Contact emails: se...@chromium.org, futh...@chromium.org
Explainer: None

Specification: https://drafts.csswg.org/css-nesting

Summary: Add the ability to nest CSS style rules inside other style rules,
combining selectors from the outer with the inner rule for increasing
modularity and maintainability of style sheets.

Blink component: Blink>CSS

TAG review: https://github.com/w3ctag/design-reviews/issues/791

TAG review status: Pending

Risks: There is a threat of a formal objection in CSSWG.

Interoperability and Compatibility:

Gecko: Positive (https://github.com/mozilla/standards-positions/issues/695)
WebKit: Positive (https://github.com/WebKit/standards-positions/issues/69)

Debuggability
Nesting style rules will be a big change for editing and displaying style rules 
in the inspector:

- Showing displaying nested rules for matching declarations
- Editing selectors
- Inserting nested rules
- etc...

Tracking issue for devtools support: https://crbug.com/1172985
Devtools says they're on track for shipping in M111.

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

Flag name: CSSNesting

Requires code in //chrome? False

Tracking bug: https://crbug.com/1095675

Estimated milestones
DevTrial on desktop     109
DevTrial on Android     109
Shipping                112


Anticipated spec changes: See above.

Link to entry on the Chrome Platform Status:
https://chromestatus.com/feature/5800613594529792

Links to previous Intent discussions:
Intent to prototype: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/YzrEmc%2BqlqPv72Au%40google.com

-- 
Software Engineer, Google Norway

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