, offset) {
	// "If node's length is zero, return null."
	if (getNodeLength(node) == 0) {
		return null;
	}

	// "If offset is node's length, and node's parent is not null, and node is
	// an inline node, return (node's parent, 1 + node's index)."
	if (offset == getNodeLength(node)
	&& node.parentNode
	&& isInlineNode(node)) {
		return [node.parentNode, 1 + getNodeIndex(node)];
	}

	// "If node has a child with index offset, and that child's length is not
	// zero, and that child is an inline node, return (that child, 0)."
	if (0 <= offset
	&& offset < node.childNodes.length
	&& getNodeLength(node.childNodes[offset]) != 0
	&& isInlineNode(node.childNodes[offset])) {
		return [node.childNodes[offset], 0];
	}

	// "Return null."
	return null;
}

function getPreviousEquivalentPoint(node, offset) {
	// "If node's length is zero, return null."
	if (getNodeLength(node) == 0) {
		return null;
	}

	// "If offset is 0, and node's parent is not null, and node is an inline
	// node, return (node's parent, node's index)."
	if (offset == 0
	&& node.parentNode
	&& isInlineNode(node)) {
		return [node.parentNode, getNodeIndex(node)];
	}

	// "If node has a child with index offset − 1, and that child's length is
	// not zero, and that child is an inline node, return (that child, that
	// child's length)."
	if (0 <= offset - 1
	&& offset - 1 < node.childNodes.length
	&& getNodeLength(node.childNodes[offset - 1]) != 0
	&& isInlineNode(node.childNodes[offset - 1])) {
		return [node.childNodes[offset - 1], getNodeLength(node.childNodes[offset - 1])];
	}

	// "Return null."
	return null;
}

function getFirstEquivalentPoint(node, offset) {
	// "While (node, offset)'s previous equivalent point is not null, set
	// (node, offset) to its previous equivalent point."
	var prev;
	while (prev = getPreviousEquivalentPoint(node, offset)) {
		node = prev[0];
		offset = prev[1];
	}

	// "Return (node, offset)."
	return [node, offset];
}

function getLastEquivalentPoint(node, offset) {
	// "While (node, offset)'s next equivalent point is not null, set (node,
	// offset) to its next equivalent point."
	var next;
	while (next = getNextEquivalentPoint(node, offset)) {
		node = next[0];
		offset = next[1];
	}

	// "Return (node, offset)."
	return [node, offset];
}

//@}
///// Block-extending a range /////
//@{

// "A boundary point (node, offset) is a block start point if either node's
// parent is null and offset is zero; or node has a child with index offset −
// 1, and that child is either a visible block node or a visible br."
function isBlockStartPoint(node, offset) {
	return (!node.parentNode && offset == 0)
		|| (0 <= offset - 1
		&& offset - 1 < node.childNodes.length
		&& isVisible(node.childNodes[offset - 1])
		&& (isBlockNode(node.childNodes[offset - 1])
		|| isHtmlElement(node.childNodes[offset - 1], "br")));
}

// "A boundary point (node, offset) is a block end point if either node's
// parent is null and offset is node's length; or node has a child with index
// offset, and that child is a visible block node."
function isBlockEndPoint(node, offset) {
	return (!node.parentNode && offset == getNodeLength(node))
		|| (offset < node.childNodes.length
		&& isVisible(node.childNodes[offset])
		&& isBlockNode(node.childNodes[offset]));
}

// "A boundary point is a block boundary point if it is either a block start
// point or a block end point."
function isBlockBoundaryPoint(node, offset) {
	return isBlockStartPoint(node, offset)
		|| isBlockEndPoint(node, offset);
}

function blockExtend(range) {
	// "Let start node, start offset, end node, and end offset be the start
	// and end nodes and offsets of the range."
	var startNode = range.startContainer;
	var startOffset = range.startOffset;
	var endNode = range.endContainer;
	var endOffset = range.endOffset;

	// "If some ancestor container of start node is an li, set start offset to
	// the index of the last such li in tree order, and set start node to that
	// li's parent."
	var liAncestors = getAncestors(startNode).concat(startNode)
		.filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
		.slice(-1);
	if (liAncestors.length) {
		startOffset = getNodeIndex(liAncestors[0]);
		startNode = liAncestors[0].parentNode;
	}

	// "If (start node, start offset) is not a block start point, repeat the
	// following steps:"
	if (!isBlockStartPoint(startNode, startOffset)) do {
		// "If start offset is zero, set it to start node's index, then set
		// start node to its parent."
		if (startOffset == 0) {
			startOffset = getNodeIndex(startNode);
			startNode = startNode.parentNode;

		// "Otherwise, subtract one from start offset."
		} else {
			startOffset--;
		}

		// "If (start node, start offset) is a block boundary point, break from
		// this loop."
	} while (!isBlockBoundaryPoint(startNode, startOffset));

	// "While start offset is zero and start node's parent is not null, set
	// start offset to start node's index, then set start node to its parent."
	while (startOffset == 0
	&& startNode.parentNode) {
		startOffset = getNodeIndex(startNode);
		startNode = startNode.parentNode;
	}

	// "If some ancestor container of end node is an li, set end offset to one
	// plus the index of the last such li in tree order, and set end node to
	// that li's parent."
	var liAncestors = getAncestors(endNode).concat(endNode)
		.filter(function(ancestor) { return isHtmlElement(ancestor, "li") })
		.slice(-1);
	if (liAncestors.length) {
		endOffset = 1 + getNodeIndex(liAncestors[0]);
		endNode = liAncestors[0].parentNode;
	}

	// "If (end node, end offset) is not a block end point, repeat the
	// following steps:"
	if (!isBlockEndPoint(endNode, endOffset)) do {
		// "If end offset is end node's length, set it to one plus end node's
		// index, then set end node to its parent."
		if (endOffset == getNodeLength(endNode)) {
			endOffset = 1 + getNodeIndex(endNode);
			endNode = endNode.parentNode;

		// "Otherwise, add one to end offset.
		} else {
			endOffset++;
		}

		// "If (end node, end offset) is a block boundary point, break from
		// this loop."
	} while (!isBlockBoundaryPoint(endNode, endOffset));

	// "While end offset is end node's length and end node's parent is not
	// null, set end offset to one plus end node's index, then set end node to
	// its parent."
	while (endOffset == getNodeLength(endNode)
	&& endNode.parentNode) {
		endOffset = 1 + getNodeIndex(endNode);
		endNode = endNode.parentNode;
	}

	// "Let new range be a new range whose start and end nodes and offsets
	// are start node, start offset, end node, and end offset."
	var newRange = startNode.ownerDocument.createRange();
	newRange.setStart(startNode, startOffset);
	newRange.setEnd(endNode, endOffset);

	// "Return new range."
	return newRange;
}

function followsLineBreak(node) {
	// "Let offset be zero."
	var offset = 0;

	// "While (node, offset) is not a block boundary point:"
	while (!isBlockBoundaryPoint(node, offset)) {
		// "If node has a visible child with index offset minus one, return
		// false."
		if (0 <= offset - 1
		&& offset - 1 < node.childNodes.length
		&& isVisible(node.childNodes[offset - 1])) {
			return false;
		}

		// "If offset is zero or node has no children, set offset to node's
		// index, then set node to its parent."
		if (offset == 0
		|| !node.hasChildNodes()) {
			offset = getNodeIndex(node);
			node = node.parentNode;

		// "Otherwise, set node to its child with index offset minus one, then
		// set offset to node's length."
		} else {
			node = node.childNodes[offset - 1];
			offset = getNodeLength(node);
		}
	}

	// "Return true."
	return true;
}

function precedesLineBreak(node) {
	// "Let offset be node's length."
	var offset = getNodeLength(node);

	// "While (node, offset) is not a block boundary point:"
	while (!isBlockBoundaryPoint(node, offset)) {
		// "If node has a visible child with index offset, return false."
		if (offset < node.childNodes.length
		&& isVisible(node.childNodes[offset])) {
			return false;
		}

		// "If offset is node's length or node has no children, set offset to
		// one plus node's index, then set node to its parent."
		if (offset == getNodeLength(node)
		|| !node.hasChildNodes()) {
			offset = 1 + getNodeIndex(node);
			node = node.parentNode;

		// "Otherwise, set node to its child with index offset and set offset
		// to zero."
		} else {
			node = node.childNodes[offset];
			offset = 0;
		}
	}

	// "Return true."
	return true;
}

//@}
///// Recording and restoring overrides /////
//@{

function recordCurrentOverrides() {
	// "Let overrides be a list of (string, string or boolean) ordered pairs,
	// initially empty."
	var overrides = [];

	// "If there is a value override for "createLink", add ("createLink", value
	// override for "createLink") to overrides."
	if (getValueOverride("createlink") !== undefined) {
		overrides.push(["createlink", getValueOverride("createlink")]);
	}

	// "For each command in the list "bold", "italic", "strikethrough",
	// "subscript", "superscript", "underline", in order: if there is a state
	// override for command, add (command, command's state override) to
	// overrides."
	["bold", "italic", "strikethrough", "subscript", "superscript",
	"underline"].forEach(function(command) {
		if (getStateOverride(command) !== undefined) {
			overrides.push([command, getStateOverride(command)]);
		}
	});

	// "For each command in the list "fontName", "fontSize", "foreColor",
	// "hiliteColor", in order: if there is a value override for command, add
	// (command, command's value override) to overrides."
	["fontname", "fontsize", "forecolor",
	"hilitecolor"].forEach(function(command) {
		if (getValueOverride(command) !== undefined) {
			overrides.push([command, getValueOverride(command)]);
		}
	});

	// "Return overrides."
	return overrides;
}

function recordCurrentStatesAndValues() {
	// "Let overrides be a list of (string, string or boolean) ordered pairs,
	// initially empty."
	var overrides = [];

	// "Let node be the first formattable node effectively contained in the
	// active range, or null if there is none."
	var node = getAllEffectivelyContainedNodes(getActiveRange())
		.filter(isFormattableNode)[0];

	// "If node is null, return overrides."
	if (!node) {
		return overrides;
	}

	// "Add ("createLink", node's effective command value for "createLink") to
	// overrides."
	overrides.push(["createlink", getEffectiveCommandValue(node, "createlink")]);

	// "For each command in the list "bold", "italic", "strikethrough",
	// "subscript", "superscript", "underline", in order: if node's effective
	// command value for command is one of its inline command activated values,
	// add (command, true) to overrides, and otherwise add (command, false) to
	// overrides."
	["bold", "italic", "strikethrough", "subscript", "superscript",
	"underline"].forEach(function(command) {
		if (commands[command].inlineCommandActivatedValues
		.indexOf(getEffectiveCommandValue(node, command)) != -1) {
			overrides.push([command, true]);
		} else {
			overrides.push([command, false]);
		}
	});

	// "For each command in the list "fontName", "foreColor", "hiliteColor", in
	// order: add (command, command's value) to overrides."
	["fontname", "fontsize", "forecolor", "hilitecolor"].forEach(function(command) {
		overrides.push([command, commands[command].value()]);
	});

	// "Add ("fontSize", node's effective command value for "fontSize") to
	// overrides."
	overrides.push(["fontsize", getEffectiveCommandValue(node, "fontsize")]);

	// "Return overrides."
	return overrides;
}

function restoreStatesAndValues(overrides) {
	// "Let node be the first formattable node effectively contained in the
	// active range, or null if there is none."
	var node = getAllEffectivelyContainedNodes(getActiveRange())
		.filter(isFormattableNode)[0];

	// "If node is not null, then for each (command, override) pair in
	// overrides, in order:"
	if (node) {
		for (var i = 0; i < overrides.length; i++) {
			var command = overrides[i][0];
			var override = overrides[i][1];

			// "If override is a boolean, and queryCommandState(command)
			// returns something different from override, take the action for
			// command, with value equal to the empty string."
			if (typeof override == "boolean"
			&& myQueryCommandState(command) != override) {
				commands[command].action("");

			// "Otherwise, if override is a string, and command is neither
			// "createLink" nor "fontSize", and queryCommandValue(command)
			// returns something not equivalent to override, take the action
			// for command, with value equal to override."
			} else if (typeof override == "string"
			&& command != "createlink"
			&& command != "fontsize"
			&& !areEquivalentValues(command, myQueryCommandValue(command), override)) {
				commands[command].action(override);

			// "Otherwise, if override is a string; and command is
			// "createLink"; and either there is a value override for
			// "createLink" that is not equal to override, or there is no value
			// override for "createLink" and node's effective command value for
			// "createLink" is not equal to override: take the action for
			// "createLink", with value equal to override."
			} else if (typeof override == "string"
			&& command == "createlink"
			&& (
				(
					getValueOverride("createlink") !== undefined
					&& getValueOverride("createlink") !== override
				) || (
					getValueOverride("createlink") === undefined
					&& getEffectiveCommandValue(node, "createlink") !== override
				)
			)) {
				commands.createlink.action(override);

			// "Otherwise, if override is a string; and command is "fontSize";
			// and either there is a value override for "fontSize" that is not
			// equal to override, or there is no value override for "fontSize"
			// and node's effective command value for "fontSize" is not loosely
			// equivalent to override:"
			} else if (typeof override == "string"
			&& command == "fontsize"
			&& (
				(
					getValueOverride("fontsize") !== undefined
					&& getValueOverride("fontsize") !== override
				) || (
					getValueOverride("fontsize") === undefined
					&& !areLooselyEquivalentValues(command, getEffectiveCommandValue(node, "fontsize"), override)
				)
			)) {
				// "Convert override to an integer number of pixels, and set
				// override to the legacy font size for the result."
				override = getLegacyFontSize(override);

				// "Take the action for "fontSize", with value equal to
				// override."
				commands.fontsize.action(override);

			// "Otherwise, continue this loop from the beginning."
			} else {
				continue;
			}

			// "Set node to the first formattable node effectively contained in
			// the active range, if there is one."
			node = getAllEffectivelyContainedNodes(getActiveRange())
				.filter(isFormattableNode)[0]
				|| node;
		}

	// "Otherwise, for each (command, override) pair in overrides, in order:"
	} else {
		for (var i = 0; i < overrides.length; i++) {
			var command = overrides[i][0];
			var override = overrides[i][1];

			// "If override is a boolean, set the state override for command to
			// override."
			if (typeof override == "boolean") {
				setStateOverride(command, override);
			}

			// "If override is a string, set the value override for command to
			// override."
			if (typeof override == "string") {
				setValueOverride(command, override);
			}
		}
	}
}

//@}
///// Deleting the selection /////
//@{

// The flags argument is a dictionary that can have blockMerging,
// stripWrappers, and/or direction as keys.
function deleteSelection(flags) {
	if (flags === undefined) {
		flags = {};
	}

	var blockMerging = "blockMerging" in flags ? Boolean(flags.blockMerging) : true;
	var stripWrappers = "stripWrappers" in flags ? Boolean(flags.stripWrappers) : true;
	var direction = "direction" in flags ? flags.direction : "forward";

	// "If the active range is null, abort these steps and do nothing."
	if (!getActiveRange()) {
		return;
	}

	// "Canonicalize whitespace at the active range's start."
	canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);

	// "Canonicalize whitespace at the active range's end."
	canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset);

	// "Let (start node, start offset) be the last equivalent point for the
	// active range's start."
	var start = getLastEquivalentPoint(getActiveRange().startContainer, getActiveRange().startOffset);
	var startNode = start[0];
	var startOffset = start[1];

	// "Let (end node, end offset) be the first equivalent point for the active
	// range's end."
	var end = getFirstEquivalentPoint(getActiveRange().endContainer, getActiveRange().endOffset);
	var endNode = end[0];
	var endOffset = end[1];

	// "If (end node, end offset) is not after (start node, start offset):"
	if (getPosition(endNode, endOffset, startNode, startOffset) !== "after") {
		// "If direction is "forward", call collapseToStart() on the context
		// object's Selection."
		//
		// Here and in a few other places, we check rangeCount to work around a
		// WebKit bug: it will sometimes incorrectly remove ranges from the
		// selection if nodes are removed, so collapseToStart() will throw.
		// This will break everything if we're using an actual selection, but
		// if getActiveRange() is really just returning globalRange and that's
		// all we care about, it will work fine.  I only add the extra check
		// for errors I actually hit in testing.
		if (direction == "forward") {
			if (getSelection().rangeCount) {
				getSelection().collapseToStart();
			}
			getActiveRange().collapse(true);

		// "Otherwise, call collapseToEnd() on the context object's Selection."
		} else {
			getSelection().collapseToEnd();
			getActiveRange().collapse(false);
		}

		// "Abort these steps."
		return;
	}

	// "If start node is a Text node and start offset is 0, set start offset to
	// the index of start node, then set start node to its parent."
	if (startNode.nodeType == Node.TEXT_NODE
	&& startOffset == 0) {
		startOffset = getNodeIndex(startNode);
		startNode = startNode.parentNode;
	}

	// "If end node is a Text node and end offset is its length, set end offset
	// to one plus the index of end node, then set end node to its parent."
	if (endNode.nodeType == Node.TEXT_NODE
	&& endOffset == getNodeLength(endNode)) {
		endOffset = 1 + getNodeIndex(endNode);
		endNode = endNode.parentNode;
	}

	// "Call collapse(start node, start offset) on the context object's
	// Selection."
	getSelection().collapse(startNode, startOffset);
	getActiveRange().setStart(startNode, startOffset);

	// "Call extend(end node, end offset) on the context object's Selection."
	getSelection().extend(endNode, endOffset);
	getActiveRange().setEnd(endNode, endOffset);

	// "Let start block be the active range's start node."
	var startBlock = getActiveRange().startContainer;

