Re: [csswg-drafts] [css-env] Add environment variables defined in WebKit (#11899)

The `fullscreen-inset-*` env vars are different from `safe-area-inset-*` in that they represent areas that contain UA-supplied UI in the fullscreen presentation, such as the close button, picture-in-picture button etc. They were intended for sites like YouTube to be able to place titles or captions avoiding this UA-supplied UI, while the video still covers the area underneath.

Having said that, we are not aware of any sites that have adopted these, so we are open to either renaming, or unshipping them.

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Received on Wednesday, 10 September 2025 17:57:43 UTC