Intent to Extend Experiment 2: Dark mode support for web apps

[Louise Brett]

Contact emails

loub...@google.com, gle...@chromium.org, mgi...@chromium.org

Explainer

https://github.com/WICG/manifest-incubations/blob/gh-pages/user-preferences-explainer.md

Specification

Summary

Add a field to the web app manifest which allows apps to specify a different theme color and background color for dark mode.

Blink component

Blink>AppManifest

TAG review

https://github.com/w3ctag/design-reviews/issues/696

TAG review status

Pending

Risks

Interoperability and Compatibility

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/630)

WebKit: No signal (https://lists.webkit.org/pipermail/webkit-dev/2022-April/032187.html)

Web developers: Positive (https://github.com/w3c/manifest/issues/975)

Other signals:

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?

Goals for experimentation

Allow web developers to use this field and provide feedback.

Reason this experiment is being extended

Requesting a one milestone extension to 108 (inclusive). The manifest format is going to change again based on https://github.com/w3c/manifest/issues/1045. We will do a new OT for the new format but would like the one milestone extension in order to get the new OT ready to start in 109.

Ongoing technical constraints

Debuggability

chrome://web-app-internals can be used for debugging, and this has been added to the DevTools Application pane.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

No

Not supported on Android

Is this feature fully tested by web-platform-tests?

Yes

Flag name

chrome://flags/#enable-experimental-web-platform-features

Requires code in //chrome?

True

Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1271804

Launch bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1279284

Estimated milestones

OriginTrial desktop last	107
OriginTrial desktop first	99

Requesting a one milestone extension to 108 (inclusive)

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5714780426862592

Links to previous Intent discussions

Intent to prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/Y6zNtG0f-6A
Intent to Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/ftoKq32Baz4
Intent to Extend Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/2c8msRrrcF0

This intent message was generated by Chrome Platform Status.

[Chris Harrelson]

LGTM

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