	// "While start block's parent is in the same editing host and start block
	// is an inline node, set start block to its parent."
	while (inSameEditingHost(startBlock, startBlock.parentNode)
	&& isInlineNode(startBlock)) {
		startBlock = startBlock.parentNode;
	}

	// "If start block is neither a block node nor an editing host, or "span"
	// is not an allowed child of start block, or start block is a td or th,
	// set start block to null."
	if ((!isBlockNode(startBlock) && !isEditingHost(startBlock))
	|| !isAllowedChild("span", startBlock)
	|| isHtmlElement(startBlock, ["td", "th"])) {
		startBlock = null;
	}

	// "Let end block be the active range's end node."
	var endBlock = getActiveRange().endContainer;

	// "While end block's parent is in the same editing host and end block is
	// an inline node, set end block to its parent."
	while (inSameEditingHost(endBlock, endBlock.parentNode)
	&& isInlineNode(endBlock)) {
		endBlock = endBlock.parentNode;
	}

	// "If end block is neither a block node nor an editing host, or "span" is
	// not an allowed child of end block, or end block is a td or th, set end
	// block to null."
	if ((!isBlockNode(endBlock) && !isEditingHost(endBlock))
	|| !isAllowedChild("span", endBlock)
	|| isHtmlElement(endBlock, ["td", "th"])) {
		endBlock = null;
	}

	// "Record current states and values, and let overrides be the result."
	var overrides = recordCurrentStatesAndValues();

	// "If start node and end node are the same, and start node is an editable
	// Text node:"
	if (startNode == endNode
	&& isEditable(startNode)
	&& startNode.nodeType == Node.TEXT_NODE) {
		// "Call deleteData(start offset, end offset − start offset) on start
		// node."
		startNode.deleteData(startOffset, endOffset - startOffset);

		// "Canonicalize whitespace at (start node, start offset), with fix
		// collapsed space false."
		canonicalizeWhitespace(startNode, startOffset, false);

		// "If direction is "forward", call collapseToStart() on the context
		// object's Selection."
		if (direction == "forward") {
			if (getSelection().rangeCount) {
				getSelection().collapseToStart();
			}
			getActiveRange().collapse(true);

		// "Otherwise, call collapseToEnd() on the context object's Selection."
		} else {
			getSelection().collapseToEnd();
			getActiveRange().collapse(false);
		}

		// "Restore states and values from overrides."
		restoreStatesAndValues(overrides);

		// "Abort these steps."
		return;
	}

	// "If start node is an editable Text node, call deleteData() on it, with
	// start offset as the first argument and (length of start node − start
	// offset) as the second argument."
	if (isEditable(startNode)
	&& startNode.nodeType == Node.TEXT_NODE) {
		startNode.deleteData(startOffset, getNodeLength(startNode) - startOffset);
	}

	// "Let node list be a list of nodes, initially empty."
	//
	// "For each node contained in the active range, append node to node list
	// if the last member of node list (if any) is not an ancestor of node;
	// node is editable; and node is not a thead, tbody, tfoot, tr, th, or td."
	var nodeList = getContainedNodes(getActiveRange(),
		function(node) {
			return isEditable(node)
				&& !isHtmlElement(node, ["thead", "tbody", "tfoot", "tr", "th", "td"]);
		}
	);

	// "For each node in node list:"
	for (var i = 0; i < nodeList.length; i++) {
		var node = nodeList[i];

		// "Let parent be the parent of node."
		var parent_ = node.parentNode;

		// "Remove node from parent."
		parent_.removeChild(node);

		// "If the block node of parent has no visible children, and parent is
		// editable or an editing host, call createElement("br") on the context
		// object and append the result as the last child of parent."
		if (![].some.call(getBlockNodeOf(parent_).childNodes, isVisible)
		&& (isEditable(parent_) || isEditingHost(parent_))) {
			parent_.appendChild(document.createElement("br"));
		}

		// "If strip wrappers is true or parent is not an ancestor container of
		// start node, while parent is an editable inline node with length 0,
		// let grandparent be the parent of parent, then remove parent from
		// grandparent, then set parent to grandparent."
		if (stripWrappers
		|| (!isAncestor(parent_, startNode) && parent_ != startNode)) {
			while (isEditable(parent_)
			&& isInlineNode(parent_)
			&& getNodeLength(parent_) == 0) {
				var grandparent = parent_.parentNode;
				grandparent.removeChild(parent_);
				parent_ = grandparent;
			}
		}
	}

	// "If end node is an editable Text node, call deleteData(0, end offset) on
	// it."
	if (isEditable(endNode)
	&& endNode.nodeType == Node.TEXT_NODE) {
		endNode.deleteData(0, endOffset);
	}

	// "Canonicalize whitespace at the active range's start, with fix collapsed
	// space false."
	canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);

	// "Canonicalize whitespace at the active range's end, with fix collapsed
	// space false."
	canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);

	// "If block merging is false, or start block or end block is null, or
	// start block is not in the same editing host as end block, or start block
	// and end block are the same:"
	if (!blockMerging
	|| !startBlock
	|| !endBlock
	|| !inSameEditingHost(startBlock, endBlock)
	|| startBlock == endBlock) {
		// "If direction is "forward", call collapseToStart() on the context
		// object's Selection."
		if (direction == "forward") {
			if (getSelection().rangeCount) {
				getSelection().collapseToStart();
			}
			getActiveRange().collapse(true);

		// "Otherwise, call collapseToEnd() on the context object's Selection."
		} else {
			if (getSelection().rangeCount) {
				getSelection().collapseToEnd();
			}
			getActiveRange().collapse(false);
		}

		// "Restore states and values from overrides."
		restoreStatesAndValues(overrides);

		// "Abort these steps."
		return;
	}

	// "If start block has one child, which is a collapsed block prop, remove
	// its child from it."
	if (startBlock.children.length == 1
	&& isCollapsedBlockProp(startBlock.firstChild)) {
		startBlock.removeChild(startBlock.firstChild);
	}

	// "If start block is an ancestor of end block:"
	if (isAncestor(startBlock, endBlock)) {
		// "Let reference node be end block."
		var referenceNode = endBlock;

		// "While reference node is not a child of start block, set reference
		// node to its parent."
		while (referenceNode.parentNode != startBlock) {
			referenceNode = referenceNode.parentNode;
		}

		// "Call collapse() on the context object's Selection, with first
		// argument start block and second argument the index of reference
		// node."
		getSelection().collapse(startBlock, getNodeIndex(referenceNode));
		getActiveRange().setStart(startBlock, getNodeIndex(referenceNode));
		getActiveRange().collapse(true);

		// "If end block has no children:"
		if (!endBlock.hasChildNodes()) {
			// "While end block is editable and is the only child of its parent
			// and is not a child of start block, let parent equal end block,
			// then remove end block from parent, then set end block to
			// parent."
			while (isEditable(endBlock)
			&& endBlock.parentNode.childNodes.length == 1
			&& endBlock.parentNode != startBlock) {
				var parent_ = endBlock;
				parent_.removeChild(endBlock);
				endBlock = parent_;
			}

			// "If end block is editable and is not an inline node, and its
			// previousSibling and nextSibling are both inline nodes, call
			// createElement("br") on the context object and insert it into end
			// block's parent immediately after end block."
			if (isEditable(endBlock)
			&& !isInlineNode(endBlock)
			&& isInlineNode(endBlock.previousSibling)
			&& isInlineNode(endBlock.nextSibling)) {
				endBlock.parentNode.insertBefore(document.createElement("br"), endBlock.nextSibling);
			}

			// "If end block is editable, remove it from its parent."
			if (isEditable(endBlock)) {
				endBlock.parentNode.removeChild(endBlock);
			}

			// "Restore states and values from overrides."
			restoreStatesAndValues(overrides);

			// "Abort these steps."
			return;
		}

		// "If end block's firstChild is not an inline node, restore states and
		// values from overrides, then abort these steps."
		if (!isInlineNode(endBlock.firstChild)) {
			restoreStatesAndValues(overrides);
			return;
		}

		// "Let children be a list of nodes, initially empty."
		var children = [];

		// "Append the first child of end block to children."
		children.push(endBlock.firstChild);

		// "While children's last member is not a br, and children's last
		// member's nextSibling is an inline node, append children's last
		// member's nextSibling to children."
		while (!isHtmlElement(children[children.length - 1], "br")
		&& isInlineNode(children[children.length - 1].nextSibling)) {
			children.push(children[children.length - 1].nextSibling);
		}

		// "Record the values of children, and let values be the result."
		var values = recordValues(children);

		// "While children's first member's parent is not start block, split
		// the parent of children."
		while (children[0].parentNode != startBlock) {
			splitParent(children);
		}

		// "If children's first member's previousSibling is an editable br,
		// remove that br from its parent."
		if (isEditable(children[0].previousSibling)
		&& isHtmlElement(children[0].previousSibling, "br")) {
			children[0].parentNode.removeChild(children[0].previousSibling);
		}

	// "Otherwise, if start block is a descendant of end block:"
	} else if (isDescendant(startBlock, endBlock)) {
		// "Call collapse() on the context object's Selection, with first
		// argument start block and second argument start block's length."
		getSelection().collapse(startBlock, getNodeLength(startBlock));
		getActiveRange().setStart(startBlock, getNodeLength(startBlock));
		getActiveRange().collapse(true);

		// "Let reference node be start block."
		var referenceNode = startBlock;

		// "While reference node is not a child of end block, set reference
		// node to its parent."
		while (referenceNode.parentNode != endBlock) {
			referenceNode = referenceNode.parentNode;
		}

		// "If reference node's nextSibling is an inline node and start block's
		// lastChild is a br, remove start block's lastChild from it."
		if (isInlineNode(referenceNode.nextSibling)
		&& isHtmlElement(startBlock.lastChild, "br")) {
			startBlock.removeChild(startBlock.lastChild);
		}

		// "Let nodes to move be a list of nodes, initially empty."
		var nodesToMove = [];

		// "If reference node's nextSibling is neither null nor a block node,
		// append it to nodes to move."
		if (referenceNode.nextSibling
		&& !isBlockNode(referenceNode.nextSibling)) {
			nodesToMove.push(referenceNode.nextSibling);
		}

		// "While nodes to move is nonempty and its last member isn't a br and
		// its last member's nextSibling is neither null nor a block node,
		// append its last member's nextSibling to nodes to move."
		if (nodesToMove.length
		&& !isHtmlElement(nodesToMove[nodesToMove.length - 1], "br")
		&& nodesToMove[nodesToMove.length - 1].nextSibling
		&& !isBlockNode(nodesToMove[nodesToMove.length - 1].nextSibling)) {
			nodesToMove.push(nodesToMove[nodesToMove.length - 1].nextSibling);
		}

		// "Record the values of nodes to move, and let values be the result."
		var values = recordValues(nodesToMove);

		// "For each node in nodes to move, append node as the last child of
		// start block, preserving ranges."
		nodesToMove.forEach(function(node) {
			movePreservingRanges(node, startBlock, -1);
		});

	// "Otherwise:"
	} else {
		// "Call collapse() on the context object's Selection, with first
		// argument start block and second argument start block's length."
		getSelection().collapse(startBlock, getNodeLength(startBlock));
		getActiveRange().setStart(startBlock, getNodeLength(startBlock));
		getActiveRange().collapse(true);

		// "If end block's firstChild is an inline node and start block's
		// lastChild is a br, remove start block's lastChild from it."
		if (isInlineNode(endBlock.firstChild)
		&& isHtmlElement(startBlock.lastChild, "br")) {
			startBlock.removeChild(startBlock.lastChild);
		}

		// "Record the values of end block's children, and let values be the
		// result."
		var values = recordValues([].slice.call(endBlock.childNodes));

		// "While end block has children, append the first child of end block
		// to start block, preserving ranges."
		while (endBlock.hasChildNodes()) {
			movePreservingRanges(endBlock.firstChild, startBlock, -1);
		}

		// "While end block has no children, let parent be the parent of end
		// block, then remove end block from parent, then set end block to
		// parent."
		while (!endBlock.hasChildNodes()) {
			var parent_ = endBlock.parentNode;
			parent_.removeChild(endBlock);
			endBlock = parent_;
		}
	}

	// "Let ancestor be start block."
	var ancestor = startBlock;

	// "While ancestor has an inclusive ancestor ol in the same editing host
	// whose nextSibling is also an ol in the same editing host, or an
	// inclusive ancestor ul in the same editing host whose nextSibling is also
	// a ul in the same editing host:"
	while (getInclusiveAncestors(ancestor).some(function(node) {
		return inSameEditingHost(ancestor, node)
			&& (
				(isHtmlElement(node, "ol") && isHtmlElement(node.nextSibling, "ol"))
				|| (isHtmlElement(node, "ul") && isHtmlElement(node.nextSibling, "ul"))
			) && inSameEditingHost(ancestor, node.nextSibling);
	})) {
		// "While ancestor and its nextSibling are not both ols in the same
		// editing host, and are also not both uls in the same editing host,
		// set ancestor to its parent."
		while (!(
			isHtmlElement(ancestor, "ol")
			&& isHtmlElement(ancestor.nextSibling, "ol")
			&& inSameEditingHost(ancestor, ancestor.nextSibling)
		) && !(
			isHtmlElement(ancestor, "ul")
			&& isHtmlElement(ancestor.nextSibling, "ul")
			&& inSameEditingHost(ancestor, ancestor.nextSibling)
		)) {
			ancestor = ancestor.parentNode;
		}

		// "While ancestor's nextSibling has children, append ancestor's
		// nextSibling's firstChild as the last child of ancestor, preserving
		// ranges."
		while (ancestor.nextSibling.hasChildNodes()) {
			movePreservingRanges(ancestor.nextSibling.firstChild, ancestor, -1);
		}

		// "Remove ancestor's nextSibling from its parent."
		ancestor.parentNode.removeChild(ancestor.nextSibling);
	}

	// "Restore the values from values."
	restoreValues(values);

	// "If start block has no children, call createElement("br") on the context
	// object and append the result as the last child of start block."
	if (!startBlock.hasChildNodes()) {
		startBlock.appendChild(document.createElement("br"));
	}

	// "Remove extraneous line breaks at the end of start block."
	removeExtraneousLineBreaksAtTheEndOf(startBlock);

	// "Restore states and values from overrides."
	restoreStatesAndValues(overrides);
}


//@}
///// Splitting a node list's parent /////
//@{

function splitParent(nodeList) {
	// "Let original parent be the parent of the first member of node list."
	var originalParent = nodeList[0].parentNode;

	// "If original parent is not editable or its parent is null, do nothing
	// and abort these steps."
	if (!isEditable(originalParent)
	|| !originalParent.parentNode) {
		return;
	}

	// "If the first child of original parent is in node list, remove
	// extraneous line breaks before original parent."
	if (nodeList.indexOf(originalParent.firstChild) != -1) {
		removeExtraneousLineBreaksBefore(originalParent);
	}

	// "If the first child of original parent is in node list, and original
	// parent follows a line break, set follows line break to true. Otherwise,
	// set follows line break to false."
	var followsLineBreak_ = nodeList.indexOf(originalParent.firstChild) != -1
		&& followsLineBreak(originalParent);

	// "If the last child of original parent is in node list, and original
	// parent precedes a line break, set precedes line break to true.
	// Otherwise, set precedes line break to false."
	var precedesLineBreak_ = nodeList.indexOf(originalParent.lastChild) != -1
		&& precedesLineBreak(originalParent);

	// "If the first child of original parent is not in node list, but its last
	// child is:"
	if (nodeList.indexOf(originalParent.firstChild) == -1
	&& nodeList.indexOf(originalParent.lastChild) != -1) {
		// "For each node in node list, in reverse order, insert node into the
		// parent of original parent immediately after original parent,
		// preserving ranges."
		for (var i = nodeList.length - 1; i >= 0; i--) {
			movePreservingRanges(nodeList[i], originalParent.parentNode, 1 + getNodeIndex(originalParent));
		}

		// "If precedes line break is true, and the last member of node list
		// does not precede a line break, call createElement("br") on the
		// context object and insert the result immediately after the last
		// member of node list."
		if (precedesLineBreak_
		&& !precedesLineBreak(nodeList[nodeList.length - 1])) {
			nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
		}

		// "Remove extraneous line breaks at the end of original parent."
		removeExtraneousLineBreaksAtTheEndOf(originalParent);

		// "Abort these steps."
		return;
	}

	// "If the first child of original parent is not in node list:"
	if (nodeList.indexOf(originalParent.firstChild) == -1) {
		// "Let cloned parent be the result of calling cloneNode(false) on
		// original parent."
		var clonedParent = originalParent.cloneNode(false);

		// "If original parent has an id attribute, unset it."
		originalParent.removeAttribute("id");

		// "Insert cloned parent into the parent of original parent immediately
		// before original parent."
		originalParent.parentNode.insertBefore(clonedParent, originalParent);

		// "While the previousSibling of the first member of node list is not
		// null, append the first child of original parent as the last child of
		// cloned parent, preserving ranges."
		while (nodeList[0].previousSibling) {
			movePreservingRanges(originalParent.firstChild, clonedParent, clonedParent.childNodes.length);
		}
	}

	// "For each node in node list, insert node into the parent of original
	// parent immediately before original parent, preserving ranges."
	for (var i = 0; i < nodeList.length; i++) {
		movePreservingRanges(nodeList[i], originalParent.parentNode, getNodeIndex(originalParent));
	}

	// "If follows line break is true, and the first member of node list does
	// not follow a line break, call createElement("br") on the context object
	// and insert the result immediately before the first member of node list."
	if (followsLineBreak_
	&& !followsLineBreak(nodeList[0])) {
		nodeList[0].parentNode.insertBefore(document.createElement("br"), nodeList[0]);
	}

