Summary: This fixes rather confusing CSS nesting behavior, see [1] and
all related discussions.
Bug: https://bugzil.la/1918408
Standard: https://drafts.csswg.org/css-nesting-1/#nested-declarations-rule
Standards Body: CSSWG (W3C)
Platforms: All
Preference: No, it was rather invasive to the parser and I think the
real risk of breakage is not too big.
DevTools bug: Some work going on in bug 1919853, some more to do.
Links to standards-positions:
* https://github.com/mozilla/standards-positions/issues/1048
Other browsers:
* Blink has this enabled by default (to be shipped to release still).
* WebKit is supportive of this
(https://github.com/WebKit/standards-positions/issues/369)
WPT: This is part now of interop 2024, and there are existing tests in
css/css-nesting/.
Cheers,
-- Emilio
[1]: https://github.com/w3c/csswg-drafts/issues/8738
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