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Curious - how well does this support the 'long-tail' features? What I mean by that are stuff that relatively few websites use, but requires a large amount of code to support? Things like WebCodecs, WebRTC, WebUSB etc.

Does this have a CanIUse equivalent?

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It's fairly easy to compile and give it a spin to try stuff out. It'll log to terminal everything it does/doesn't do, including things it does not support. You can also then go to https://html5test.co/ to see a bunch of stuff with relative ease.

Can extensions to be used for implementing those (and other) features? I think that they should be implemented as extensions, that they can then be replaced with other implementations (or disabled entirely).

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