[wp-trac] [WordPress Trac] #6592: IDs must begin with a letter in HTML/XHTML, but _wp_unfiltered_html_comment does not.

[WordPress Trac]

#6592: IDs must begin with a letter in HTML/XHTML, but _wp_unfiltered_html_comment
does not.
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 Reporter:  guillep2k  |       Owner:  anonymous
     Type:  defect     |      Status:  new      
 Priority:  normal     |   Milestone:  2.7      
Component:  General    |     Version:  2.5      
 Severity:  normal     |    Keywords:           
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 The comments section uses a hidden field with name
 _wp_unfiltered_html_comment. Although the W3C validator doesn't mark it as
 an error, XHTML/HTML IDs must begin with a letter (we can say even the W3C
 validator is not perfect!).

 The HTML specification, at section 6.2
 (http://www.w3.org/TR/html401/types.html#type-id), clearly states that all
 IDs must start with a letter. For XHTML you have to dig a little deeper:
 at section 4.10 (http://www.w3.org/TR/xhtml1/#h-4.10) it says "in XHTML
 1.0 the id attribute is defined to be of type ID"; then in XML
 specification you must follow the ID type (http://www.w3.org/TR/2000/REC-
 xml-20001006#id) to "Names and Tokens" (http://www.w3.org/TR/2000/REC-
 xml-20001006#NT-Name), where it says "[5] Name ::= (Letter | '_' | ':')
 (NameChar?)*", ruling out IDs starting with underscores. Therefore, I
 think that the _wp_unfiltered_html_comment id breaks XHTML validity. In
 any case, changing it "to be 100% sure" wouldn't hurt. ;) The affected
 files are only two: wp-comments-post.php:38 and comment-template.php:610
 (as of version 2.5).

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Ticket URL: <http://trac.wordpress.org/ticket/6592>
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