Yes, the latter. At least Chromium-based browsers support it behind a flag (ie., you can't use it on the web yet, but you can experiment with it and file feedba

Yes, the latter. At least Chromium-based browsers support it behind a flag (ie., you can't use it on the web yet, but you can experiment with it and file feedback). I don't know if Firefox does, too, but they very well might.