[whatwg] Empty elements
simonp at opera.com
Mon Aug 29 02:24:06 PDT 2011
On Sun, 28 Aug 2011 19:45:50 +0200, Jukka K. Korpela <jkorpela at cs.tut.fi>
> 28.8.2011 17:52, Aryeh Gregor wrote:
>> "Void" is correct:
> I see. What a pointless and confusing change (from HTML tradition and
> SGML usage). "Empty" is descriptive (an element that has no content, or
> has empty content), whereas "void" suggests associations like "null and
> void" or "void pointer". This is about elements that are very real and
> meaningful, instead of being "void" in any normal meaning - they just
> express everything they can express by their name and attributes
<p></p> is an empty element since it has no content, but p is not a void
Maybe void isn't a great term, but empty isn't either.
>> Documents served with a text/html MIME type must obey the HTML syntax
>> rules, not XHTML. I couldn't find where the spec says this
>> normatively, but there's an informative note at the top of the HTML
>> syntax and XHTML syntax sections.
> So does this mean that the rules are, after all, different for HTML
> serialization than for XHTML serialization?
After all? They have always been different...
>> If you're serving a document with an XML MIME type,<foo></foo> is
>> equivalent to <foo /> for any value of foo. The validator won't
>> distinguish and neither will UAs, so use whichever you please.
>> They're entirely different with an HTML MIME type, and that cannot be
>> changed at this point due to compatibility.
> Is there any way to tell validator.nu or the W3C Validator in HTML5 mode
> to apply XHTML rules when submitting a document via a text field or via
> file upload?
In http://validator.nu/ you can choose "XML" or "HTML" under Parser.
> Is there any requirement on such a distinction?
> When validating via URL, the W3C Validator (in HTML5 mode) indeed
> accepts <p /> when Content-Type: application/xhtml+xml. However,
> validator.nu responds:
> IO Error: Non-HTML Content-Type: application/xhtml+xml.
> This is getting rather confusing...
I guess you chose the "HTML5" parser in validator.nu, which will not
accept an XML MIME type (you need the XML parser for XML). I think the W3C
validator doesn't have a way to choose between XML and HTML in "HTML5
mode", it will decide from the MIME type (dunno what it does for file
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