[render-blocking] Fix implicitly-render-blocking definition.

As per discussion in #10145.

source

@@ -1838,6 +1838,9 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    <li><p>If <var>removedNode</var>'s <code data-x="attr-popover">popover</code> attribute is not in
    the <span data-x="attr-popover-none-state">no popover state</span>, then run the <span>hide
    popover algorithm</span> given <var>removedNode</var>, false, false, and false.</p></li>
+
+   <li><p>Set <var>removedNode</var>'s <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> internal
+   slot value to false.</p></li>
   </ol>
 
   <p>A <dfn id="insert-an-element-into-a-document" data-x="node is inserted into a document"
@@ -7763,10 +7766,15 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    data-x="possible blocking token">possible blocking tokens</span>.</p>
   </ol>
 
+  <p>Elements have an <dfn>[[ImplicitlyPotentiallyRenderBlocking]]</dfn> slot, initially false.
+  Individual elements might set this slot to true.</p>
+
+  <p>An element is <dfn>explicitly potentially render-blocking</dfn> </p>
+
   <p>An element is <dfn>potentially render-blocking</dfn> if its <span>blocking tokens set</span>
   contains "<code data-x="blocking-token-render">render</code>", or if it is
-  <dfn>implicitly potentially render-blocking</dfn>, which will be defined at the individual
-  elements. By default, an element is not <span>implicitly potentially render-blocking</span>.</p>
+  <dfn>implicitly potentially render-blocking</dfn>. Elements are not <span>implicitly potentially
+  render-blocking</span> by default.</p>
 
   <h4>Fetch priority attributes</h4>
 
@@ -17592,8 +17600,12 @@ console.log(style.disabled); // false</code></pre>
   <p>The <span>child text content</span> of a <code>style</code> element must be that of a
   <span>conformant style sheet</span>.</p>
 
-  <p>A <code>style</code> element is <span>implicitly potentially render-blocking</span> if the
-  element was created by its <span>node document</span>'s parser.</p>
+  <p>A <code>style</code> element on creation sets its
+  <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> slot to true if the element was created by
+  its <span>node document</span>'s parser.</p>
+
+  <p>A <code>style</code> element is <span>implicitly potentially render-blocking</span> if its
+  <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> slot is true.</p>
 
   <hr>
 
@@ -27728,8 +27740,12 @@ document.body.appendChild(wbr);</code></pre>
   <p>The default type for resources given by the <code data-x="rel-stylesheet">stylesheet</code>
   keyword is <code>text/css</code>.</p>
 
-  <p>A <code>link</code> element of this type is <span>implicitly potentially render-blocking</span>
-  if the element was created by its <span>node document</span>'s parser.</p>
+  <p>A <code>link</code> element on creation sets its
+  <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> slot to true if the element was created by
+  its <span>node document</span>'s parser.</p>
+
+  <p>A <code>link</code> element is <span>implicitly potentially render-blocking</span> if its
+  <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> slot is true.</p>
 
   <div w-nodev>
 
@@ -62237,11 +62253,16 @@ o............A....e
 
   <hr>
 
+  <p>A <code>script</code> element on creation sets its
+  <span>[[ImplicitlyPotentiallyRenderBlocking]]</span> slot to true if the element was created by
+  its <span>node document</span>'s parser.</p>
+
   <p>A <code>script</code> element <var>el</var> is <span>implicitly potentially
-  render-blocking</span> if <var>el</var>'s <span data-x="concept-script-type">type</span> is
-  "<code data-x="">classic</code>", <var>el</var> is <span>parser-inserted</span>, and
-  <var>el</var> does not have an <code data-x="attr-script-async">async</code> or <code
-  data-x="attr-script-defer">defer</code> attribute.</p>
+  render-blocking</span> if <var>el</var>'s <span>[[ImplicitlyPotentiallyRenderBlocking]]</span>
+  slot is true, <var>el</var>'s <span data-x="concept-script-type">type</span> is
+  "<code data-x="">classic</code>", and <var>el</var> does not have an
+  <code data-x="attr-script-async">async</code> or <code data-x="attr-script-defer">defer</code>
+  attribute.</p>
 
   <p>The <span data-x="concept-node-clone-ext">cloning steps</span> for a <code>script</code>
   element <var>el</var> being cloned to a copy <var>copy</var> are to set <var>copy</var>'s