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I wrote an article about CSS feature queries, what happens when we add new syntax to the @-supports rule, and anyway: what is the opposite of an unknown? I hope you find it useful, or at least a bit trippy and fun: oddbird.net/2021/05/14/support-unknown/Permalink On twitter.com
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The important takeaway here for Container Queries is that we're adding a test, to provide fallbacks: @/supports not container(<query>) { … } But for backwards compatibility early on, you'll want to wrap that in extra parentheses: @/supports not (container(<query>)) { … }Permalink On twitter.com
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(This is not yet supported in the Chrome prototype, the CSSWG just resolved to add it this week. It will be supported by the time the feature goes live.)On twitter.com