	// "If the last member of node list is an inline node other than a br, and
	// the first child of original parent is a br, and original parent is not
	// an inline node, remove the first child of original parent from original
	// parent."
	if (isInlineNode(nodeList[nodeList.length - 1])
	&& !isHtmlElement(nodeList[nodeList.length - 1], "br")
	&& isHtmlElement(originalParent.firstChild, "br")
	&& !isInlineNode(originalParent)) {
		originalParent.removeChild(originalParent.firstChild);
	}

	// "If original parent has no children:"
	if (!originalParent.hasChildNodes()) {
		// "Remove original parent from its parent."
		originalParent.parentNode.removeChild(originalParent);

		// "If precedes line break is true, and the last member of node list
		// does not precede a line break, call createElement("br") on the
		// context object and insert the result immediately after the last
		// member of node list."
		if (precedesLineBreak_
		&& !precedesLineBreak(nodeList[nodeList.length - 1])) {
			nodeList[nodeList.length - 1].parentNode.insertBefore(document.createElement("br"), nodeList[nodeList.length - 1].nextSibling);
		}

	// "Otherwise, remove extraneous line breaks before original parent."
	} else {
		removeExtraneousLineBreaksBefore(originalParent);
	}

	// "If node list's last member's nextSibling is null, but its parent is not
	// null, remove extraneous line breaks at the end of node list's last
	// member's parent."
	if (!nodeList[nodeList.length - 1].nextSibling
	&& nodeList[nodeList.length - 1].parentNode) {
		removeExtraneousLineBreaksAtTheEndOf(nodeList[nodeList.length - 1].parentNode);
	}
}

// "To remove a node node while preserving its descendants, split the parent of
// node's children if it has any. If it has no children, instead remove it from
// its parent."
function removePreservingDescendants(node) {
	if (node.hasChildNodes()) {
		splitParent([].slice.call(node.childNodes));
	} else {
		node.parentNode.removeChild(node);
	}
}


//@}
///// Canonical space sequences /////
//@{

function canonicalSpaceSequence(n, nonBreakingStart, nonBreakingEnd) {
	// "If n is zero, return the empty string."
	if (n == 0) {
		return "";
	}

	// "If n is one and both non-breaking start and non-breaking end are false,
	// return a single space (U+0020)."
	if (n == 1 && !nonBreakingStart && !nonBreakingEnd) {
		return " ";
	}

	// "If n is one, return a single non-breaking space (U+00A0)."
	if (n == 1) {
		return "\xa0";
	}

	// "Let buffer be the empty string."
	var buffer = "";

	// "If non-breaking start is true, let repeated pair be U+00A0 U+0020.
	// Otherwise, let it be U+0020 U+00A0."
	var repeatedPair;
	if (nonBreakingStart) {
		repeatedPair = "\xa0 ";
	} else {
		repeatedPair = " \xa0";
	}

	// "While n is greater than three, append repeated pair to buffer and
	// subtract two from n."
	while (n > 3) {
		buffer += repeatedPair;
		n -= 2;
	}

	// "If n is three, append a three-element string to buffer depending on
	// non-breaking start and non-breaking end:"
	if (n == 3) {
		buffer +=
			!nonBreakingStart && !nonBreakingEnd ? " \xa0 "
			: nonBreakingStart && !nonBreakingEnd ? "\xa0\xa0 "
			: !nonBreakingStart && nonBreakingEnd ? " \xa0\xa0"
			: nonBreakingStart && nonBreakingEnd ? "\xa0 \xa0"
			: "impossible";

	// "Otherwise, append a two-element string to buffer depending on
	// non-breaking start and non-breaking end:"
	} else {
		buffer +=
			!nonBreakingStart && !nonBreakingEnd ? "\xa0 "
			: nonBreakingStart && !nonBreakingEnd ? "\xa0 "
			: !nonBreakingStart && nonBreakingEnd ? " \xa0"
			: nonBreakingStart && nonBreakingEnd ? "\xa0\xa0"
			: "impossible";
	}

	// "Return buffer."
	return buffer;
}

function canonicalizeWhitespace(node, offset, fixCollapsedSpace) {
	if (fixCollapsedSpace === undefined) {
		// "an optional boolean argument fix collapsed space that defaults to
		// true"
		fixCollapsedSpace = true;
	}

	// "If node is neither editable nor an editing host, abort these steps."
	if (!isEditable(node) && !isEditingHost(node)) {
		return;
	}

	// "Let start node equal node and let start offset equal offset."
	var startNode = node;
	var startOffset = offset;

	// "Repeat the following steps:"
	while (true) {
		// "If start node has a child in the same editing host with index start
		// offset minus one, set start node to that child, then set start
		// offset to start node's length."
		if (0 <= startOffset - 1
		&& inSameEditingHost(startNode, startNode.childNodes[startOffset - 1])) {
			startNode = startNode.childNodes[startOffset - 1];
			startOffset = getNodeLength(startNode);

		// "Otherwise, if start offset is zero and start node does not follow a
		// line break and start node's parent is in the same editing host, set
		// start offset to start node's index, then set start node to its
		// parent."
		} else if (startOffset == 0
		&& !followsLineBreak(startNode)
		&& inSameEditingHost(startNode, startNode.parentNode)) {
			startOffset = getNodeIndex(startNode);
			startNode = startNode.parentNode;

		// "Otherwise, if start node is a Text node and its parent's resolved
		// value for "white-space" is neither "pre" nor "pre-wrap" and start
		// offset is not zero and the (start offset − 1)st element of start
		// node's data is a space (0x0020) or non-breaking space (0x00A0),
		// subtract one from start offset."
		} else if (startNode.nodeType == Node.TEXT_NODE
		&& ["pre", "pre-wrap"].indexOf(getComputedStyle(startNode.parentNode).whiteSpace) == -1
		&& startOffset != 0
		&& /[ \xa0]/.test(startNode.data[startOffset - 1])) {
			startOffset--;

		// "Otherwise, break from this loop."
		} else {
			break;
		}
	}

	// "Let end node equal start node and end offset equal start offset."
	var endNode = startNode;
	var endOffset = startOffset;

	// "Let length equal zero."
	var length = 0;

	// "Let collapse spaces be true if start offset is zero and start node
	// follows a line break, otherwise false."
	var collapseSpaces = startOffset == 0 && followsLineBreak(startNode);

	// "Repeat the following steps:"
	while (true) {
		// "If end node has a child in the same editing host with index end
		// offset, set end node to that child, then set end offset to zero."
		if (endOffset < endNode.childNodes.length
		&& inSameEditingHost(endNode, endNode.childNodes[endOffset])) {
			endNode = endNode.childNodes[endOffset];
			endOffset = 0;

		// "Otherwise, if end offset is end node's length and end node does not
		// precede a line break and end node's parent is in the same editing
		// host, set end offset to one plus end node's index, then set end node
		// to its parent."
		} else if (endOffset == getNodeLength(endNode)
		&& !precedesLineBreak(endNode)
		&& inSameEditingHost(endNode, endNode.parentNode)) {
			endOffset = 1 + getNodeIndex(endNode);
			endNode = endNode.parentNode;

		// "Otherwise, if end node is a Text node and its parent's resolved
		// value for "white-space" is neither "pre" nor "pre-wrap" and end
		// offset is not end node's length and the end offsetth element of
		// end node's data is a space (0x0020) or non-breaking space (0x00A0):"
		} else if (endNode.nodeType == Node.TEXT_NODE
		&& ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
		&& endOffset != getNodeLength(endNode)
		&& /[ \xa0]/.test(endNode.data[endOffset])) {
			// "If fix collapsed space is true, and collapse spaces is true,
			// and the end offsetth code unit of end node's data is a space
			// (0x0020): call deleteData(end offset, 1) on end node, then
			// continue this loop from the beginning."
			if (fixCollapsedSpace
			&& collapseSpaces
			&& " " == endNode.data[endOffset]) {
				endNode.deleteData(endOffset, 1);
				continue;
			}

			// "Set collapse spaces to true if the end offsetth element of end
			// node's data is a space (0x0020), false otherwise."
			collapseSpaces = " " == endNode.data[endOffset];

			// "Add one to end offset."
			endOffset++;

			// "Add one to length."
			length++;

		// "Otherwise, break from this loop."
		} else {
			break;
		}
	}

	// "If fix collapsed space is true, then while (start node, start offset)
	// is before (end node, end offset):"
	if (fixCollapsedSpace) {
		while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
			// "If end node has a child in the same editing host with index end
			// offset − 1, set end node to that child, then set end offset to end
			// node's length."
			if (0 <= endOffset - 1
			&& endOffset - 1 < endNode.childNodes.length
			&& inSameEditingHost(endNode, endNode.childNodes[endOffset - 1])) {
				endNode = endNode.childNodes[endOffset - 1];
				endOffset = getNodeLength(endNode);

			// "Otherwise, if end offset is zero and end node's parent is in the
			// same editing host, set end offset to end node's index, then set end
			// node to its parent."
			} else if (endOffset == 0
			&& inSameEditingHost(endNode, endNode.parentNode)) {
				endOffset = getNodeIndex(endNode);
				endNode = endNode.parentNode;

			// "Otherwise, if end node is a Text node and its parent's resolved
			// value for "white-space" is neither "pre" nor "pre-wrap" and end
			// offset is end node's length and the last code unit of end node's
			// data is a space (0x0020) and end node precedes a line break:"
			} else if (endNode.nodeType == Node.TEXT_NODE
			&& ["pre", "pre-wrap"].indexOf(getComputedStyle(endNode.parentNode).whiteSpace) == -1
			&& endOffset == getNodeLength(endNode)
			&& endNode.data[endNode.data.length - 1] == " "
			&& precedesLineBreak(endNode)) {
				// "Subtract one from end offset."
				endOffset--;

				// "Subtract one from length."
				length--;

				// "Call deleteData(end offset, 1) on end node."
				endNode.deleteData(endOffset, 1);

			// "Otherwise, break from this loop."
			} else {
				break;
			}
		}
	}

	// "Let replacement whitespace be the canonical space sequence of length
	// length. non-breaking start is true if start offset is zero and start
	// node follows a line break, and false otherwise. non-breaking end is true
	// if end offset is end node's length and end node precedes a line break,
	// and false otherwise."
	var replacementWhitespace = canonicalSpaceSequence(length,
		startOffset == 0 && followsLineBreak(startNode),
		endOffset == getNodeLength(endNode) && precedesLineBreak(endNode));

	// "While (start node, start offset) is before (end node, end offset):"
	while (getPosition(startNode, startOffset, endNode, endOffset) == "before") {
		// "If start node has a child with index start offset, set start node
		// to that child, then set start offset to zero."
		if (startOffset < startNode.childNodes.length) {
			startNode = startNode.childNodes[startOffset];
			startOffset = 0;

		// "Otherwise, if start node is not a Text node or if start offset is
		// start node's length, set start offset to one plus start node's
		// index, then set start node to its parent."
		} else if (startNode.nodeType != Node.TEXT_NODE
		|| startOffset == getNodeLength(startNode)) {
			startOffset = 1 + getNodeIndex(startNode);
			startNode = startNode.parentNode;

		// "Otherwise:"
		} else {
			// "Remove the first element from replacement whitespace, and let
			// element be that element."
			var element = replacementWhitespace[0];
			replacementWhitespace = replacementWhitespace.slice(1);

			// "If element is not the same as the start offsetth element of
			// start node's data:"
			if (element != startNode.data[startOffset]) {
				// "Call insertData(start offset, element) on start node."
				startNode.insertData(startOffset, element);

				// "Call deleteData(start offset + 1, 1) on start node."
				startNode.deleteData(startOffset + 1, 1);
			}

			// "Add one to start offset."
			startOffset++;
		}
	}
}


//@}
///// Indenting and outdenting /////
//@{

function indentNodes(nodeList) {
	// "If node list is empty, do nothing and abort these steps."
	if (!nodeList.length) {
		return;
	}

	// "Let first node be the first member of node list."
	var firstNode = nodeList[0];

	// "If first node's parent is an ol or ul:"
	if (isHtmlElement(firstNode.parentNode, ["OL", "UL"])) {
		// "Let tag be the local name of the parent of first node."
		var tag = firstNode.parentNode.tagName;

		// "Wrap node list, with sibling criteria returning true for an HTML
		// element with local name tag and false otherwise, and new parent
		// instructions returning the result of calling createElement(tag) on
		// the ownerDocument of first node."
		wrap(nodeList,
			function(node) { return isHtmlElement(node, tag) },
			function() { return firstNode.ownerDocument.createElement(tag) });

		// "Abort these steps."
		return;
	}

	// "Wrap node list, with sibling criteria returning true for a simple
	// indentation element and false otherwise, and new parent instructions
	// returning the result of calling createElement("blockquote") on the
	// ownerDocument of first node. Let new parent be the result."
	var newParent = wrap(nodeList,
		function(node) { return isSimpleIndentationElement(node) },
		function() { return firstNode.ownerDocument.createElement("blockquote") });

	// "Fix disallowed ancestors of new parent."
	fixDisallowedAncestors(newParent);
}

function outdentNode(node) {
	// "If node is not editable, abort these steps."
	if (!isEditable(node)) {
		return;
	}

	// "If node is a simple indentation element, remove node, preserving its
	// descendants.  Then abort these steps."
	if (isSimpleIndentationElement(node)) {
		removePreservingDescendants(node);
		return;
	}

	// "If node is an indentation element:"
	if (isIndentationElement(node)) {
		// "Unset the dir attribute of node, if any."
		node.removeAttribute("dir");

		// "Unset the margin, padding, and border CSS properties of node."
		node.style.margin = "";
		node.style.padding = "";
		node.style.border = "";
		if (node.getAttribute("style") == ""
		// Crazy WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=68551
		|| node.getAttribute("style") == "border-width: initial; border-color: initial; ") {
			node.removeAttribute("style");
		}

		// "Set the tag name of node to "div"."
		setTagName(node, "div");

		// "Abort these steps."
		return;
	}

	// "Let current ancestor be node's parent."
	var currentAncestor = node.parentNode;

	// "Let ancestor list be a list of nodes, initially empty."
	var ancestorList = [];

	// "While current ancestor is an editable Element that is neither a simple
	// indentation element nor an ol nor a ul, append current ancestor to
	// ancestor list and then set current ancestor to its parent."
	while (isEditable(currentAncestor)
	&& currentAncestor.nodeType == Node.ELEMENT_NODE
	&& !isSimpleIndentationElement(currentAncestor)
	&& !isHtmlElement(currentAncestor, ["ol", "ul"])) {
		ancestorList.push(currentAncestor);
		currentAncestor = currentAncestor.parentNode;
	}

	// "If current ancestor is not an editable simple indentation element:"
	if (!isEditable(currentAncestor)
	|| !isSimpleIndentationElement(currentAncestor)) {
		// "Let current ancestor be node's parent."
		currentAncestor = node.parentNode;

		// "Let ancestor list be the empty list."
		ancestorList = [];

		// "While current ancestor is an editable Element that is neither an
		// indentation element nor an ol nor a ul, append current ancestor to
		// ancestor list and then set current ancestor to its parent."
		while (isEditable(currentAncestor)
		&& currentAncestor.nodeType == Node.ELEMENT_NODE
		&& !isIndentationElement(currentAncestor)
		&& !isHtmlElement(currentAncestor, ["ol", "ul"])) {
			ancestorList.push(currentAncestor);
			currentAncestor = currentAncestor.parentNode;
		}
	}

	// "If node is an ol or ul and current ancestor is not an editable
	// indentation element:"
	if (isHtmlElement(node, ["OL", "UL"])
	&& (!isEditable(currentAncestor)
	|| !isIndentationElement(currentAncestor))) {
		// "Unset the reversed, start, and type attributes of node, if any are
		// set."
		node.removeAttribute("reversed");
		node.removeAttribute("start");
		node.removeAttribute("type");

		// "Let children be the children of node."
		var children = [].slice.call(node.childNodes);

		// "If node has attributes, and its parent is not an ol or ul, set the
		// tag name of node to "div"."
		if (node.attributes.length
		&& !isHtmlElement(node.parentNode, ["OL", "UL"])) {
			setTagName(node, "div");

		// "Otherwise:"
		} else {
			// "Record the values of node's children, and let values be the
			// result."
			var values = recordValues([].slice.call(node.childNodes));

			// "Remove node, preserving its descendants."
			removePreservingDescendants(node);

			// "Restore the values from values."
			restoreValues(values);
		}

		// "Fix disallowed ancestors of each member of children."
		for (var i = 0; i < children.length; i++) {
			fixDisallowedAncestors(children[i]);
		}

		// "Abort these steps."
		return;
	}

	// "If current ancestor is not an editable indentation element, abort these
	// steps."
	if (!isEditable(currentAncestor)
	|| !isIndentationElement(currentAncestor)) {
		return;
	}

	// "Append current ancestor to ancestor list."
	ancestorList.push(currentAncestor);

	// "Let original ancestor be current ancestor."
	var originalAncestor = currentAncestor;

	// "While ancestor list is not empty:"
	while (ancestorList.length) {
		// "Let current ancestor be the last member of ancestor list."
		//
		// "Remove the last member of ancestor list."
		currentAncestor = ancestorList.pop();

		// "Let target be the child of current ancestor that is equal to either
		// node or the last member of ancestor list."
		var target = node.parentNode == currentAncestor
			? node
			: ancestorList[ancestorList.length - 1];

