Intent to Ship: Implement CSS property font-language-override

[Chromestatus]

Contact emails

sejal...@microsoft.com

Explainer

None

Specification

https://www.w3.org/TR/css-fonts-4/#font-language-override-prop

Summary

This feature introduces support for the font-language-override CSS property in Chromium. The property allows developers to override the system language used for OpenType glyph substitution by specifying a four-character language tag directly in CSS. This enables fine-grained typographic control, particularly useful for multilingual content or fonts with language-specific glyph variants.

Blink component

Blink>Fonts

Web Feature ID

font-language-override

TAG review

None

TAG review status

Not applicable

Risks

Interoperability and Compatibility

None

Gecko: Shipped/Shipping (https://bugzilla.mozilla.org/show_bug.cgi?id=1347821)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/556)

Web developers: Positive 13 users have indicated that they are affected by this issue and its related duplicates, as noted in https://issues.chromium.org/issues/40891154 and https://issues.chromium.org/issues/41170551

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? None

Debuggability

Existing DevTools capabilities already cover this.

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?

Yeshttps://wpt.fyi/results/css/css-fonts/font-language-override-01.html?label=experimental&label=master&aligned https://wpt.fyi/results/css/css-fonts/font-language-override-02.html?label=experimental&label=master&aligned https://wpt.fyi/results/css/css-fonts/font-language-override-03.html?label=experimental&label=master&aligned https://wpt.fyi/results/css/css-fonts/parsing/font-language-override-computed.html?label=experimental&label=master&aligned https://wpt.fyi/results/css/css-fonts/parsing/font-language-override-invalid.html?label=experimental&label=master&aligned https://wpt.fyi/results/css/css-fonts/parsing/font-language-override-valid.html?label=experimental&label=master&aligned

Flag name on about://flags

Finch feature name

FontLanguageOverride

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/41170551

Estimated milestones

Shipping on desktop	142
Shipping on Android	142
Shipping on WebView	142
Shipping on iOS	142

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way). None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5149766073843712?gate=4807908353245184

This intent message was generated by Chrome Platform Status.

[Alex Russell]

LGTM1

[Dan Clark]

LGTM2

[Mike Taylor]

LGTM3

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