Re: [csswg-drafts] [css-contain] Allow container query style features to evaluate in a boolean? (#8127)

  > The term supported CSS property refers to a CSS property that the user agent implements, including any vendor-prefixed properties, **but excluding custom properties**.

https://drafts.csswg.org/cssom-1/#supported-css-property

I borrowed *if it accepts that property in a style rule* from the prose in CSS Conditionals 3 for `<supports-decl>`, which I would be fine if its result would be defined as true if the declaration is successfully parsed against `<declaration>`, defined as matching a declaration whose value is valid according to the grammar of the property that corresponds to its name.

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Received on Wednesday, 26 April 2023 07:39:55 UTC