		// "If target is an inline node that is not a br, and its nextSibling
		// is a br, remove target's nextSibling from its parent."
		if (isInlineNode(target)
		&& !isHtmlElement(target, "BR")
		&& isHtmlElement(target.nextSibling, "BR")) {
			target.parentNode.removeChild(target.nextSibling);
		}

		// "Let preceding siblings be the preceding siblings of target, and let
		// following siblings be the following siblings of target."
		var precedingSiblings = [].slice.call(currentAncestor.childNodes, 0, getNodeIndex(target));
		var followingSiblings = [].slice.call(currentAncestor.childNodes, 1 + getNodeIndex(target));

		// "Indent preceding siblings."
		indentNodes(precedingSiblings);

		// "Indent following siblings."
		indentNodes(followingSiblings);
	}

	// "Outdent original ancestor."
	outdentNode(originalAncestor);
}


//@}
///// Toggling lists /////
//@{

function toggleLists(tagName) {
	// "Let mode be "disable" if the selection's list state is tag name, and
	// "enable" otherwise."
	var mode = getSelectionListState() == tagName ? "disable" : "enable";

	var range = getActiveRange();
	tagName = tagName.toUpperCase();

	// "Let other tag name be "ol" if tag name is "ul", and "ul" if tag name is
	// "ol"."
	var otherTagName = tagName == "OL" ? "UL" : "OL";

	// "Let items be a list of all lis that are ancestor containers of the
	// range's start and/or end node."
	//
	// It's annoying to get this in tree order using functional stuff without
	// doing getDescendants(document), which is slow, so I do it imperatively.
	var items = [];
	(function(){
		for (
			var ancestorContainer = range.endContainer;
			ancestorContainer != range.commonAncestorContainer;
			ancestorContainer = ancestorContainer.parentNode
		) {
			if (isHtmlElement(ancestorContainer, "li")) {
				items.unshift(ancestorContainer);
			}
		}
		for (
			var ancestorContainer = range.startContainer;
			ancestorContainer;
			ancestorContainer = ancestorContainer.parentNode
		) {
			if (isHtmlElement(ancestorContainer, "li")) {
				items.unshift(ancestorContainer);
			}
		}
	})();

	// "For each item in items, normalize sublists of item."
	items.forEach(normalizeSublists);

	// "Block-extend the range, and let new range be the result."
	var newRange = blockExtend(range);

	// "If mode is "enable", then let lists to convert consist of every
	// editable HTML element with local name other tag name that is contained
	// in new range, and for every list in lists to convert:"
	if (mode == "enable") {
		getAllContainedNodes(newRange, function(node) {
			return isEditable(node)
				&& isHtmlElement(node, otherTagName);
		}).forEach(function(list) {
			// "If list's previousSibling or nextSibling is an editable HTML
			// element with local name tag name:"
			if ((isEditable(list.previousSibling) && isHtmlElement(list.previousSibling, tagName))
			|| (isEditable(list.nextSibling) && isHtmlElement(list.nextSibling, tagName))) {
				// "Let children be list's children."
				var children = [].slice.call(list.childNodes);

				// "Record the values of children, and let values be the
				// result."
				var values = recordValues(children);

				// "Split the parent of children."
				splitParent(children);

				// "Wrap children, with sibling criteria returning true for an
				// HTML element with local name tag name and false otherwise."
				wrap(children, function(node) { return isHtmlElement(node, tagName) });

				// "Restore the values from values."
				restoreValues(values);

			// "Otherwise, set the tag name of list to tag name."
			} else {
				setTagName(list, tagName);
			}
		});
	}

	// "Let node list be a list of nodes, initially empty."
	//
	// "For each node node contained in new range, if node is editable; the
	// last member of node list (if any) is not an ancestor of node; node
	// is not an indentation element; and either node is an ol or ul, or its
	// parent is an ol or ul, or it is an allowed child of "li"; then append
	// node to node list."
	var nodeList = getContainedNodes(newRange, function(node) {
		return isEditable(node)
		&& !isIndentationElement(node)
		&& (isHtmlElement(node, ["OL", "UL"])
		|| isHtmlElement(node.parentNode, ["OL", "UL"])
		|| isAllowedChild(node, "li"));
	});

	// "If mode is "enable", remove from node list any ol or ul whose parent is
	// not also an ol or ul."
	if (mode == "enable") {
		nodeList = nodeList.filter(function(node) {
			return !isHtmlElement(node, ["ol", "ul"])
				|| isHtmlElement(node.parentNode, ["ol", "ul"]);
		});
	}

	// "If mode is "disable", then while node list is not empty:"
	if (mode == "disable") {
		while (nodeList.length) {
			// "Let sublist be an empty list of nodes."
			var sublist = [];

			// "Remove the first member from node list and append it to
			// sublist."
			sublist.push(nodeList.shift());

			// "If the first member of sublist is an HTML element with local
			// name tag name, outdent it and continue this loop from the
			// beginning."
			if (isHtmlElement(sublist[0], tagName)) {
				outdentNode(sublist[0]);
				continue;
			}

			// "While node list is not empty, and the first member of node list
			// is the nextSibling of the last member of sublist and is not an
			// HTML element with local name tag name, remove the first member
			// from node list and append it to sublist."
			while (nodeList.length
			&& nodeList[0] == sublist[sublist.length - 1].nextSibling
			&& !isHtmlElement(nodeList[0], tagName)) {
				sublist.push(nodeList.shift());
			}

			// "Record the values of sublist, and let values be the result."
			var values = recordValues(sublist);

			// "Split the parent of sublist."
			splitParent(sublist);

			// "Fix disallowed ancestors of each member of sublist."
			for (var i = 0; i < sublist.length; i++) {
				fixDisallowedAncestors(sublist[i]);
			}

			// "Restore the values from values."
			restoreValues(values);
		}

	// "Otherwise, while node list is not empty:"
	} else {
		while (nodeList.length) {
			// "Let sublist be an empty list of nodes."
			var sublist = [];

			// "While either sublist is empty, or node list is not empty and
			// its first member is the nextSibling of sublist's last member:"
			while (!sublist.length
			|| (nodeList.length
			&& nodeList[0] == sublist[sublist.length - 1].nextSibling)) {
				// "If node list's first member is a p or div, set the tag name
				// of node list's first member to "li", and append the result
				// to sublist. Remove the first member from node list."
				if (isHtmlElement(nodeList[0], ["p", "div"])) {
					sublist.push(setTagName(nodeList[0], "li"));
					nodeList.shift();

				// "Otherwise, if the first member of node list is an li or ol
				// or ul, remove it from node list and append it to sublist."
				} else if (isHtmlElement(nodeList[0], ["li", "ol", "ul"])) {
					sublist.push(nodeList.shift());

				// "Otherwise:"
				} else {
					// "Let nodes to wrap be a list of nodes, initially empty."
					var nodesToWrap = [];

					// "While nodes to wrap is empty, or node list is not empty
					// and its first member is the nextSibling of nodes to
					// wrap's last member and the first member of node list is
					// an inline node and the last member of nodes to wrap is
					// an inline node other than a br, remove the first member
					// from node list and append it to nodes to wrap."
					while (!nodesToWrap.length
					|| (nodeList.length
					&& nodeList[0] == nodesToWrap[nodesToWrap.length - 1].nextSibling
					&& isInlineNode(nodeList[0])
					&& isInlineNode(nodesToWrap[nodesToWrap.length - 1])
					&& !isHtmlElement(nodesToWrap[nodesToWrap.length - 1], "br"))) {
						nodesToWrap.push(nodeList.shift());
					}

					// "Wrap nodes to wrap, with new parent instructions
					// returning the result of calling createElement("li") on
					// the context object. Append the result to sublist."
					sublist.push(wrap(nodesToWrap,
						undefined,
						function() { return document.createElement("li") }));
				}
			}

			// "If sublist's first member's parent is an HTML element with
			// local name tag name, or if every member of sublist is an ol or
			// ul, continue this loop from the beginning."
			if (isHtmlElement(sublist[0].parentNode, tagName)
			|| sublist.every(function(node) { return isHtmlElement(node, ["ol", "ul"]) })) {
				continue;
			}

			// "If sublist's first member's parent is an HTML element with
			// local name other tag name:"
			if (isHtmlElement(sublist[0].parentNode, otherTagName)) {
				// "Record the values of sublist, and let values be the
				// result."
				var values = recordValues(sublist);

				// "Split the parent of sublist."
				splitParent(sublist);

				// "Wrap sublist, with sibling criteria returning true for an
				// HTML element with local name tag name and false otherwise,
				// and new parent instructions returning the result of calling
				// createElement(tag name) on the context object."
				wrap(sublist,
					function(node) { return isHtmlElement(node, tagName) },
					function() { return document.createElement(tagName) });

				// "Restore the values from values."
				restoreValues(values);

				// "Continue this loop from the beginning."
				continue;
			}

			// "Wrap sublist, with sibling criteria returning true for an HTML
			// element with local name tag name and false otherwise, and new
			// parent instructions being the following:"
			// . . .
			// "Fix disallowed ancestors of the previous step's result."
			fixDisallowedAncestors(wrap(sublist,
				function(node) { return isHtmlElement(node, tagName) },
				function() {
					// "If sublist's first member's parent is not an editable
					// simple indentation element, or sublist's first member's
					// parent's previousSibling is not an editable HTML element
					// with local name tag name, call createElement(tag name)
					// on the context object and return the result."
					if (!isEditable(sublist[0].parentNode)
					|| !isSimpleIndentationElement(sublist[0].parentNode)
					|| !isEditable(sublist[0].parentNode.previousSibling)
					|| !isHtmlElement(sublist[0].parentNode.previousSibling, tagName)) {
						return document.createElement(tagName);
					}

					// "Let list be sublist's first member's parent's
					// previousSibling."
					var list = sublist[0].parentNode.previousSibling;

					// "Normalize sublists of list's lastChild."
					normalizeSublists(list.lastChild);

					// "If list's lastChild is not an editable HTML element
					// with local name tag name, call createElement(tag name)
					// on the context object, and append the result as the last
					// child of list."
					if (!isEditable(list.lastChild)
					|| !isHtmlElement(list.lastChild, tagName)) {
						list.appendChild(document.createElement(tagName));
					}

					// "Return the last child of list."
					return list.lastChild;
				}
			));
		}
	}
}


//@}
///// Justifying the selection /////
//@{

function justifySelection(alignment) {
	// "Block-extend the active range, and let new range be the result."
	var newRange = blockExtend(globalRange);

	// "Let element list be a list of all editable Elements contained in new
	// range that either has an attribute in the HTML namespace whose local
	// name is "align", or has a style attribute that sets "text-align", or is
	// a center."
	var elementList = getAllContainedNodes(newRange, function(node) {
		return node.nodeType == Node.ELEMENT_NODE
			&& isEditable(node)
			// Ignoring namespaces here
			&& (
				node.hasAttribute("align")
				|| node.style.textAlign != ""
				|| isHtmlElement(node, "center")
			);
	});

	// "For each element in element list:"
	for (var i = 0; i < elementList.length; i++) {
		var element = elementList[i];

		// "If element has an attribute in the HTML namespace whose local name
		// is "align", remove that attribute."
		element.removeAttribute("align");

		// "Unset the CSS property "text-align" on element, if it's set by a
		// style attribute."
		element.style.textAlign = "";
		if (element.getAttribute("style") == "") {
			element.removeAttribute("style");
		}

		// "If element is a div or span or center with no attributes, remove
		// it, preserving its descendants."
		if (isHtmlElement(element, ["div", "span", "center"])
		&& !element.attributes.length) {
			removePreservingDescendants(element);
		}

		// "If element is a center with one or more attributes, set the tag
		// name of element to "div"."
		if (isHtmlElement(element, "center")
		&& element.attributes.length) {
			setTagName(element, "div");
		}
	}

	// "Block-extend the active range, and let new range be the result."
	newRange = blockExtend(globalRange);

	// "Let node list be a list of nodes, initially empty."
	var nodeList = [];

	// "For each node node contained in new range, append node to node list if
	// the last member of node list (if any) is not an ancestor of node; node
	// is editable; node is an allowed child of "div"; and node's alignment
	// value is not alignment."
	nodeList = getContainedNodes(newRange, function(node) {
		return isEditable(node)
			&& isAllowedChild(node, "div")
			&& getAlignmentValue(node) != alignment;
	});

	// "While node list is not empty:"
	while (nodeList.length) {
		// "Let sublist be a list of nodes, initially empty."
		var sublist = [];

		// "Remove the first member of node list and append it to sublist."
		sublist.push(nodeList.shift());

		// "While node list is not empty, and the first member of node list is
		// the nextSibling of the last member of sublist, remove the first
		// member of node list and append it to sublist."
		while (nodeList.length
		&& nodeList[0] == sublist[sublist.length - 1].nextSibling) {
			sublist.push(nodeList.shift());
		}

		// "Wrap sublist. Sibling criteria returns true for any div that has
		// one or both of the following two attributes and no other attributes,
		// and false otherwise:"
		//
		//   * "An align attribute whose value is an ASCII case-insensitive
		//     match for alignment.
		//   * "A style attribute which sets exactly one CSS property
		//     (including unrecognized or invalid attributes), which is
		//     "text-align", which is set to alignment.
		//
		// "New parent instructions are to call createElement("div") on the
		// context object, then set its CSS property "text-align" to alignment
		// and return the result."
		wrap(sublist,
			function(node) {
				return isHtmlElement(node, "div")
					&& [].every.call(node.attributes, function(attr) {
						return (attr.name == "align" && attr.value.toLowerCase() == alignment)
							|| (attr.name == "style" && node.style.length == 1 && node.style.textAlign == alignment);
					});
			},
			function() {
				var newParent = document.createElement("div");
				newParent.setAttribute("style", "text-align: " + alignment);
				return newParent;
			}
		);
	}
}


//@}
///// Automatic linking /////
//@{
// "An autolinkable URL is a string of the following form:"
var autolinkableUrlRegexp =
	// "Either a string matching the scheme pattern from RFC 3986 section 3.1
	// followed by the literal string ://, or the literal string mailto:;
	// followed by"
	//
	// From the RFC: scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
	"([a-zA-Z][a-zA-Z0-9+.-]*://|mailto:)"
	// "Zero or more characters other than space characters; followed by"
	+ "[^ \t\n\f\r]*"
	// "A character that is not one of the ASCII characters !"'(),-.:;<>[]`{}."
	+ "[^!\"'(),\\-.:;<>[\\]`{}]";

// "A valid e-mail address is a string that matches the ABNF production 1*(
// atext / "." ) "@" ldh-str *( "." ldh-str ) where atext is defined in RFC
// 5322 section 3.2.3, and ldh-str is defined in RFC 1034 section 3.5."
//
// atext: ALPHA / DIGIT / "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" /
// "/" / "=" / "?" / "^" / "_" / "`" / "{" / "|" / "}" / "~"
//
//<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
//<let-dig-hyp> ::= <let-dig> | "-"
//<let-dig> ::= <letter> | <digit>
var validEmailRegexp =
	"[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~.]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*";

function autolink(node, endOffset) {
	// "While (node, end offset)'s previous equivalent point is not null, set
	// it to its previous equivalent point."
	while (getPreviousEquivalentPoint(node, endOffset)) {
		var prev = getPreviousEquivalentPoint(node, endOffset);
		node = prev[0];
		endOffset = prev[1];
	}

	// "If node is not a Text node, or has an a ancestor, do nothing and abort
	// these steps."
	if (node.nodeType != Node.TEXT_NODE
	|| getAncestors(node).some(function(ancestor) { return isHtmlElement(ancestor, "a") })) {
		return;
	}

	// "Let search be the largest substring of node's data whose end is end
	// offset and that contains no space characters."
	var search = /[^ \t\n\f\r]*$/.exec(node.substringData(0, endOffset))[0];

	// "If some substring of search is an autolinkable URL:"
	if (new RegExp(autolinkableUrlRegexp).test(search)) {
		// "While there is no substring of node's data ending at end offset
		// that is an autolinkable URL, decrement end offset."
		while (!(new RegExp(autolinkableUrlRegexp + "$").test(node.substringData(0, endOffset)))) {
			endOffset--;
		}

		// "Let start offset be the start index of the longest substring of
		// node's data that is an autolinkable URL ending at end offset."
		var startOffset = new RegExp(autolinkableUrlRegexp + "$").exec(node.substringData(0, endOffset)).index;

		// "Let href be the substring of node's data starting at start offset
		// and ending at end offset."
		var href = node.substringData(startOffset, endOffset - startOffset);

	// "Otherwise, if some substring of search is a valid e-mail address:"
	} else if (new RegExp(validEmailRegexp).test(search)) {
		// "While there is no substring of node's data ending at end offset
		// that is a valid e-mail address, decrement end offset."
		while (!(new RegExp(validEmailRegexp + "$").test(node.substringData(0, endOffset)))) {
			endOffset--;
		}

		// "Let start offset be the start index of the longest substring of
		// node's data that is a valid e-mail address ending at end offset."
		var startOffset = new RegExp(validEmailRegexp + "$").exec(node.substringData(0, endOffset)).index;

		// "Let href be "mailto:" concatenated with the substring of node's
		// data starting at start offset and ending at end offset."
		var href = "mailto:" + node.substringData(startOffset, endOffset - startOffset);

	// "Otherwise, do nothing and abort these steps."
	} else {
		return;
	}

	// "Let original range be the active range."
	var originalRange = getActiveRange();

	// "Create a new range with start (node, start offset) and end (node, end
	// offset), and set the context object's selection's range to it."
	var newRange = document.createRange();
	newRange.setStart(node, startOffset);
	newRange.setEnd(node, endOffset);
	getSelection().removeAllRanges();
	getSelection().addRange(newRange);
	globalRange = newRange;

