While still requiring significant work, this allows us to keep track of progress more properly in wpt.fyi, and this is not an stability hazard. So let's try this.

Even though it still requires significant work, this allows us to keep
track of progress more properly in wpt.fyi.

Since we expect implementation progress to improve quite a bit in H2,
and this shouldn't be an stability hazard, this seems fine unless the
missing bits cause big compat issues.

Backed out for causing mochitest failures on test_interfaces.html, test_interfaces_secureContext.html

Backout link

Push with failures

Failure log

When landed, this should be mentioned in https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features.

Sebastian

https://hg.mozilla.org/mozilla-central/rev/96efb14c1b2e

Documentation for these changes can be tracked in the following GitHub issue: https://github.com/mdn/content/issues/27756

The experimental note has landed already and there's a BCD PR open.

Could I get confirmation that the following are the only APIs enabled by this pref (details in the BCD PR, pasting here for convenience):

• CSSPropertyRule

• CSSPropertyRule.inherits

• CSSPropertyRule.initialvalue

• CSSPropertyRule.name

• CSSPropertyRule.syntax

• registerProperty()

Thank you :)

It also enables the declarative / CSS syntax, but yeah that looks about right.

It also enables the declarative / CSS syntax

Of course, thanks for pointing it out. I've updated the browser compat PR for the at-rule & descriptors, also. Thank you.