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http://www.w3.org/TR/html401/struct/text.html#h-9.4 If we try to validate the following as XHTML1 or HTML4 <h1><h2>Foo</h2></h1> then we get differene answer: [XHTML1 validator:] Line 9, Column 8: document type does not allow element "h2" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag [HTML4 validator:] Line 9, Column 8: document type does not allow element "H2" here; missing one of "APPLET", "OBJECT", "MAP", "IFRAME", "BUTTON" start-tag It is not logical that the XHTML1 validator permits <ins> and <del> here. Were is the justification for that? HTML4 should here be identical. See justification here: http://lists.w3.org/Archives/Public/public-html/2010Jun/0639.html Summary: "The purpose of <ins> and <del> is not to document that the author corrected his/her code from illegal code//impossible DOM to legal code/possible DOM!"
To back up my claim about an error, I'll point out that the example given in HTML4.01 as an example of _illegal_ markup, currently is stamped as *valid* - both by the XHTML1.x validaton service and the HTML4.01 validation service. This is the example code from HTML401 (in lowercase, for XHTML compatibility): <p> <ins><div>...block-level content...</div></ins> </p> (The example is found here: http://www.w3.org/TR/html401/struct/text.html#h-9.4) As further back-up, I'll mention that Validator.nu agrees with my interpretation of HTML4.01 - if you try to validate the the HTML4 example as XHTML 1.0 Strict in the Validator.nu service, you get the following message: ]] XHTML element div not allowed as child of XHTML element ins in this context. (Suppressing further errors from this subtree.) From line 8, column 6; to line 8, column 10 ↩<p>↩<ins><div>...blo [[
As confirmation of my claim that Valdiator.nu supports my interpretation, if we change the <ins> in the HTML4.01 example to an <object> element, then Validator.nu stamps it as valid: <p> <object data="image" type="image/gif" ><div>...block-level content...</div></object> </p> then the Validator.nu service stamps it as valid HTML401 and valid XHTML1. Brilliant, Henri!
The XHTML 1.0 DTD does allow ins and del in h1, so this is not a validator bug. http://www.w3.org/TR/xhtml1/dtds.html#dtdentry_xhtml1-strict.dtd_h1 http://www.w3.org/TR/xhtml1/dtds.html#dtdentry_xhtml1-strict.dtd_Inline http://www.w3.org/TR/xhtml1/dtds.html#dtdentry_xhtml1-strict.dtd_misc.inline The HTML 4.01 DTD on the other hand does not. http://www.w3.org/TR/html401/struct/global.html#edef-H1 http://www.w3.org/TR/html401/sgml/dtd.html#inline (ins an del are not in %fontstyle;, %phrase;, %special;, or %formctrl;).