	// "Take the action for "createLink", with value equal to href."
	commands.createlink.action(href);

	// "Set the context object's selection's range to original range."
	getSelection().removeAllRanges();
	getSelection().addRange(originalRange);
	globalRange = originalRange;
}
//@}
///// The delete command /////
//@{
commands["delete"] = {
	preservesOverrides: true,
	action: function() {
		// "If the active range is not collapsed, delete the selection and
		// return true."
		if (!getActiveRange().collapsed) {
			deleteSelection();
			return true;
		}

		// "Canonicalize whitespace at the active range's start."
		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);

		// "Let node and offset be the active range's start node and offset."
		var node = getActiveRange().startContainer;
		var offset = getActiveRange().startOffset;

		// "Repeat the following steps:"
		while (true) {
			// "If offset is zero and node's previousSibling is an editable
			// invisible node, remove node's previousSibling from its parent."
			if (offset == 0
			&& isEditable(node.previousSibling)
			&& isInvisible(node.previousSibling)) {
				node.parentNode.removeChild(node.previousSibling);

			// "Otherwise, if node has a child with index offset − 1 and that
			// child is an editable invisible node, remove that child from
			// node, then subtract one from offset."
			} else if (0 <= offset - 1
			&& offset - 1 < node.childNodes.length
			&& isEditable(node.childNodes[offset - 1])
			&& isInvisible(node.childNodes[offset - 1])) {
				node.removeChild(node.childNodes[offset - 1]);
				offset--;

			// "Otherwise, if offset is zero and node is an inline node, or if
			// node is an invisible node, set offset to the index of node, then
			// set node to its parent."
			} else if ((offset == 0
			&& isInlineNode(node))
			|| isInvisible(node)) {
				offset = getNodeIndex(node);
				node = node.parentNode;

			// "Otherwise, if node has a child with index offset − 1 and that
			// child is an editable a, remove that child from node, preserving
			// its descendants. Then return true."
			} else if (0 <= offset - 1
			&& offset - 1 < node.childNodes.length
			&& isEditable(node.childNodes[offset - 1])
			&& isHtmlElement(node.childNodes[offset - 1], "a")) {
				removePreservingDescendants(node.childNodes[offset - 1]);
				return true;

			// "Otherwise, if node has a child with index offset − 1 and that
			// child is not a block node or a br or an img, set node to that
			// child, then set offset to the length of node."
			} else if (0 <= offset - 1
			&& offset - 1 < node.childNodes.length
			&& !isBlockNode(node.childNodes[offset - 1])
			&& !isHtmlElement(node.childNodes[offset - 1], ["br", "img"])) {
				node = node.childNodes[offset - 1];
				offset = getNodeLength(node);

			// "Otherwise, break from this loop."
			} else {
				break;
			}
		}

		// "If node is a Text node and offset is not zero, or if node is a
		// block node that has a child with index offset − 1 and that child is
		// a br or hr or img:"
		if ((node.nodeType == Node.TEXT_NODE
		&& offset != 0)
		|| (isBlockNode(node)
		&& 0 <= offset - 1
		&& offset - 1 < node.childNodes.length
		&& isHtmlElement(node.childNodes[offset - 1], ["br", "hr", "img"]))) {
			// "Call collapse(node, offset) on the context object's Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setEnd(node, offset);

			// "Call extend(node, offset − 1) on the context object's
			// Selection."
			getSelection().extend(node, offset - 1);
			getActiveRange().setStart(node, offset - 1);

			// "Delete the selection."
			deleteSelection();

			// "Return true."
			return true;
		}

		// "If node is an inline node, return true."
		if (isInlineNode(node)) {
			return true;
		}

		// "If node is an li or dt or dd and is the first child of its parent,
		// and offset is zero:"
		if (isHtmlElement(node, ["li", "dt", "dd"])
		&& node == node.parentNode.firstChild
		&& offset == 0) {
			// "Let items be a list of all lis that are ancestors of node."
			//
			// Remember, must be in tree order.
			var items = [];
			for (var ancestor = node.parentNode; ancestor; ancestor = ancestor.parentNode) {
				if (isHtmlElement(ancestor, "li")) {
					items.unshift(ancestor);
				}
			}

			// "Normalize sublists of each item in items."
			for (var i = 0; i < items.length; i++) {
				normalizeSublists(items[i]);
			}

			// "Record the values of the one-node list consisting of node, and
			// let values be the result."
			var values = recordValues([node]);

			// "Split the parent of the one-node list consisting of node."
			splitParent([node]);

			// "Restore the values from values."
			restoreValues(values);

			// "If node is a dd or dt, and it is not an allowed child of any of
			// its ancestors in the same editing host, set the tag name of node
			// to the default single-line container name and let node be the
			// result."
			if (isHtmlElement(node, ["dd", "dt"])
			&& getAncestors(node).every(function(ancestor) {
				return !inSameEditingHost(node, ancestor)
					|| !isAllowedChild(node, ancestor)
			})) {
				node = setTagName(node, defaultSingleLineContainerName);
			}

			// "Fix disallowed ancestors of node."
			fixDisallowedAncestors(node);

			// "Return true."
			return true;
		}

		// "Let start node equal node and let start offset equal offset."
		var startNode = node;
		var startOffset = offset;

		// "Repeat the following steps:"
		while (true) {
			// "If start offset is zero, set start offset to the index of start
			// node and then set start node to its parent."
			if (startOffset == 0) {
				startOffset = getNodeIndex(startNode);
				startNode = startNode.parentNode;

			// "Otherwise, if start node has an editable invisible child with
			// index start offset minus one, remove it from start node and
			// subtract one from start offset."
			} else if (0 <= startOffset - 1
			&& startOffset - 1 < startNode.childNodes.length
			&& isEditable(startNode.childNodes[startOffset - 1])
			&& isInvisible(startNode.childNodes[startOffset - 1])) {
				startNode.removeChild(startNode.childNodes[startOffset - 1]);
				startOffset--;

			// "Otherwise, break from this loop."
			} else {
				break;
			}
		}

		// "If offset is zero, and node has an editable ancestor container in
		// the same editing host that's an indentation element:"
		if (offset == 0
		&& getAncestors(node).concat(node).filter(function(ancestor) {
			return isEditable(ancestor)
				&& inSameEditingHost(ancestor, node)
				&& isIndentationElement(ancestor);
		}).length) {
			// "Block-extend the range whose start and end are both (node, 0),
			// and let new range be the result."
			var newRange = document.createRange();
			newRange.setStart(node, 0);
			newRange = blockExtend(newRange);

			// "Let node list be a list of nodes, initially empty."
			//
			// "For each node current node contained in new range, append
			// current node to node list if the last member of node list (if
			// any) is not an ancestor of current node, and current node is
			// editable but has no editable descendants."
			var nodeList = getContainedNodes(newRange, function(currentNode) {
				return isEditable(currentNode)
					&& !hasEditableDescendants(currentNode);
			});

			// "Outdent each node in node list."
			for (var i = 0; i < nodeList.length; i++) {
				outdentNode(nodeList[i]);
			}

			// "Return true."
			return true;
		}

		// "If the child of start node with index start offset is a table,
		// return true."
		if (isHtmlElement(startNode.childNodes[startOffset], "table")) {
			return true;
		}

		// "If start node has a child with index start offset − 1, and that
		// child is a table:"
		if (0 <= startOffset - 1
		&& startOffset - 1 < startNode.childNodes.length
		&& isHtmlElement(startNode.childNodes[startOffset - 1], "table")) {
			// "Call collapse(start node, start offset − 1) on the context
			// object's Selection."
			getSelection().collapse(startNode, startOffset - 1);
			getActiveRange().setStart(startNode, startOffset - 1);

			// "Call extend(start node, start offset) on the context object's
			// Selection."
			getSelection().extend(startNode, startOffset);
			getActiveRange().setEnd(startNode, startOffset);

			// "Return true."
			return true;
		}

		// "If offset is zero; and either the child of start node with index
		// start offset minus one is an hr, or the child is a br whose
		// previousSibling is either a br or not an inline node:"
		if (offset == 0
		&& (isHtmlElement(startNode.childNodes[startOffset - 1], "hr")
			|| (
				isHtmlElement(startNode.childNodes[startOffset - 1], "br")
				&& (
					isHtmlElement(startNode.childNodes[startOffset - 1].previousSibling, "br")
					|| !isInlineNode(startNode.childNodes[startOffset - 1].previousSibling)
				)
			)
		)) {
			// "Call collapse(start node, start offset − 1) on the context
			// object's Selection."
			getSelection().collapse(startNode, startOffset - 1);
			getActiveRange().setStart(startNode, startOffset - 1);

			// "Call extend(start node, start offset) on the context object's
			// Selection."
			getSelection().extend(startNode, startOffset);
			getActiveRange().setEnd(startNode, startOffset);

			// "Delete the selection."
			deleteSelection();

			// "Call collapse(node, offset) on the Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setStart(node, offset);
			getActiveRange().collapse(true);

			// "Return true."
			return true;
		}

		// "If the child of start node with index start offset is an li or dt
		// or dd, and that child's firstChild is an inline node, and start
		// offset is not zero:"
		if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
		&& isInlineNode(startNode.childNodes[startOffset].firstChild)
		&& startOffset != 0) {
			// "Let previous item be the child of start node with index start
			// offset minus one."
			var previousItem = startNode.childNodes[startOffset - 1];

			// "If previous item's lastChild is an inline node other than a br,
			// call createElement("br") on the context object and append the
			// result as the last child of previous item."
			if (isInlineNode(previousItem.lastChild)
			&& !isHtmlElement(previousItem.lastChild, "br")) {
				previousItem.appendChild(document.createElement("br"));
			}

			// "If previous item's lastChild is an inline node, call
			// createElement("br") on the context object and append the result
			// as the last child of previous item."
			if (isInlineNode(previousItem.lastChild)) {
				previousItem.appendChild(document.createElement("br"));
			}
		}

		// "If start node's child with index start offset is an li or dt or dd,
		// and that child's previousSibling is also an li or dt or dd:"
		if (isHtmlElement(startNode.childNodes[startOffset], ["li", "dt", "dd"])
		&& isHtmlElement(startNode.childNodes[startOffset].previousSibling, ["li", "dt", "dd"])) {
			// "Call cloneRange() on the active range, and let original range
			// be the result."
			//
			// We need to add it to extraRanges so it will actually get updated
			// when moving preserving ranges.
			var originalRange = getActiveRange().cloneRange();
			extraRanges.push(originalRange);

			// "Set start node to its child with index start offset − 1."
			startNode = startNode.childNodes[startOffset - 1];

			// "Set start offset to start node's length."
			startOffset = getNodeLength(startNode);

			// "Set node to start node's nextSibling."
			node = startNode.nextSibling;

			// "Call collapse(start node, start offset) on the context object's
			// Selection."
			getSelection().collapse(startNode, startOffset);
			getActiveRange().setStart(startNode, startOffset);

			// "Call extend(node, 0) on the context object's Selection."
			getSelection().extend(node, 0);
			getActiveRange().setEnd(node, 0);

			// "Delete the selection."
			deleteSelection();

			// "Call removeAllRanges() on the context object's Selection."
			getSelection().removeAllRanges();

			// "Call addRange(original range) on the context object's
			// Selection."
			getSelection().addRange(originalRange);
			getActiveRange().setStart(originalRange.startContainer, originalRange.startOffset);
			getActiveRange().setEnd(originalRange.endContainer, originalRange.endOffset);

			// "Return true."
			extraRanges.pop();
			return true;
		}

		// "While start node has a child with index start offset minus one:"
		while (0 <= startOffset - 1
		&& startOffset - 1 < startNode.childNodes.length) {
			// "If start node's child with index start offset minus one is
			// editable and invisible, remove it from start node, then subtract
			// one from start offset."
			if (isEditable(startNode.childNodes[startOffset - 1])
			&& isInvisible(startNode.childNodes[startOffset - 1])) {
				startNode.removeChild(startNode.childNodes[startOffset - 1]);
				startOffset--;

			// "Otherwise, set start node to its child with index start offset
			// minus one, then set start offset to the length of start node."
			} else {
				startNode = startNode.childNodes[startOffset - 1];
				startOffset = getNodeLength(startNode);
			}
		}

		// "Call collapse(start node, start offset) on the context object's
		// Selection."
		getSelection().collapse(startNode, startOffset);
		getActiveRange().setStart(startNode, startOffset);

		// "Call extend(node, offset) on the context object's Selection."
		getSelection().extend(node, offset);
		getActiveRange().setEnd(node, offset);

		// "Delete the selection, with direction "backward"."
		deleteSelection({direction: "backward"});

		// "Return true."
		return true;
	}
};

//@}
///// The formatBlock command /////
//@{
// "A formattable block name is "address", "dd", "div", "dt", "h1", "h2", "h3",
// "h4", "h5", "h6", "p", or "pre"."
var formattableBlockNames = ["address", "dd", "div", "dt", "h1", "h2", "h3",
	"h4", "h5", "h6", "p", "pre"];

commands.formatblock = {
	preservesOverrides: true,
	action: function(value) {
		// "If value begins with a "<" character and ends with a ">" character,
		// remove the first and last characters from it."
		if (/^<.*>$/.test(value)) {
			value = value.slice(1, -1);
		}

		// "Let value be converted to ASCII lowercase."
		value = value.toLowerCase();

		// "If value is not a formattable block name, return false."
		if (formattableBlockNames.indexOf(value) == -1) {
			return false;
		}

		// "Block-extend the active range, and let new range be the result."
		var newRange = blockExtend(getActiveRange());

		// "Let node list be an empty list of nodes."
		//
		// "For each node node contained in new range, append node to node list
		// if it is editable, the last member of original node list (if any) is
		// not an ancestor of node, node is either a non-list single-line
		// container or an allowed child of "p" or a dd or dt, and node is not
		// the ancestor of a prohibited paragraph child."
		var nodeList = getContainedNodes(newRange, function(node) {
			return isEditable(node)
				&& (isNonListSingleLineContainer(node)
				|| isAllowedChild(node, "p")
				|| isHtmlElement(node, ["dd", "dt"]))
				&& !getDescendants(node).some(isProhibitedParagraphChild);
		});

		// "Record the values of node list, and let values be the result."
		var values = recordValues(nodeList);

		// "For each node in node list, while node is the descendant of an
		// editable HTML element in the same editing host, whose local name is
		// a formattable block name, and which is not the ancestor of a
		// prohibited paragraph child, split the parent of the one-node list
		// consisting of node."
		for (var i = 0; i < nodeList.length; i++) {
			var node = nodeList[i];
			while (getAncestors(node).some(function(ancestor) {
				return isEditable(ancestor)
					&& inSameEditingHost(ancestor, node)
					&& isHtmlElement(ancestor, formattableBlockNames)
					&& !getDescendants(ancestor).some(isProhibitedParagraphChild);
			})) {
				splitParent([node]);
			}
		}

		// "Restore the values from values."
		restoreValues(values);

		// "While node list is not empty:"
		while (nodeList.length) {
			var sublist;

			// "If the first member of node list is a single-line
			// container:"
			if (isSingleLineContainer(nodeList[0])) {
				// "Let sublist be the children of the first member of node
				// list."
				sublist = [].slice.call(nodeList[0].childNodes);

				// "Record the values of sublist, and let values be the
				// result."
				var values = recordValues(sublist);

				// "Remove the first member of node list from its parent,
				// preserving its descendants."
				removePreservingDescendants(nodeList[0]);

				// "Restore the values from values."
				restoreValues(values);

				// "Remove the first member from node list."
				nodeList.shift();

			// "Otherwise:"
			} else {
				// "Let sublist be an empty list of nodes."
				sublist = [];

				// "Remove the first member of node list and append it to
				// sublist."
				sublist.push(nodeList.shift());

				// "While node list is not empty, and the first member of
				// node list is the nextSibling of the last member of
				// sublist, and the first member of node list is not a
				// single-line container, and the last member of sublist is
				// not a br, remove the first member of node list and
				// append it to sublist."
				while (nodeList.length
				&& nodeList[0] == sublist[sublist.length - 1].nextSibling
				&& !isSingleLineContainer(nodeList[0])
				&& !isHtmlElement(sublist[sublist.length - 1], "BR")) {
					sublist.push(nodeList.shift());
				}
			}

			// "Wrap sublist. If value is "div" or "p", sibling criteria
			// returns false; otherwise it returns true for an HTML element
			// with local name value and no attributes, and false otherwise.
			// New parent instructions return the result of running
			// createElement(value) on the context object. Then fix disallowed
			// ancestors of the result."
			fixDisallowedAncestors(wrap(sublist,
				["div", "p"].indexOf(value) == - 1
					? function(node) { return isHtmlElement(node, value) && !node.attributes.length }
					: function() { return false },
				function() { return document.createElement(value) }));
		}

		// "Return true."
		return true;
	}, indeterm: function() {
		// "If the active range is null, return false."
		if (!getActiveRange()) {
			return false;
		}

		// "Block-extend the active range, and let new range be the result."
		var newRange = blockExtend(getActiveRange());

		// "Let node list be all visible editable nodes that are contained in
		// new range and have no children."
		var nodeList = getAllContainedNodes(newRange, function(node) {
			return isVisible(node)
				&& isEditable(node)
				&& !node.hasChildNodes();
		});

		// "If node list is empty, return false."
		if (!nodeList.length) {
			return false;
		}

		// "Let type be null."
		var type = null;

		// "For each node in node list:"
		for (var i = 0; i < nodeList.length; i++) {
			var node = nodeList[i];

