Contact emailssakha...@chromium.org

ExplainerNested pseudo elements styling allows to style ::before::marker
and ::after::marker pseudo elements and will be essential to style
::column::scroll-marker pseudo elements for the carousel project (
https://github.com/flackr/carousel/tree/main/fragmentation).

Specificationhttps://www.w3.org/TR/css-pseudo-4/#marker-pseudo

Summary

Allows to style pseudo elements that are nested inside other pseudo
elements. So far, support is defined for: ::before::marker ::after::marker
With ::column::scroll-marker being supported in the future.

Blink componentBlink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>

TAG reviewNone

TAG review statusNot applicable

Risks

Interoperability and Compatibility

None

*Gecko*: No signal (
https://github.com/mozilla/standards-positions/issues/1109)

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/425)

*Web developers*: No signals

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/css/css-pseudo/marker-font-variant-numeric-normal.html
::column::scroll-marker tests are in wpt_internal for now


Flag name on about://flagsCSSNestedPseudoElements

Requires code in //chrome?False

Tracking bughttps://issues.chromium.org/issues/373478544

Estimated milestones
DevTrial on desktop 131
DevTrial on Android 131

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/5199947786616832?gate=5142809487867904

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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