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[selectors] Add :picture-in-picture pseudo-class · Issue #3796 · w3c/csswg-drafts · GitHub
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See https://wicg.github.io/picture-in-picture/#css-pseudo-class
The Picture-in-Picture WICG spec proposes adding a pseudo for the picture-in-picture element.
Blink has an intent-to-ship for this pseudo: https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/X-qPSmdSR_g/StUMNNiQAwAJ
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