Turn on supports conditions in CSS imports (@import supports(...)) by default.

Spec: https://www.w3.org/TR/css-cascade-4/#conditional-import

Intent needed.

MDN changes:

• No compat data exists for the feature itself (https://developer.mozilla.org/en-US/docs/Web/CSS/@import#browser_compatibility)
• The new CSSImportRule attribute (supportsText) has no docs (https://developer.mozilla.org/en-US/docs/Web/API/CSSImportRule)

Enabled supports conditions in CSS imports (@import supports(...)) by default.

Intent to ship: https://groups.google.com/a/mozilla.org/g/dev-platform/c/ee9M0DJrNDQ

https://hg.mozilla.org/mozilla-central/rev/08207806be4c

Release Note Request (optional, but appreciated)
[Why is this notable]: New CSS feature shipped on by default (in 115)
[Affects Firefox for Android]: Yes
[Suggested wording]: Not sure. For reference, no other browsers implement or ship this at all (yet).
[Links (documentation, blog post, etc)]: No good docs/posts yet?

:canadahonk thanks for the release note nomination, could you provide some suggested wording as a starting point?
Maybe the code reviewer can help you?

Could have something like "Supports conditions are now supported in (CSS) import rules (@import supports(...))"?

Related Pull Requests

Experimental Release PR 27349
BCD PR 20132
Content PR 27075

Wrongly added this to the wrong issue

Related (correct) Pull Requests

• BCD
• Content
• Firefox Release