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Expose CSSFontFeaturesValueRule

Category

CSS

Type

No developer-visible change

Status

In development (Chrome In development)

Intent stage

None

Summary

We were accidentally missing the [Exposed=Window] on the CSSFontFeaturesValueRule interface, so window.CSSFontFeaturesValueRule is incorrectly undefined even though the API was otherwise exposed. This interface has no constructor and it's unlikely that any website would be looking for it specifically, but it's technically an interop & spec-conformance bug, and maybe in theory slightly useful for feature detection.

Standards & signals

• Specification: https://drafts.csswg.org/css-fonts/#cssfontfeaturevaluesrule
• Firefox: Shipped/Shipping
• Safari: Shipped/Shipping
• Web developers: No signals — Just one bug filed by a web dev, but likely is out of principle rather than need.
• Tracking bug: https://issues.chromium.org/issues/385925149

Docs: https://developer.mozilla.org/en-US/docs/Web/API/CSSFontFeatureValuesRule

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