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It's an HDR video and it's the OS that controls how it looks. If your display is HDR (OLED and Mini LED Apple displays) it will brighten just the video pixels. If your display is not HDR, it will do as you describe (across the whole OS, not just the webpage). Apple calls this EDR I believe.

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Yeah I think you're right. I thought that my iPad had an HDR display (it's got a wide gamut coverage and can show HDR content) but apparently it's not "Apple HDR".

Though - lots of non-OLED/miniLED displays have HDR... why does Apple have a different standard?

I believe they do it this way because they want to be able to display HDR and SDR content on the same display at the same time.

Because their non-hdr displays don't have enough peak brightness for good looking HDR.

That's.... terrible way to handle it. Make whole screen look worse

Are you on a MBP? It doesn’t actually make anything worse, it raises the screen brightness at the same time as it dims the content, so it stays at the same absolute brightness and the transition is imperceptible.

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