Contact emailstk...@chromium.org

ExplainerNone.
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 componentBlink>Layout>WritingMode
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ELayout%3EWritingMode>

Search tagswriting-mode
<https://chromestatus.com/features#tags:writing-mode>, sideways
<https://chromestatus.com/features#tags:sideways>

TAG reviewNone.  Firefox already shipped this.

TAG review statusNot 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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

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


Flag name on chrome://flagsNone

Finch feature nameSidewaysWritingModes

Requires code in //chrome?False

Tracking bughttps://issues.chromium.org/issues/40501131

Non-OSS dependenciesNone.

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 discussionsIntent 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
<https://chromestatus.com/>.

-- 
TAMURA Kent
Software Engineer, Google

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