Intent to Ship: Sideways writing modes

[TAMURA, Kent]

Contact emails

tk...@chromium.org

Explainer

None.

I think an MDN page is enough.

https://developer.mozilla.org/en-US/docs/Web/CSS/writing-mode#sideways-rl

https://developer.mozilla.org/en-US/docs/Web/CSS/writing-mode#sideways-lr

Specification

https://drafts.csswg.org/css-writing-modes/#propdef-writing-mode

Summary

Support of `sideways-rl` and `sideways-lr` keywords for `writing-mode` CSS property is added. They are vertical writing modes, and all letters are sideways.

Blink component

Blink>Layout>WritingMode

Search tags

writing-mode, sideways

TAG review

None.  Firefox already shipped this.

TAG review status

Not applicable

Risks

Interoperability and Compatibility

Risks are very low. The other two engines already support or develop this feature.

Gecko: Shipped/Shipping

WebKit: In development Behind a flag

Web developers: Strongly positive (https://issues.chromium.org/issues/40501131) The issue has 23 votes.

Other signals:

WebView application risks

Very low.

This feature is an addition of new keywords to `writing-mode` property, and won't change any existing behavior.

Debuggability

Existing DevTools features should be enough.

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?

Yes

https://wpt.fyi/results/css/css-writing-modes

Flag name on chrome://flags

None

Finch feature name

SidewaysWritingModes

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/40501131

Non-OSS dependencies

None.

Estimated milestones

Shipping on desktop	132
DevTrial on desktop	129
Shipping on Android	132
DevTrial on Android	129
Shipping on WebView	132

Anticipated spec changes

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/6201053052928000?gate=5108414983438336

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGH7WqFO1%3DUt7OpUvfgnyD5Gaoy7j8zFhSQRw08MDw34SfOL3g%40mail.gmail.com

This intent message was generated by Chrome Platform Status.

--

TAMURA Kent
Software Engineer, Google

[Alex Russell]

LGTM1

[Yoav Weiss (@Shopify)]

LGTM2

[Vladimir Levin]

LGTM3

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