[cssom][css-conditional] Should there be an interface for @supports rules?

[bzbarsky]

https://drafts.csswg.org/cssom/#cssgroupingrule has no concept of @supports rules. Maybe it should.

The way this works in Gecko is that there is a CSSConditionRule interface which inherits from CSSGroupingRule and has .conditionText on it. Inheriting from this are CSSMediaRule and CSSSupportsRule; the latter is an empty interface for now.

[dbaron]

Also see:

• Minutes 2012-08-13, where the CSSWG resolved to add CSSConditionRule and have a common .conditionText
• Minutes 2012-09-05, where the CSSWG resolved to split CSSConditionRule into CSSConditionRule and CSSGroupRule
• my email of 2012-12-06, explaining some spec prose related to .conditionText
• @zcorpan's email 2013-06-18 suggesting to drop CSSConditionRule

Also note that the Conditional Rules spec has a section on APIs that does add a bunch of these interfaces.

[bzbarsky]

Aha, Conditional Rules is what I was looking for

[tabatkins]

Issue superceded by #851