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CSS Working Group Editor Drafts
https://drafts.csswg.org/
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[web-animations-1] Reject old-style `:before` pseudo-element syntax #4472

Open birtles opened 5 years ago

birtles commented 5 years ago

Background is the discussion in #4437.

As of that change, KeyframeEffect now has a pseudoElement member whose syntax is defined by Selectors Level 4.

That definition requires UAs to accept the old single colon syntax (:before) as well as the double colon syntax (::before).

I was under the impression we wanted to phase that historical artifact out of the web platform so that new APIs like this should reject :before and only accept ::before.

Loirooriol commented 5 years ago

This seems also relevant for Element.pseudo().