Re: [csswg-drafts] [css-env][css-conditional] Need an approach to check whether an environment variable is supported (#3576) from Lea Verou via GitHub on 2025-07-09 (public-css-archive@w3.org from July 2025)

From: Lea Verou via GitHub <noreply@w3.org>
Date: Wed, 09 Jul 2025 15:53:53 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-3053170690-1752076430-noreply@w3.org>

Apologies if I missed it, what’s the downside for making the check parse-time? So far it seems there are only benefits.

As to whether the fallback value suffices, the entire reason we have `@supports` in the first place is because it often doesn't. Otherwise authors can always use fallback values and duplicate declarations to provide fallbacks for the specific property being used. But often the fallback involves use of other properties entirely.

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Received on Wednesday, 9 July 2025 15:53:54 UTC