			// "While node's parent is editable and in the same editing host as
			// node, and node is not an HTML element whose local name is a
			// formattable block name, set node to its parent."
			while (isEditable(node.parentNode)
			&& inSameEditingHost(node, node.parentNode)
			&& !isHtmlElement(node, formattableBlockNames)) {
				node = node.parentNode;
			}

			// "Let current type be the empty string."
			var currentType = "";

			// "If node is an editable HTML element whose local name is a
			// formattable block name, and node is not the ancestor of a
			// prohibited paragraph child, set current type to node's local
			// name."
			if (isEditable(node)
			&& isHtmlElement(node, formattableBlockNames)
			&& !getDescendants(node).some(isProhibitedParagraphChild)) {
				currentType = node.tagName;
			}

			// "If type is null, set type to current type."
			if (type === null) {
				type = currentType;

			// "Otherwise, if type does not equal current type, return true."
			} else if (type != currentType) {
				return true;
			}
		}

		// "Return false."
		return false;
	}, value: function() {
		// "If the active range is null, return the empty string."
		if (!getActiveRange()) {
			return "";
		}

		// "Block-extend the active range, and let new range be the result."
		var newRange = blockExtend(getActiveRange());

		// "Let node be the first visible editable node that is contained in
		// new range and has no children. If there is no such node, return the
		// empty string."
		var nodes = getAllContainedNodes(newRange, function(node) {
			return isVisible(node)
				&& isEditable(node)
				&& !node.hasChildNodes();
		});
		if (!nodes.length) {
			return "";
		}
		var node = nodes[0];

		// "While node's parent is editable and in the same editing host as
		// node, and node is not an HTML element whose local name is a
		// formattable block name, set node to its parent."
		while (isEditable(node.parentNode)
		&& inSameEditingHost(node, node.parentNode)
		&& !isHtmlElement(node, formattableBlockNames)) {
			node = node.parentNode;
		}

		// "If node is an editable HTML element whose local name is a
		// formattable block name, and node is not the ancestor of a prohibited
		// paragraph child, return node's local name, converted to ASCII
		// lowercase."
		if (isEditable(node)
		&& isHtmlElement(node, formattableBlockNames)
		&& !getDescendants(node).some(isProhibitedParagraphChild)) {
			return node.tagName.toLowerCase();
		}

		// "Return the empty string."
		return "";
	}
};

//@}
///// The forwardDelete command /////
//@{
commands.forwarddelete = {
	preservesOverrides: true,
	action: function() {
		// "If the active range is not collapsed, delete the selection and
		// return true."
		if (!getActiveRange().collapsed) {
			deleteSelection();
			return true;
		}

		// "Canonicalize whitespace at the active range's start."
		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset);

		// "Let node and offset be the active range's start node and offset."
		var node = getActiveRange().startContainer;
		var offset = getActiveRange().startOffset;

		// "Repeat the following steps:"
		while (true) {
			// "If offset is the length of node and node's nextSibling is an
			// editable invisible node, remove node's nextSibling from its
			// parent."
			if (offset == getNodeLength(node)
			&& isEditable(node.nextSibling)
			&& isInvisible(node.nextSibling)) {
				node.parentNode.removeChild(node.nextSibling);

			// "Otherwise, if node has a child with index offset and that child
			// is an editable invisible node, remove that child from node."
			} else if (offset < node.childNodes.length
			&& isEditable(node.childNodes[offset])
			&& isInvisible(node.childNodes[offset])) {
				node.removeChild(node.childNodes[offset]);

			// "Otherwise, if offset is the length of node and node is an
			// inline node, or if node is invisible, set offset to one plus the
			// index of node, then set node to its parent."
			} else if ((offset == getNodeLength(node)
			&& isInlineNode(node))
			|| isInvisible(node)) {
				offset = 1 + getNodeIndex(node);
				node = node.parentNode;

			// "Otherwise, if node has a child with index offset and that child
			// is neither a block node nor a br nor an img nor a collapsed
			// block prop, set node to that child, then set offset to zero."
			} else if (offset < node.childNodes.length
			&& !isBlockNode(node.childNodes[offset])
			&& !isHtmlElement(node.childNodes[offset], ["br", "img"])
			&& !isCollapsedBlockProp(node.childNodes[offset])) {
				node = node.childNodes[offset];
				offset = 0;

			// "Otherwise, break from this loop."
			} else {
				break;
			}
		}

		// "If node is a Text node and offset is not node's length:"
		if (node.nodeType == Node.TEXT_NODE
		&& offset != getNodeLength(node)) {
			// "Let end offset be offset plus one."
			var endOffset = offset + 1;

			// "While end offset is not node's length and the end offsetth
			// element of node's data has general category M when interpreted
			// as a Unicode code point, add one to end offset."
			//
			// TODO: Not even going to try handling anything beyond the most
			// basic combining marks, since I couldn't find a good list.  I
			// special-case a few Hebrew diacritics too to test basic coverage
			// of non-Latin stuff.
			while (endOffset != node.length
			&& /^[\u0300-\u036f\u0591-\u05bd\u05c1\u05c2]$/.test(node.data[endOffset])) {
				endOffset++;
			}

			// "Call collapse(node, offset) on the context object's Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setStart(node, offset);

			// "Call extend(node, end offset) on the context object's
			// Selection."
			getSelection().extend(node, endOffset);
			getActiveRange().setEnd(node, endOffset);

			// "Delete the selection."
			deleteSelection();

			// "Return true."
			return true;
		}

		// "If node is an inline node, return true."
		if (isInlineNode(node)) {
			return true;
		}

		// "If node has a child with index offset and that child is a br or hr
		// or img, but is not a collapsed block prop:"
		if (offset < node.childNodes.length
		&& isHtmlElement(node.childNodes[offset], ["br", "hr", "img"])
		&& !isCollapsedBlockProp(node.childNodes[offset])) {
			// "Call collapse(node, offset) on the context object's Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setStart(node, offset);

			// "Call extend(node, offset + 1) on the context object's
			// Selection."
			getSelection().extend(node, offset + 1);
			getActiveRange().setEnd(node, offset + 1);

			// "Delete the selection."
			deleteSelection();

			// "Return true."
			return true;
		}

		// "Let end node equal node and let end offset equal offset."
		var endNode = node;
		var endOffset = offset;

		// "If end node has a child with index end offset, and that child is a
		// collapsed block prop, add one to end offset."
		if (endOffset < endNode.childNodes.length
		&& isCollapsedBlockProp(endNode.childNodes[endOffset])) {
			endOffset++;
		}

		// "Repeat the following steps:"
		while (true) {
			// "If end offset is the length of end node, set end offset to one
			// plus the index of end node and then set end node to its parent."
			if (endOffset == getNodeLength(endNode)) {
				endOffset = 1 + getNodeIndex(endNode);
				endNode = endNode.parentNode;

			// "Otherwise, if end node has a an editable invisible child with
			// index end offset, remove it from end node."
			} else if (endOffset < endNode.childNodes.length
			&& isEditable(endNode.childNodes[endOffset])
			&& isInvisible(endNode.childNodes[endOffset])) {
				endNode.removeChild(endNode.childNodes[endOffset]);

			// "Otherwise, break from this loop."
			} else {
				break;
			}
		}

		// "If the child of end node with index end offset minus one is a
		// table, return true."
		if (isHtmlElement(endNode.childNodes[endOffset - 1], "table")) {
			return true;
		}

		// "If the child of end node with index end offset is a table:"
		if (isHtmlElement(endNode.childNodes[endOffset], "table")) {
			// "Call collapse(end node, end offset) on the context object's
			// Selection."
			getSelection().collapse(endNode, endOffset);
			getActiveRange().setStart(endNode, endOffset);

			// "Call extend(end node, end offset + 1) on the context object's
			// Selection."
			getSelection().extend(endNode, endOffset + 1);
			getActiveRange().setEnd(endNode, endOffset + 1);

			// "Return true."
			return true;
		}

		// "If offset is the length of node, and the child of end node with
		// index end offset is an hr or br:"
		if (offset == getNodeLength(node)
		&& isHtmlElement(endNode.childNodes[endOffset], ["br", "hr"])) {
			// "Call collapse(end node, end offset) on the context object's
			// Selection."
			getSelection().collapse(endNode, endOffset);
			getActiveRange().setStart(endNode, endOffset);

			// "Call extend(end node, end offset + 1) on the context object's
			// Selection."
			getSelection().extend(endNode, endOffset + 1);
			getActiveRange().setEnd(endNode, endOffset + 1);

			// "Delete the selection."
			deleteSelection();

			// "Call collapse(node, offset) on the Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setStart(node, offset);
			getActiveRange().collapse(true);

			// "Return true."
			return true;
		}

		// "While end node has a child with index end offset:"
		while (endOffset < endNode.childNodes.length) {
			// "If end node's child with index end offset is editable and
			// invisible, remove it from end node."
			if (isEditable(endNode.childNodes[endOffset])
			&& isInvisible(endNode.childNodes[endOffset])) {
				endNode.removeChild(endNode.childNodes[endOffset]);

			// "Otherwise, set end node to its child with index end offset and
			// set end offset to zero."
			} else {
				endNode = endNode.childNodes[endOffset];
				endOffset = 0;
			}
		}

		// "Call collapse(node, offset) on the context object's Selection."
		getSelection().collapse(node, offset);
		getActiveRange().setStart(node, offset);

		// "Call extend(end node, end offset) on the context object's
		// Selection."
		getSelection().extend(endNode, endOffset);
		getActiveRange().setEnd(endNode, endOffset);

		// "Delete the selection."
		deleteSelection();

		// "Return true."
		return true;
	}
};

//@}
///// The indent command /////
//@{
commands.indent = {
	preservesOverrides: true,
	action: function() {
		// "Let items be a list of all lis that are ancestor containers of the
		// active range's start and/or end node."
		//
		// Has to be in tree order, remember!
		var items = [];
		for (var node = getActiveRange().endContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
			if (isHtmlElement(node, "LI")) {
				items.unshift(node);
			}
		}
		for (var node = getActiveRange().startContainer; node != getActiveRange().commonAncestorContainer; node = node.parentNode) {
			if (isHtmlElement(node, "LI")) {
				items.unshift(node);
			}
		}
		for (var node = getActiveRange().commonAncestorContainer; node; node = node.parentNode) {
			if (isHtmlElement(node, "LI")) {
				items.unshift(node);
			}
		}

		// "For each item in items, normalize sublists of item."
		for (var i = 0; i < items.length; i++) {
			normalizeSublists(items[i]);
		}

		// "Block-extend the active range, and let new range be the result."
		var newRange = blockExtend(getActiveRange());

		// "Let node list be a list of nodes, initially empty."
		var nodeList = [];

		// "For each node node contained in new range, if node is editable and
		// is an allowed child of "div" or "ol" and if the last member of node
		// list (if any) is not an ancestor of node, append node to node list."
		nodeList = getContainedNodes(newRange, function(node) {
			return isEditable(node)
				&& (isAllowedChild(node, "div")
				|| isAllowedChild(node, "ol"));
		});

		// "If the first visible member of node list is an li whose parent is
		// an ol or ul:"
		if (isHtmlElement(nodeList.filter(isVisible)[0], "li")
		&& isHtmlElement(nodeList.filter(isVisible)[0].parentNode, ["ol", "ul"])) {
			// "Let sibling be node list's first visible member's
			// previousSibling."
			var sibling = nodeList.filter(isVisible)[0].previousSibling;

			// "While sibling is invisible, set sibling to its
			// previousSibling."
			while (isInvisible(sibling)) {
				sibling = sibling.previousSibling;
			}

			// "If sibling is an li, normalize sublists of sibling."
			if (isHtmlElement(sibling, "li")) {
				normalizeSublists(sibling);
			}
		}

		// "While node list is not empty:"
		while (nodeList.length) {
			// "Let sublist be a list of nodes, initially empty."
			var sublist = [];

			// "Remove the first member of node list and append it to sublist."
			sublist.push(nodeList.shift());

			// "While the first member of node list is the nextSibling of the
			// last member of sublist, remove the first member of node list and
			// append it to sublist."
			while (nodeList.length
			&& nodeList[0] == sublist[sublist.length - 1].nextSibling) {
				sublist.push(nodeList.shift());
			}

			// "Indent sublist."
			indentNodes(sublist);
		}

		// "Return true."
		return true;
	}
};

//@}
///// The insertHorizontalRule command /////
//@{
commands.inserthorizontalrule = {
	preservesOverrides: true,
	action: function() {
		// "Let start node, start offset, end node, and end offset be the
		// active range's start and end nodes and offsets."
		var startNode = getActiveRange().startContainer;
		var startOffset = getActiveRange().startOffset;
		var endNode = getActiveRange().endContainer;
		var endOffset = getActiveRange().endOffset;

		// "While start offset is 0 and start node's parent is not null, set
		// start offset to start node's index, then set start node to its
		// parent."
		while (startOffset == 0
		&& startNode.parentNode) {
			startOffset = getNodeIndex(startNode);
			startNode = startNode.parentNode;
		}

		// "While end offset is end node's length, and end node's parent is not
		// null, set end offset to one plus end node's index, then set end node
		// to its parent."
		while (endOffset == getNodeLength(endNode)
		&& endNode.parentNode) {
			endOffset = 1 + getNodeIndex(endNode);
			endNode = endNode.parentNode;
		}

		// "Call collapse(start node, start offset) on the context object's
		// Selection."
		getSelection().collapse(startNode, startOffset);
		getActiveRange().setStart(startNode, startOffset);

		// "Call extend(end node, end offset) on the context object's
		// Selection."
		getSelection().extend(endNode, endOffset);
		getActiveRange().setEnd(endNode, endOffset);

		// "Delete the selection, with block merging false."
		deleteSelection({blockMerging: false});

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "If the active range's start node is a Text node and its start
		// offset is zero, call collapse() on the context object's Selection,
		// with first argument the active range's start node's parent and
		// second argument the active range's start node's index."
		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().startOffset == 0) {
			var newNode = getActiveRange().startContainer.parentNode;
			var newOffset = getNodeIndex(getActiveRange().startContainer);
			getSelection().collapse(newNode, newOffset);
			getActiveRange().setStart(newNode, newOffset);
			getActiveRange().collapse(true);
		}

		// "If the active range's start node is a Text node and its start
		// offset is the length of its start node, call collapse() on the
		// context object's Selection, with first argument the active range's
		// start node's parent, and the second argument one plus the active
		// range's start node's index."
		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
			var newNode = getActiveRange().startContainer.parentNode;
			var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
			getSelection().collapse(newNode, newOffset);
			getActiveRange().setStart(newNode, newOffset);
			getActiveRange().collapse(true);
		}

		// "Let hr be the result of calling createElement("hr") on the
		// context object."
		var hr = document.createElement("hr");

		// "Run insertNode(hr) on the active range."
		getActiveRange().insertNode(hr);

		// "Fix disallowed ancestors of hr."
		fixDisallowedAncestors(hr);

		// "Run collapse() on the context object's Selection, with first
		// argument hr's parent and the second argument equal to one plus hr's
		// index."
		getSelection().collapse(hr.parentNode, 1 + getNodeIndex(hr));
		getActiveRange().setStart(hr.parentNode, 1 + getNodeIndex(hr));
		getActiveRange().collapse(true);

		// "Return true."
		return true;
	}
};

//@}
///// The insertHTML command /////
//@{
commands.inserthtml = {
	preservesOverrides: true,
	action: function(value) {
		// "Delete the selection."
		deleteSelection();

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "Let frag be the result of calling createContextualFragment(value)
		// on the active range."
		var frag = getActiveRange().createContextualFragment(value);

		// "Let last child be the lastChild of frag."
		var lastChild = frag.lastChild;

		// "If last child is null, return true."
		if (!lastChild) {
			return true;
		}

		// "Let descendants be all descendants of frag."
		var descendants = getDescendants(frag);

		// "If the active range's start node is a block node:"
		if (isBlockNode(getActiveRange().startContainer)) {
			// "Let collapsed block props be all editable collapsed block prop
			// children of the active range's start node that have index
			// greater than or equal to the active range's start offset."
			//
			// "For each node in collapsed block props, remove node from its
			// parent."
			[].filter.call(getActiveRange().startContainer.childNodes, function(node) {
				return isEditable(node)
					&& isCollapsedBlockProp(node)
					&& getNodeIndex(node) >= getActiveRange().startOffset;
			}).forEach(function(node) {
				node.parentNode.removeChild(node);
			});
		}

		// "Call insertNode(frag) on the active range."
		getActiveRange().insertNode(frag);

		// "If the active range's start node is a block node with no visible
		// children, call createElement("br") on the context object and append
		// the result as the last child of the active range's start node."
		if (isBlockNode(getActiveRange().startContainer)
		&& ![].some.call(getActiveRange().startContainer.childNodes, isVisible)) {
			getActiveRange().startContainer.appendChild(document.createElement("br"));
		}

		// "Call collapse() on the context object's Selection, with last
		// child's parent as the first argument and one plus its index as the
		// second."
		getActiveRange().setStart(lastChild.parentNode, 1 + getNodeIndex(lastChild));
		getActiveRange().setEnd(lastChild.parentNode, 1 + getNodeIndex(lastChild));

		// "Fix disallowed ancestors of each member of descendants."
		for (var i = 0; i < descendants.length; i++) {
			fixDisallowedAncestors(descendants[i]);
		}

		// "Return true."
		return true;
	}
};

//@}
///// The insertImage command /////
//@{
commands.insertimage = {
	preservesOverrides: true,
	action: function(value) {
		// "If value is the empty string, return false."
		if (value === "") {
			return false;
		}

