Re: [csswg-drafts] [css-env][css-conditional] Need an approach to check whether an environment variable is supported (#3576)

To summarize, the proposal is to extend `<supports-feature>` with a `<supports-env-fn>`, like so:

```
<supports-feature> = <supports-selector-fn> | <supports-env-fn> | <supports-decl>
<supports-selector-fn> = selector( <complex-selector> )
<supports-env-fn> = env( <custom-ident> )
```

When the passed in `<custom-ident>` is one of the supported Environment Variables, the result is `true`. Otherwise it is `false`.

Example usage:

```css
@supports env(safe-area-max-inset-bottom) { … }
```

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Received on Tuesday, 1 July 2025 08:13:24 UTC