I plan to turn on @supports selector() function for all release channels.
See the following link for the intent to implement and relevant discussion:
https://groups.google.com/d/msg/mozilla.dev.platform/JNLPcIZRd2w/r6Boq0h2BQAJ
There are various WPT tests for this in css/css-conditional and
css/cssom. Spec lives at:
https://drafts.csswg.org/css-conditional-4/#at-supports-ext
The CSSWG discussed this F2F at the beginning of June, and was fine with
shipping this. Spec-wise conditional-4 and conditional-3 should be
merged and such as discussed in:
https://log.csswg.org/irc.w3.org/css/2019-06-07/#e1190776
I'll get to that. But I don't see a reason for not doing this.
I filed bugs on other engines:
* https://bugs.webkit.org/show_bug.cgi?id=199237
* https://bugs.chromium.org/p/chromium/issues/detail?id=979041
-- Emilio
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