Intent to Prototype: CSS ruby-overhang property
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Minseong Kim
Sep 16, 2025, 11:29:44 AM (7 days ago) Sep 16
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Explainer
None
Specification
Summary
Support of new CSS property `ruby-overhang` is added. The property accepts one of `auto` and `none` keywords, and controls overhang of ruby annotation text.
Blink component
Motivation
A ruby annotation can sometimes obscure adjacent content when it overhangs. The ruby-overhang property gives authors a way to disable this behavior and prevent unwanted overlap.
Initial public proposal
None
Search tags
TAG review
None; Safari already shipped this.
TAG review status
Not applicable
Risks
Interoperability and Compatibility
None
Gecko: No signal
WebKit: Sipped/Shipping
Web developers: No signals
Other signals:
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
Debuggability
None
Is this feature fully tested by web-platform-tests?
Yes
"ruby-overhang*" files in https://wpt.fyi/results/css/css-ruby
Flag name on chrome://flags
None
Finch feature name
None
Non-finch justification
None
Requires code in //chrome?
False
Tracking bug
Estimated milestones
No milestones specified
Link to entry on the Chrome Platform Status
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