Contact emailsccame...@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 componentBlink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>

TAG reviewNone

TAG review statusNot 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://flagsExperimental web platform features

Finch feature nameCSSDynamicRangeLimit

Requires code in //chrome?False

Tracking bughttps://crbug.com/1470298

Availability expectationFeature available on Web Platform in browsers as
they add HDR image support (only Chromium supports HDR images so far).

Adoption expectationFeature 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 changesNo anticipated future spec changes.

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5146250411769856?gate=5206008539906048

Links to previous Intent discussionsIntent 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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