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I don't know, maybe because it needs a browser extension which older ones don't support at the moment. I would assume they'll support them later, but honestly, I don't know.

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So this only works with browser? Can other apps stream to it as well?

It's not limited to browsers, here is the sdk: https://developers.google.com/cast/

AFAICT you push your application to the key, Android/iOS/Chrome can be used to interact with it.

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