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[css-values-5] Disallow whitespace in <attr-name> #11431

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Jan 14, 2025
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3 changes: 3 additions & 0 deletions css-values-5/Overview.bs
Original file line number Diff line number Diff line change
Expand Up @@ -1588,6 +1588,9 @@ Ian's proposal:
As with [=attribute selectors=],
the case-sensitivity of <<attr-name>> depends on the document language.

Whitespace is not allowed
between any of the components of <<attr-name>>.

If ''attr()'' is used in a property applied to an element,
it references the attribute of the given name on that element;
if applied to a pseudo-element,
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