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2063[Authors] [Conformance Checkers] Allow xml:lang= in HTML in certain very specific cases to ease migration.2008-08-12 22:46
@@ -5807,27 +5807,38 @@ http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C%21DOCTYPE%20html%3E..
   that the primary language is unknown.</p>
 
   <p>The <code title="attr-lang">lang</code> attribute may be used on
   any <span title="HTML elements">HTML element</span>.</p>
 
   <p>The <code title="attr-xml-lang">xml:lang</code> attribute may be
   used on <span>HTML elements</span> in <span>XML documents</span>, as
   well as elements in other namespaces if the relevant specifications
   allow it (in particular, MathML and SVG allow <code
   title="attr-xml-lang">xml:lang</code> attributes to be specified on
-  their elements). Authors must not use the <code
-  title="attr-xml-lang">xml:lang</code> attribute in <span>HTML
-  documents</span>. If both the <code title="attr-lang">lang</code>
+  their elements). If both the <code title="attr-lang">lang</code>
   attribute and the <code title="attr-xml-lang">xml:lang</code>
   attribute are specified on the same element, they must have exactly
   the same value.</p>
 
+  <p>Authors must not use the <code
+  title="attr-xml-lang">xml:lang</code> attribute (that is, the <code
+  title="">lang</code> attribute with the <code title="">xml</code>
+  prefix in the <code
+  title="">http://www.w3.org/XML/1998/namespace</code> namespace) in
+  <span>HTML documents</span>. To ease migration to and from XHTML,
+  authors may specify an attribute in no namespace with no prefix and
+  with the localname <code title="">xml:lang</code> on <span>HTML
+  elements</span> in <span>HTML documents</span>, but such attributes
+  must only be specified if a <code title="attr-lang">lang</code>
+  attribute is also specified, and both attributes must have the same
+  value.</p>
+
   <hr>
 
   <p>To determine the language of a node, user agents must look at the
   nearest ancestor element (including the element itself if the node
   is an element) that has an <code
   title="attr-xml-lang">xml:lang</code> attribute set or is an <span
   title="HTML elements">HTML element</span> and has a <code
   title="attr-lang">lang</code> attribute set. That attribute
   specifies the language of the node.</p>
 

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