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Those who noticed this, did you update Safari or OS between last seeing HDR and noticing it was gone in Safari?
 
Not playing in HDR or the little resolution icon is wrong?
I am seeing HDR footage but the icon isn't correct.
 
System Preferences; Battery; Battery

Make sure ‘Optimize Video Streaming While On Battery’ is not ticked.

Forget it. It’s not working either. YouTube disabled it for some reason.
 
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You are misunderstanding me. I am not having any problems seeing HDR. I think YT has a problem with their icon.
That's why I asked. I'm not seeing any HDR in the video you linked to, which at the point you suggest has very vibrant color in SDR but isn't over 500nits. (I prefer the fireworks later in that video as a test, obviously brighter than the SDR part of my screen even at low brightness.)
 
Change user agent in developer settings and see if YouTube has changed something on their end?
 
Change user agent in developer settings and see if YouTube has changed something on their end?
Not seeing HDR in Chrome either, so I wonder if it's Youtube, but could still be Apple. I updated yesterday, but didn't notice anything that should affect this.
 
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