Can you explain how `dynamic-range-limit: constrained-high` works with
the dynamic-range media feature? Would it match standard or high (my
understanding it that it's somewhere in between).
On 12/9/24 6:25 PM, ccameron chromium wrote:
Post-weekend ping of this CSS property.
On Wed, Dec 4, 2024 at 1:40 PM ccameron chromium
<ccame...@chromium.org> wrote:
Contact emails
ccame...@chromium.org, sbouko...@google.com
Explainer
https://github.com/ccameron-chromium/hdr-headroom-limit/blob/main/EXPLAINER.md
Specification
https://drafts.csswg.org/css-color-hdr/#the-dynamic-range-limit-property
Summary
Enables a page to limit the maximum brightness of HDR content.
Blink component
Blink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
None
/Gecko/: No signal
(https://github.com/mozilla/standards-positions/issues/979)
/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/312) WebKit
engineers have expressed positive views of this proposal (it is
similar to features available on macOS and iOS).
/Web developers/: Positive
(https://github.com/w3c/csswg-drafts/issues/9074) Adobe has
endorsed this proposal. Internal developers at Google have also
requested this proposal.
/Other signals/:
Ergonomics
None.
Activation
None.
Security
None.
WebView application risks
Does this intent deprecate or change behavior of existing APIs,
such that it has potentially high risk for Android WebView-based
applications?
N/A
Debuggability
None
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes. Extensive tests of CSS properties in wpt/css/css-color-hdr.
Full end-to-end testing requires observation on an HDR display.
There does not yet exist a way to test high dynamic range (or wide
color gamut) rendering:
https://github.com/web-platform-tests/wpt/issues/44320
Flag name on about://flags
Experimental web platform features
Finch feature name
CSSDynamicRangeLimit
Requires code in //chrome?
False
Tracking bug
https://crbug.com/1470298
Availability expectation
Feature available on Web Platform in browsers as they add HDR
image support (only Chromium supports HDR images so far).
Adoption expectation
Feature is requested by specific partners.
Non-OSS dependencies
Does the feature depend on any code or APIs outside the Chromium
open source repository and its open-source dependencies to function?
No.
Sample links
https://ccameron-chromium.github.io/hdr-headroom-limit/example.html
Estimated milestones
Shipping on desktop 133
Shipping on Android 133
Shipping on WebView 133
Anticipated spec changes
No anticipated future spec changes.
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5146250411769856?gate=5206008539906048
Links to previous Intent discussions
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGnfxj-m-wA4B%3Dy4eQ-MwyHFgs4abfm9JW5XcP6s_X2bpEtc8w%40mail.gmail.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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