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Same with Edge/Brave, however they all support HDR videos on Youtube, so I'm not sure what's the reason.

Additionally, the site claims it works (worked?) on 2020 MBA M1.

I have 2020 MBA M1 and it works on its internal screen if I use Safari. External SDR monitor doesn't show it. Chrome/Firefox don't show it.

There seems to be a strange bug in Safari. If I change the tab from/to that page, the mouse cursor jumps to the bottom left corner of the screen.

There seems to be a bug specific to safari, that's why it doesn't "work" on anything else.

By that logic, WebUSB is a bug specific to Blink-based browsers, since it doesn't work on anything else?

I don't understand. WebUSB seems to be a feature/standard.

WebUSB is yet another attempt at turning a hypertext viewer into an operating system. Documents were never meant to be Turing-complete.

HTML is far from the first document format that's turing complete. See Postscript, PowerPoint (No macros needed), Excel (No macros needed), PDF (if you count the embedded JS), Word (If you use macros), etc.

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