On Monday 2006-01-09 15:07 -0500, Adam Kuehn wrote:
> Darn it.  I hit "send" by mistake, before I verified this 
> claim.  That is, of course, not correct.  Only one ID per element is 
> allowed.  I hate having to print retractions, but that's what I get 
> for doing this stuff while I'm busy with other things.  Apologies, all.

This statement can be made more generally:  documents must not repeat an
attribute name within the same tag.

In the XML spec, this is a well-formedness constraint:
  # Well-formedness constraint: Unique Att Spec
  # 
  # An attribute name MUST NOT appear more than once in the same start-tag
  # or empty-element tag.
  -- http://www.w3.org/TR/REC-xml/#uniqattspec

I suspect SGML (on which HTML4 is technically based) says something
about it as well.  At the very least, the W3C validator gives the
nsgmls or SP error message:
  # duplicate specification of attribute "CLASS".

-David

-- 
L. David Baron                                <URL: http://dbaron.org/ >
           Technical Lead, Layout & CSS, Mozilla Corporation

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