Editorial: use comma in "Otherwise, if ..."

There are 200+ cases of this, and only these 3 exceptions.

source

@@ -4730,7 +4730,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    namespace declaration in the expression context. </p>
 
    <p>If the QName has no prefix and the principal node type of the axis is element, then the
-   default element namespace is used. Otherwise if the QName has no prefix, the namespace URI is
+   default element namespace is used. Otherwise, if the QName has no prefix, the namespace URI is
    null. The default element namespace is a member of the context for the XPath expression. The
    value of the default element namespace when executing an XPath expression through the DOM3 XPath
    API is determined in the following way:</p>
@@ -6604,7 +6604,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
         U+0073 LATIN SMALL LETTER S character, set <var>units</var> to <i>seconds</i> and
         set <var>M-disambiguator</var> to <i>minutes</i>.</p>
 
-        <p>Otherwise if <var>next character</var> is none of the above characters, then
+        <p>Otherwise, if <var>next character</var> is none of the above characters, then
         fail.</p>
        </li>
       </ol>
@@ -52520,7 +52520,7 @@ You cannot submit this form when the field is incorrect.</samp></pre>
   data-x="attr-input-type">type</code> attribute's current state, then throw an
   <span>"<code>InvalidStateError</code>"</span> <code>DOMException</code>; otherwise, if the new
   value is not null and not a <code >Date</code> object throw a <code>TypeError</code> exception;
-  otherwise if the new value is null or a <code>Date</code> object representing the NaN time value,
+  otherwise, if the new value is null or a <code>Date</code> object representing the NaN time value,
   then set the <span data-x="concept-fe-value">value</span> of the element to the empty string;
   otherwise, run the <span data-x="concept-input-value-date-string">algorithm to convert a
   <code>Date</code> object to a string</span>, as defined for that state, on the new value, and set