		// "Delete the selection, with strip wrappers false."
		deleteSelection({stripWrappers: false});

		// "Let range be the active range."
		var range = getActiveRange();

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "If range's start node is a block node whose sole child is a br, and
		// its start offset is 0, remove its start node's child from it."
		if (isBlockNode(range.startContainer)
		&& range.startContainer.childNodes.length == 1
		&& isHtmlElement(range.startContainer.firstChild, "br")
		&& range.startOffset == 0) {
			range.startContainer.removeChild(range.startContainer.firstChild);
		}

		// "Let img be the result of calling createElement("img") on the
		// context object."
		var img = document.createElement("img");

		// "Run setAttribute("src", value) on img."
		img.setAttribute("src", value);

		// "Run insertNode(img) on the range."
		range.insertNode(img);

		// "Run collapse() on the Selection, with first argument equal to the
		// parent of img and the second argument equal to one plus the index of
		// img."
		//
		// Not everyone actually supports collapse(), so we do it manually
		// instead.  Also, we need to modify the actual range we're given as
		// well, for the sake of autoimplementation.html's range-filling-in.
		range.setStart(img.parentNode, 1 + getNodeIndex(img));
		range.setEnd(img.parentNode, 1 + getNodeIndex(img));
		getSelection().removeAllRanges();
		getSelection().addRange(range);

		// IE adds width and height attributes for some reason, so remove those
		// to actually do what the spec says.
		img.removeAttribute("width");
		img.removeAttribute("height");

		// "Return true."
		return true;
	}
};

//@}
///// The insertLineBreak command /////
//@{
commands.insertlinebreak = {
	preservesOverrides: true,
	action: function(value) {
		// "Delete the selection, with strip wrappers false."
		deleteSelection({stripWrappers: false});

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "If the active range's start node is an Element, and "br" is not an
		// allowed child of it, return true."
		if (getActiveRange().startContainer.nodeType == Node.ELEMENT_NODE
		&& !isAllowedChild("br", getActiveRange().startContainer)) {
			return true;
		}

		// "If the active range's start node is not an Element, and "br" is not
		// an allowed child of the active range's start node's parent, return
		// true."
		if (getActiveRange().startContainer.nodeType != Node.ELEMENT_NODE
		&& !isAllowedChild("br", getActiveRange().startContainer.parentNode)) {
			return true;
		}

		// "If the active range's start node is a Text node and its start
		// offset is zero, call collapse() on the context object's Selection,
		// with first argument equal to the active range's start node's parent
		// and second argument equal to the active range's start node's index."
		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().startOffset == 0) {
			var newNode = getActiveRange().startContainer.parentNode;
			var newOffset = getNodeIndex(getActiveRange().startContainer);
			getSelection().collapse(newNode, newOffset);
			getActiveRange().setStart(newNode, newOffset);
			getActiveRange().setEnd(newNode, newOffset);
		}

		// "If the active range's start node is a Text node and its start
		// offset is the length of its start node, call collapse() on the
		// context object's Selection, with first argument equal to the active
		// range's start node's parent and second argument equal to one plus
		// the active range's start node's index."
		if (getActiveRange().startContainer.nodeType == Node.TEXT_NODE
		&& getActiveRange().startOffset == getNodeLength(getActiveRange().startContainer)) {
			var newNode = getActiveRange().startContainer.parentNode;
			var newOffset = 1 + getNodeIndex(getActiveRange().startContainer);
			getSelection().collapse(newNode, newOffset);
			getActiveRange().setStart(newNode, newOffset);
			getActiveRange().setEnd(newNode, newOffset);
		}

		// "Let br be the result of calling createElement("br") on the context
		// object."
		var br = document.createElement("br");

		// "Call insertNode(br) on the active range."
		getActiveRange().insertNode(br);

		// "Call collapse() on the context object's Selection, with br's parent
		// as the first argument and one plus br's index as the second
		// argument."
		getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
		getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
		getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));

		// "If br is a collapsed line break, call createElement("br") on the
		// context object and let extra br be the result, then call
		// insertNode(extra br) on the active range."
		if (isCollapsedLineBreak(br)) {
			getActiveRange().insertNode(document.createElement("br"));

			// Compensate for nonstandard implementations of insertNode
			getSelection().collapse(br.parentNode, 1 + getNodeIndex(br));
			getActiveRange().setStart(br.parentNode, 1 + getNodeIndex(br));
			getActiveRange().setEnd(br.parentNode, 1 + getNodeIndex(br));
		}

		// "Return true."
		return true;
	}
};

//@}
///// The insertOrderedList command /////
//@{
commands.insertorderedlist = {
	preservesOverrides: true,
	// "Toggle lists with tag name "ol", then return true."
	action: function() { toggleLists("ol"); return true },
	// "True if the selection's list state is "mixed" or "mixed ol", false
	// otherwise."
	indeterm: function() { return /^mixed( ol)?$/.test(getSelectionListState()) },
	// "True if the selection's list state is "ol", false otherwise."
	state: function() { return getSelectionListState() == "ol" },
};

//@}
///// The insertParagraph command /////
//@{
commands.insertparagraph = {
	preservesOverrides: true,
	action: function() {
		// "Delete the selection."
		deleteSelection();

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "Let node and offset be the active range's start node and offset."
		var node = getActiveRange().startContainer;
		var offset = getActiveRange().startOffset;

		// "If node is a Text node, and offset is neither 0 nor the length of
		// node, call splitText(offset) on node."
		if (node.nodeType == Node.TEXT_NODE
		&& offset != 0
		&& offset != getNodeLength(node)) {
			node.splitText(offset);
		}

		// "If node is a Text node and offset is its length, set offset to one
		// plus the index of node, then set node to its parent."
		if (node.nodeType == Node.TEXT_NODE
		&& offset == getNodeLength(node)) {
			offset = 1 + getNodeIndex(node);
			node = node.parentNode;
		}

		// "If node is a Text or Comment node, set offset to the index of node,
		// then set node to its parent."
		if (node.nodeType == Node.TEXT_NODE
		|| node.nodeType == Node.COMMENT_NODE) {
			offset = getNodeIndex(node);
			node = node.parentNode;
		}

		// "Call collapse(node, offset) on the context object's Selection."
		getSelection().collapse(node, offset);
		getActiveRange().setStart(node, offset);
		getActiveRange().setEnd(node, offset);

		// "Let container equal node."
		var container = node;

		// "While container is not a single-line container, and container's
		// parent is editable and in the same editing host as node, set
		// container to its parent."
		while (!isSingleLineContainer(container)
		&& isEditable(container.parentNode)
		&& inSameEditingHost(node, container.parentNode)) {
			container = container.parentNode;
		}

		// "If container is an editable single-line container in the same
		// editing host as node, and its local name is "p" or "div":"
		if (isEditable(container)
		&& isSingleLineContainer(container)
		&& inSameEditingHost(node, container.parentNode)
		&& (container.tagName == "P" || container.tagName == "DIV")) {
			// "Let outer container equal container."
			var outerContainer = container;

			// "While outer container is not a dd or dt or li, and outer
			// container's parent is editable, set outer container to its
			// parent."
			while (!isHtmlElement(outerContainer, ["dd", "dt", "li"])
			&& isEditable(outerContainer.parentNode)) {
				outerContainer = outerContainer.parentNode;
			}

			// "If outer container is a dd or dt or li, set container to outer
			// container."
			if (isHtmlElement(outerContainer, ["dd", "dt", "li"])) {
				container = outerContainer;
			}
		}

		// "If container is not editable or not in the same editing host as
		// node or is not a single-line container:"
		if (!isEditable(container)
		|| !inSameEditingHost(container, node)
		|| !isSingleLineContainer(container)) {
			// "Let tag be the default single-line container name."
			var tag = defaultSingleLineContainerName;

			// "Block-extend the active range, and let new range be the
			// result."
			var newRange = blockExtend(getActiveRange());

			// "Let node list be a list of nodes, initially empty."
			//
			// "Append to node list the first node in tree order that is
			// contained in new range and is an allowed child of "p", if any."
			var nodeList = getContainedNodes(newRange, function(node) { return isAllowedChild(node, "p") })
				.slice(0, 1);

			// "If node list is empty:"
			if (!nodeList.length) {
				// "If tag is not an allowed child of the active range's start
				// node, return true."
				if (!isAllowedChild(tag, getActiveRange().startContainer)) {
					return true;
				}

				// "Set container to the result of calling createElement(tag)
				// on the context object."
				container = document.createElement(tag);

				// "Call insertNode(container) on the active range."
				getActiveRange().insertNode(container);

				// "Call createElement("br") on the context object, and append
				// the result as the last child of container."
				container.appendChild(document.createElement("br"));

				// "Call collapse(container, 0) on the context object's
				// Selection."
				getSelection().collapse(container, 0);
				getActiveRange().setStart(container, 0);
				getActiveRange().setEnd(container, 0);

				// "Return true."
				return true;
			}

			// "While the nextSibling of the last member of node list is not
			// null and is an allowed child of "p", append it to node list."
			while (nodeList[nodeList.length - 1].nextSibling
			&& isAllowedChild(nodeList[nodeList.length - 1].nextSibling, "p")) {
				nodeList.push(nodeList[nodeList.length - 1].nextSibling);
			}

			// "Wrap node list, with sibling criteria returning false and new
			// parent instructions returning the result of calling
			// createElement(tag) on the context object. Set container to the
			// result."
			container = wrap(nodeList,
				function() { return false },
				function() { return document.createElement(tag) }
			);
		}

		// "If container's local name is "address", "listing", or "pre":"
		if (container.tagName == "ADDRESS"
		|| container.tagName == "LISTING"
		|| container.tagName == "PRE") {
			// "Let br be the result of calling createElement("br") on the
			// context object."
			var br = document.createElement("br");

			// "Call insertNode(br) on the active range."
			getActiveRange().insertNode(br);

			// "Call collapse(node, offset + 1) on the context object's
			// Selection."
			getSelection().collapse(node, offset + 1);
			getActiveRange().setStart(node, offset + 1);
			getActiveRange().setEnd(node, offset + 1);

			// "If br is the last descendant of container, let br be the result
			// of calling createElement("br") on the context object, then call
			// insertNode(br) on the active range."
			//
			// Work around browser bugs: some browsers select the
			// newly-inserted node, not per spec.
			if (!isDescendant(nextNode(br), container)) {
				getActiveRange().insertNode(document.createElement("br"));
				getSelection().collapse(node, offset + 1);
				getActiveRange().setEnd(node, offset + 1);
			}

			// "Return true."
			return true;
		}

		// "If container's local name is "li", "dt", or "dd"; and either it has
		// no children or it has a single child and that child is a br:"
		if (["LI", "DT", "DD"].indexOf(container.tagName) != -1
		&& (!container.hasChildNodes()
		|| (container.childNodes.length == 1
		&& isHtmlElement(container.firstChild, "br")))) {
			// "Split the parent of the one-node list consisting of container."
			splitParent([container]);

			// "If container has no children, call createElement("br") on the
			// context object and append the result as the last child of
			// container."
			if (!container.hasChildNodes()) {
				container.appendChild(document.createElement("br"));
			}

			// "If container is a dd or dt, and it is not an allowed child of
			// any of its ancestors in the same editing host, set the tag name
			// of container to the default single-line container name and let
			// container be the result."
			if (isHtmlElement(container, ["dd", "dt"])
			&& getAncestors(container).every(function(ancestor) {
				return !inSameEditingHost(container, ancestor)
					|| !isAllowedChild(container, ancestor)
			})) {
				container = setTagName(container, defaultSingleLineContainerName);
			}

			// "Fix disallowed ancestors of container."
			fixDisallowedAncestors(container);

			// "Return true."
			return true;
		}

		// "Let new line range be a new range whose start is the same as
		// the active range's, and whose end is (container, length of
		// container)."
		var newLineRange = document.createRange();
		newLineRange.setStart(getActiveRange().startContainer, getActiveRange().startOffset);
		newLineRange.setEnd(container, getNodeLength(container));

		// "While new line range's start offset is zero and its start node is
		// not a prohibited paragraph child, set its start to (parent of start
		// node, index of start node)."
		while (newLineRange.startOffset == 0
		&& !isProhibitedParagraphChild(newLineRange.startContainer)) {
			newLineRange.setStart(newLineRange.startContainer.parentNode, getNodeIndex(newLineRange.startContainer));
		}

		// "While new line range's start offset is the length of its start node
		// and its start node is not a prohibited paragraph child, set its
		// start to (parent of start node, 1 + index of start node)."
		while (newLineRange.startOffset == getNodeLength(newLineRange.startContainer)
		&& !isProhibitedParagraphChild(newLineRange.startContainer)) {
			newLineRange.setStart(newLineRange.startContainer.parentNode, 1 + getNodeIndex(newLineRange.startContainer));
		}

		// "Let end of line be true if new line range contains either nothing
		// or a single br, and false otherwise."
		var containedInNewLineRange = getContainedNodes(newLineRange);
		var endOfLine = !containedInNewLineRange.length
			|| (containedInNewLineRange.length == 1
			&& isHtmlElement(containedInNewLineRange[0], "br"));

		// "If the local name of container is "h1", "h2", "h3", "h4", "h5", or
		// "h6", and end of line is true, let new container name be the default
		// single-line container name."
		var newContainerName;
		if (/^H[1-6]$/.test(container.tagName)
		&& endOfLine) {
			newContainerName = defaultSingleLineContainerName;

		// "Otherwise, if the local name of container is "dt" and end of line
		// is true, let new container name be "dd"."
		} else if (container.tagName == "DT"
		&& endOfLine) {
			newContainerName = "dd";

		// "Otherwise, if the local name of container is "dd" and end of line
		// is true, let new container name be "dt"."
		} else if (container.tagName == "DD"
		&& endOfLine) {
			newContainerName = "dt";

		// "Otherwise, let new container name be the local name of container."
		} else {
			newContainerName = container.tagName.toLowerCase();
		}

		// "Let new container be the result of calling createElement(new
		// container name) on the context object."
		var newContainer = document.createElement(newContainerName);

		// "Copy all attributes of container to new container."
		for (var i = 0; i < container.attributes.length; i++) {
			newContainer.setAttributeNS(container.attributes[i].namespaceURI, container.attributes[i].name, container.attributes[i].value);
		}

		// "If new container has an id attribute, unset it."
		newContainer.removeAttribute("id");

		// "Insert new container into the parent of container immediately after
		// container."
		container.parentNode.insertBefore(newContainer, container.nextSibling);

		// "Let contained nodes be all nodes contained in new line range."
		var containedNodes = getAllContainedNodes(newLineRange);

		// "Let frag be the result of calling extractContents() on new line
		// range."
		var frag = newLineRange.extractContents();

		// "Unset the id attribute (if any) of each Element descendant of frag
		// that is not in contained nodes."
		var descendants = getDescendants(frag);
		for (var i = 0; i < descendants.length; i++) {
			if (descendants[i].nodeType == Node.ELEMENT_NODE
			&& containedNodes.indexOf(descendants[i]) == -1) {
				descendants[i].removeAttribute("id");
			}
		}

		// "Call appendChild(frag) on new container."
		newContainer.appendChild(frag);

		// "While container's lastChild is a prohibited paragraph child, set
		// container to its lastChild."
		while (isProhibitedParagraphChild(container.lastChild)) {
			container = container.lastChild;
		}

		// "While new container's lastChild is a prohibited paragraph child,
		// set new container to its lastChild."
		while (isProhibitedParagraphChild(newContainer.lastChild)) {
			newContainer = newContainer.lastChild;
		}

		// "If container has no visible children, call createElement("br") on
		// the context object, and append the result as the last child of
		// container."
		if (![].some.call(container.childNodes, isVisible)) {
			container.appendChild(document.createElement("br"));
		}

		// "If new container has no visible children, call createElement("br")
		// on the context object, and append the result as the last child of
		// new container."
		if (![].some.call(newContainer.childNodes, isVisible)) {
			newContainer.appendChild(document.createElement("br"));
		}

		// "Call collapse(new container, 0) on the context object's Selection."
		getSelection().collapse(newContainer, 0);
		getActiveRange().setStart(newContainer, 0);
		getActiveRange().setEnd(newContainer, 0);

		// "Return true."
		return true;
	}
};

//@}
///// The insertText command /////
//@{
commands.inserttext = {
	action: function(value) {
		// "Delete the selection, with strip wrappers false."
		deleteSelection({stripWrappers: false});

		// "If the active range's start node is neither editable nor an editing
		// host, return true."
		if (!isEditable(getActiveRange().startContainer)
		&& !isEditingHost(getActiveRange().startContainer)) {
			return true;
		}

		// "If value's length is greater than one:"
		if (value.length > 1) {
			// "For each element el in value, take the action for the
			// insertText command, with value equal to el."
			for (var i = 0; i < value.length; i++) {
				commands.inserttext.action(value[i]);
			}

			// "Return true."
			return true;
		}

		// "If value is the empty string, return true."
		if (value == "") {
			return true;
		}

		// "If value is a newline (U+00A0), take the action for the
		// insertParagraph command and return true."
		if (value == "\n") {
			commands.insertparagraph.action();
			return true;
		}

		// "Let node and offset be the active range's start node and offset."
		var node = getActiveRange().startContainer;
		var offset = getActiveRange().startOffset;

		// "If node has a child whose index is offset − 1, and that child is a
		// Text node, set node to that child, then set offset to node's
		// length."
		if (0 <= offset - 1
		&& offset - 1 < node.childNodes.length
		&& node.childNodes[offset - 1].nodeType == Node.TEXT_NODE) {
			node = node.childNodes[offset - 1];
			offset = getNodeLength(node);
		}

