[zimpenfish]

> If the smiley face on the right is not much much brighter than the page background [...] then your hardware does not support this

Or you're using Safari because my hardware absolutely does support this (tested in Chrome and I am thankful that Safari does not support it because good grief.)

[astrange]

A funny thing I've noticed in Safari is that the play buttons on video elements are HDR white, and so the screen will adapt (turn grey) when you scroll past one.

[kllrnohj]

> and I am thankful that Safari does not support it because good grief

Safari absolutely will support HDR images if it doesn't already. It might not support this PNG hack, but it's inevitable that it'll support HDR HEVC or JPEG images since those are what's produced by iOS and Android cameras respectively, and they obviously aren't going to just ignore them.

[re]

iPhones have supported HDR photos for over a decade, since at least the iPhone 5S; for whatever reason, they've ignored them for at least that long.

[kllrnohj]

I think you're confusing which HDR is being used. HDR photography, the multi-expose combinations, was probably iPhone 5S but that still results in an SDR image. That's a completely different thing entirely.

iPhones have not captured HDR images until much, much more recently. No earlier than iPhone 12 at the soonest (when they first could capture HDR video), although they keep fiddling with which format they use for the result. iOS 17 was when they added support for displaying these images in UIKit & Swift, which was only like 2 years ago give or take. WWDC '23 was similarly when they started talking about handling HDR images. And they just recently announced they'll be adopting ISO 21496-1 at WWDC 2024. ISO 21496-1 being the gainmap style approach that Google & Adobe adopted with UltraHDR in 2023.

[re]

Thanks for the clarification.