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[web-animations-1] Reject old-style :before pseudo-element syntax #4472

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birtles opened this issue Oct 30, 2019 · 1 comment
Open

[web-animations-1] Reject old-style :before pseudo-element syntax #4472

birtles opened this issue Oct 30, 2019 · 1 comment
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web-animations-1

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@birtles
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birtles commented Oct 30, 2019

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.
@birtles birtles mentioned this issue Oct 30, 2019
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@Loirooriol
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This seems also relevant for Element.pseudo().

fantasai added a commit that referenced this issue Mar 6, 2020
@fantasai
[css-color-adjust-1] Force opaque background if color-adjust mismatch…
d2c4814 
…es between iframe and embedded doc. #4472
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