		// "If node has a child whose index is offset, and that child is a Text
		// node, set node to that child, then set offset to zero."
		if (0 <= offset
		&& offset < node.childNodes.length
		&& node.childNodes[offset].nodeType == Node.TEXT_NODE) {
			node = node.childNodes[offset];
			offset = 0;
		}

		// "Record current overrides, and let overrides be the result."
		var overrides = recordCurrentOverrides();

		// "Call collapse(node, offset) on the context object's Selection."
		getSelection().collapse(node, offset);
		getActiveRange().setStart(node, offset);
		getActiveRange().setEnd(node, offset);

		// "Canonicalize whitespace at (node, offset)."
		canonicalizeWhitespace(node, offset);

		// "Let (node, offset) be the active range's start."
		node = getActiveRange().startContainer;
		offset = getActiveRange().startOffset;

		// "If node is a Text node:"
		if (node.nodeType == Node.TEXT_NODE) {
			// "Call insertData(offset, value) on node."
			node.insertData(offset, value);

			// "Call collapse(node, offset) on the context object's Selection."
			getSelection().collapse(node, offset);
			getActiveRange().setStart(node, offset);

			// "Call extend(node, offset + 1) on the context object's
			// Selection."
			//
			// Work around WebKit bug: the extend() can throw if the text we're
			// adding is trailing whitespace.
			try { getSelection().extend(node, offset + 1); } catch(e) {}
			getActiveRange().setEnd(node, offset + 1);

		// "Otherwise:"
		} else {
			// "If node has only one child, which is a collapsed line break,
			// remove its child from it."
			//
			// FIXME: IE incorrectly returns false here instead of true
			// sometimes?
			if (node.childNodes.length == 1
			&& isCollapsedLineBreak(node.firstChild)) {
				node.removeChild(node.firstChild);
			}

			// "Let text be the result of calling createTextNode(value) on the
			// context object."
			var text = document.createTextNode(value);

			// "Call insertNode(text) on the active range."
			getActiveRange().insertNode(text);

			// "Call collapse(text, 0) on the context object's Selection."
			getSelection().collapse(text, 0);
			getActiveRange().setStart(text, 0);

			// "Call extend(text, 1) on the context object's Selection."
			getSelection().extend(text, 1);
			getActiveRange().setEnd(text, 1);
		}

		// "Restore states and values from overrides."
		restoreStatesAndValues(overrides);

		// "Canonicalize whitespace at the active range's start, with fix
		// collapsed space false."
		canonicalizeWhitespace(getActiveRange().startContainer, getActiveRange().startOffset, false);

		// "Canonicalize whitespace at the active range's end, with fix
		// collapsed space false."
		canonicalizeWhitespace(getActiveRange().endContainer, getActiveRange().endOffset, false);

		// "If value is a space character, autolink the active range's start."
		if (/^[ \t\n\f\r]$/.test(value)) {
			autolink(getActiveRange().startContainer, getActiveRange().startOffset);
		}

		// "Call collapseToEnd() on the context object's Selection."
		//
		// Work around WebKit bug: sometimes it blows up the selection and
		// throws, which we don't want.
		try { getSelection().collapseToEnd(); } catch(e) {}
		getActiveRange().collapse(false);

		// "Return true."
		return true;
	}
};

//@}
///// The insertUnorderedList command /////
//@{
commands.insertunorderedlist = {
	preservesOverrides: true,
	// "Toggle lists with tag name "ul", then return true."
	action: function() { toggleLists("ul"); return true },
	// "True if the selection's list state is "mixed" or "mixed ul", false
	// otherwise."
	indeterm: function() { return /^mixed( ul)?$/.test(getSelectionListState()) },
	// "True if the selection's list state is "ul", false otherwise."
	state: function() { return getSelectionListState() == "ul" },
};

//@}
///// The justifyCenter command /////
//@{
commands.justifycenter = {
	preservesOverrides: true,
	// "Justify the selection with alignment "center", then return true."
	action: function() { justifySelection("center"); return true },
	indeterm: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if among visible editable nodes that
		// are contained in the result and have no children, at least one has
		// alignment value "center" and at least one does not. Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.some(function(node) { return getAlignmentValue(node) == "center" })
			&& nodes.some(function(node) { return getAlignmentValue(node) != "center" });
	}, state: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if there is at least one visible
		// editable node that is contained in the result and has no children,
		// and all such nodes have alignment value "center".  Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.length
			&& nodes.every(function(node) { return getAlignmentValue(node) == "center" });
	}, value: function() {
		// "Return the empty string if the active range is null.  Otherwise,
		// block-extend the active range, and return the alignment value of the
		// first visible editable node that is contained in the result and has
		// no children. If there is no such node, return "left"."
		if (!getActiveRange()) {
			return "";
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		if (nodes.length) {
			return getAlignmentValue(nodes[0]);
		} else {
			return "left";
		}
	},
};

//@}
///// The justifyFull command /////
//@{
commands.justifyfull = {
	preservesOverrides: true,
	// "Justify the selection with alignment "justify", then return true."
	action: function() { justifySelection("justify"); return true },
	indeterm: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if among visible editable nodes that
		// are contained in the result and have no children, at least one has
		// alignment value "justify" and at least one does not. Otherwise
		// return false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.some(function(node) { return getAlignmentValue(node) == "justify" })
			&& nodes.some(function(node) { return getAlignmentValue(node) != "justify" });
	}, state: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if there is at least one visible
		// editable node that is contained in the result and has no children,
		// and all such nodes have alignment value "justify".  Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.length
			&& nodes.every(function(node) { return getAlignmentValue(node) == "justify" });
	}, value: function() {
		// "Return the empty string if the active range is null.  Otherwise,
		// block-extend the active range, and return the alignment value of the
		// first visible editable node that is contained in the result and has
		// no children. If there is no such node, return "left"."
		if (!getActiveRange()) {
			return "";
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		if (nodes.length) {
			return getAlignmentValue(nodes[0]);
		} else {
			return "left";
		}
	},
};

//@}
///// The justifyLeft command /////
//@{
commands.justifyleft = {
	preservesOverrides: true,
	// "Justify the selection with alignment "left", then return true."
	action: function() { justifySelection("left"); return true },
	indeterm: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if among visible editable nodes that
		// are contained in the result and have no children, at least one has
		// alignment value "left" and at least one does not. Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.some(function(node) { return getAlignmentValue(node) == "left" })
			&& nodes.some(function(node) { return getAlignmentValue(node) != "left" });
	}, state: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if there is at least one visible
		// editable node that is contained in the result and has no children,
		// and all such nodes have alignment value "left".  Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.length
			&& nodes.every(function(node) { return getAlignmentValue(node) == "left" });
	}, value: function() {
		// "Return the empty string if the active range is null.  Otherwise,
		// block-extend the active range, and return the alignment value of the
		// first visible editable node that is contained in the result and has
		// no children. If there is no such node, return "left"."
		if (!getActiveRange()) {
			return "";
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		if (nodes.length) {
			return getAlignmentValue(nodes[0]);
		} else {
			return "left";
		}
	},
};

//@}
///// The justifyRight command /////
//@{
commands.justifyright = {
	preservesOverrides: true,
	// "Justify the selection with alignment "right", then return true."
	action: function() { justifySelection("right"); return true },
	indeterm: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if among visible editable nodes that
		// are contained in the result and have no children, at least one has
		// alignment value "right" and at least one does not. Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.some(function(node) { return getAlignmentValue(node) == "right" })
			&& nodes.some(function(node) { return getAlignmentValue(node) != "right" });
	}, state: function() {
		// "Return false if the active range is null.  Otherwise, block-extend
		// the active range. Return true if there is at least one visible
		// editable node that is contained in the result and has no children,
		// and all such nodes have alignment value "right".  Otherwise return
		// false."
		if (!getActiveRange()) {
			return false;
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		return nodes.length
			&& nodes.every(function(node) { return getAlignmentValue(node) == "right" });
	}, value: function() {
		// "Return the empty string if the active range is null.  Otherwise,
		// block-extend the active range, and return the alignment value of the
		// first visible editable node that is contained in the result and has
		// no children. If there is no such node, return "left"."
		if (!getActiveRange()) {
			return "";
		}
		var nodes = getAllContainedNodes(blockExtend(getActiveRange()), function(node) {
			return isEditable(node) && isVisible(node) && !node.hasChildNodes();
		});
		if (nodes.length) {
			return getAlignmentValue(nodes[0]);
		} else {
			return "left";
		}
	},
};

//@}
///// The outdent command /////
//@{
commands.outdent = {
	preservesOverrides: true,
	action: function() {
		// "Let items be a list of all lis that are ancestor containers of the
		// range's start and/or end node."
		//
		// It's annoying to get this in tree order using functional stuff
		// without doing getDescendants(document), which is slow, so I do it
		// imperatively.
		var items = [];
		(function(){
			for (
				var ancestorContainer = getActiveRange().endContainer;
				ancestorContainer != getActiveRange().commonAncestorContainer;
				ancestorContainer = ancestorContainer.parentNode
			) {
				if (isHtmlElement(ancestorContainer, "li")) {
					items.unshift(ancestorContainer);
				}
			}
			for (
				var ancestorContainer = getActiveRange().startContainer;
				ancestorContainer;
				ancestorContainer = ancestorContainer.parentNode
			) {
				if (isHtmlElement(ancestorContainer, "li")) {
					items.unshift(ancestorContainer);
				}
			}
		})();

		// "For each item in items, normalize sublists of item."
		items.forEach(normalizeSublists);

		// "Block-extend the active range, and let new range be the result."
		var newRange = blockExtend(getActiveRange());

		// "Let node list be a list of nodes, initially empty."
		//
		// "For each node node contained in new range, append node to node list
		// if the last member of node list (if any) is not an ancestor of node;
		// node is editable; and either node has no editable descendants, or is
		// an ol or ul, or is an li whose parent is an ol or ul."
		var nodeList = getContainedNodes(newRange, function(node) {
			return isEditable(node)
				&& (!getDescendants(node).some(isEditable)
				|| isHtmlElement(node, ["ol", "ul"])
				|| (isHtmlElement(node, "li") && isHtmlElement(node.parentNode, ["ol", "ul"])));
		});

		// "While node list is not empty:"
		while (nodeList.length) {
			// "While the first member of node list is an ol or ul or is not
			// the child of an ol or ul, outdent it and remove it from node
			// list."
			while (nodeList.length
			&& (isHtmlElement(nodeList[0], ["OL", "UL"])
			|| !isHtmlElement(nodeList[0].parentNode, ["OL", "UL"]))) {
				outdentNode(nodeList.shift());
			}

			// "If node list is empty, break from these substeps."
			if (!nodeList.length) {
				break;
			}

			// "Let sublist be a list of nodes, initially empty."
			var sublist = [];

			// "Remove the first member of node list and append it to sublist."
			sublist.push(nodeList.shift());

			// "While the first member of node list is the nextSibling of the
			// last member of sublist, and the first member of node list is not
			// an ol or ul, remove the first member of node list and append it
			// to sublist."
			while (nodeList.length
			&& nodeList[0] == sublist[sublist.length - 1].nextSibling
			&& !isHtmlElement(nodeList[0], ["OL", "UL"])) {
				sublist.push(nodeList.shift());
			}

			// "Record the values of sublist, and let values be the result."
			var values = recordValues(sublist);

			// "Split the parent of sublist, with new parent null."
			splitParent(sublist);

			// "Fix disallowed ancestors of each member of sublist."
			sublist.forEach(fixDisallowedAncestors);

			// "Restore the values from values."
			restoreValues(values);
		}

		// "Return true."
		return true;
	}
};

//@}

//////////////////////////////////
///// Miscellaneous commands /////
//////////////////////////////////

///// The defaultParagraphSeparator command /////
//@{
commands.defaultparagraphseparator = {
	action: function(value) {
		// "Let value be converted to ASCII lowercase. If value is then equal
		// to "p" or "div", set the context object's default single-line
		// container name to value and return true. Otherwise, return false."
		value = value.toLowerCase();
		if (value == "p" || value == "div") {
			defaultSingleLineContainerName = value;
			return true;
		}
		return false;
	}, value: function() {
		// "Return the context object's default single-line container name."
		return defaultSingleLineContainerName;
	},
};

//@}
///// The selectAll command /////
//@{
commands.selectall = {
	// Note, this ignores the whole globalRange/getActiveRange() thing and
	// works with actual selections.  Not suitable for autoimplementation.html.
	action: function() {
		// "Let target be the body element of the context object."
		var target = document.body;

		// "If target is null, let target be the context object's
		// documentElement."
		if (!target) {
			target = document.documentElement;
		}

		// "If target is null, call getSelection() on the context object, and
		// call removeAllRanges() on the result."
		if (!target) {
			getSelection().removeAllRanges();

		// "Otherwise, call getSelection() on the context object, and call
		// selectAllChildren(target) on the result."
		} else {
			getSelection().selectAllChildren(target);
		}

		// "Return true."
		return true;
	}
};

//@}
///// The styleWithCSS command /////
//@{
commands.stylewithcss = {
	action: function(value) {
		// "If value is an ASCII case-insensitive match for the string
		// "false", set the CSS styling flag to false. Otherwise, set the
		// CSS styling flag to true.  Either way, return true."
		cssStylingFlag = String(value).toLowerCase() != "false";
		return true;
	}, state: function() { return cssStylingFlag }
};

//@}
///// The useCSS command /////
//@{
commands.usecss = {
	action: function(value) {
		// "If value is an ASCII case-insensitive match for the string "false",
		// set the CSS styling flag to true. Otherwise, set the CSS styling
		// flag to false.  Either way, return true."
		cssStylingFlag = String(value).toLowerCase() == "false";
		return true;
	}
};
//@}

// Some final setup
//@{
(function() {
// Opera 11.50 doesn't implement Object.keys, so I have to make an explicit
// temporary, which means I need an extra closure to not leak the temporaries
// into the global namespace.  >:(
var commandNames = [];
for (var command in commands) {
	commandNames.push(command);
}
commandNames.forEach(function(command) {
	// "If a command does not have a relevant CSS property specified, it
	// defaults to null."
	if (!("relevantCssProperty" in commands[command])) {
		commands[command].relevantCssProperty = null;
	}

	// "If a command has inline command activated values defined but nothing
	// else defines when it is indeterminate, it is indeterminate if among
	// formattable nodes effectively contained in the active range, there is at
	// least one whose effective command value is one of the given values and
	// at least one whose effective command value is not one of the given
	// values."
	if ("inlineCommandActivatedValues" in commands[command]
	&& !("indeterm" in commands[command])) {
		commands[command].indeterm = function() {
			if (!getActiveRange()) {
				return false;
			}

			var values = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)
				.map(function(node) { return getEffectiveCommandValue(node, command) });

			var matchingValues = values.filter(function(value) {
				return commands[command].inlineCommandActivatedValues.indexOf(value) != -1;
			});

			return matchingValues.length >= 1
				&& values.length - matchingValues.length >= 1;
		};
	}

	// "If a command has inline command activated values defined, its state is
	// true if either no formattable node is effectively contained in the
	// active range, and the active range's start node's effective command
	// value is one of the given values; or if there is at least one
	// formattable node effectively contained in the active range, and all of
	// them have an effective command value equal to one of the given values."
	if ("inlineCommandActivatedValues" in commands[command]) {
		commands[command].state = function() {
			if (!getActiveRange()) {
				return false;
			}

			var nodes = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode);

			if (nodes.length == 0) {
				return commands[command].inlineCommandActivatedValues
					.indexOf(getEffectiveCommandValue(getActiveRange().startContainer, command)) != -1;
			} else {
				return nodes.every(function(node) {
					return commands[command].inlineCommandActivatedValues
						.indexOf(getEffectiveCommandValue(node, command)) != -1;
				});
			}
		};
	}

	// "If a command is a standard inline value command, it is indeterminate if
	// among formattable nodes that are effectively contained in the active
	// range, there are two that have distinct effective command values. Its
	// value is the effective command value of the first formattable node that
	// is effectively contained in the active range; or if there is no such
	// node, the effective command value of the active range's start node; or
	// if that is null, the empty string."
	if ("standardInlineValueCommand" in commands[command]) {
		commands[command].indeterm = function() {
			if (!getActiveRange()) {
				return false;
			}

			var values = getAllEffectivelyContainedNodes(getActiveRange())
				.filter(isFormattableNode)
				.map(function(node) { return getEffectiveCommandValue(node, command) });
			for (var i = 1; i < values.length; i++) {
				if (values[i] != values[i - 1]) {
					return true;
				}
			}
			return false;
		};

		commands[command].value = function() {
			if (!getActiveRange()) {
				return "";
			}

			var refNode = getAllEffectivelyContainedNodes(getActiveRange(), isFormattableNode)[0];

			if (typeof refNode == "undefined") {
				refNode = getActiveRange().startContainer;
			}

			var ret = getEffectiveCommandValue(refNode, command);
			if (ret === null) {
				return "";
			}
			return ret;
		};
	}

	// "If a command preserves overrides, then before taking its action, the
	// user agent must record current overrides. After taking the action, if
	// the active range is collapsed, it must restore states and values from
	// the recorded list."
	if ("preservesOverrides" in commands[command]) {
		var oldAction = commands[command].action;

		commands[command].action = function(value) {
			var overrides = recordCurrentOverrides();
			var ret = oldAction(value);
			if (getActiveRange().collapsed) {
				restoreStatesAndValues(overrides);
			}
			return ret;
		};
	}
});
})();
//@}

// vim: foldmarker=@{,@} foldmethod=marker