Re: [csswg-drafts] [css-color-hdr] auto value of dynamic-range-limit (#11558)

More thoughts to get down before the F2F:

I am negatively disposed to the idea of allowing the user agent to apply heuristics to adjust the HDR headroom of the page on an element-by-element basis (e.g, limiting HDR headroom for small `img` elements, but automatically increasing it for larger `img` elements that look like they're the "center of attention"). Such a specification would create unpredictable behavior and incompatibility between browsers.

Any user agent imposed HDR headroom limits must be applied to the page as a whole. These limits could be imposed because:
* power savings are desired
* system-wide display settings change
* the page is backgrounded (e.g, [this video](https://photos.app.goo.gl/SBBYcWMvHXRjUomG9) shows what Preview does, which is 
* other user agent specific heuristics

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Received on Thursday, 30 January 2025 11:21:40 UTC