Intent to Ship: CSS cap and rcap font units

Daniil Sakhapov

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Aug 4, 2023, 6:41:41 AM8/4/23

to blink-dev

Contact emails

Explainer

Two font units related to the cap-height of the font. They are the last two to fully cover CSS Values font related units.

Specification

https://www.w3.org/TR/css-values-4/#cap

Summary

'cap' is equal to the used cap-height of the first available font. 'rcap' is equal to the value of the cap unit on the root element.

Blink component

Blink>CSS

TAG review

None

TAG review status

Not applicable

Risks

Interoperability and Compatibility

None

Gecko: Shipped/Shipping

WebKit: Positive (https://github.com/WebKit/standards-positions/issues/112)

Web developers: Asked offline at the conference.

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

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

Yes

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

Yes

https://wpt.fyi/css/css-values/cap-invalidation.html
https://wpt.fyi/css/css-contain/container-queries/font-relative-units-dynamic.html
https://wpt.fyi/css/css-values/cap-unit-001.html

Flag name on chrome://flags

CSSCapFontUnits

Requires code in //chrome?

False

Estimated milestones

Shipping on desktop	117
DevTrial on desktop	116

Shipping on Android	117
DevTrial on Android	116

Shipping on WebView

117

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/5137204166262784

This intent message was generated by Chrome Platform Status.

Mike Taylor

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Aug 4, 2023, 10:38:18 AM8/4/23

to Daniil Sakhapov, blink-dev

LGTM1

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Daniel Bratell

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Aug 9, 2023, 10:30:40 AM8/9/23

to Mike Taylor, Daniil Sakhapov, blink-dev

LGTM2

/Daniel

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TAMURA, Kent

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Aug 10, 2023, 1:08:33 PM8/10/23

to Daniil Sakhapov, blink-dev

LGTM3.

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/ec37c192-6afe-d123-9aaa-fd7faf2acf61%40gmail.com.