Unprefixed ruby-position CSS property

The 'ruby-position' CSS property controls the position of ruby annotation. It's the unprefixed version of the '-webkit-ruby-position' property. This property has three possible keywords: 'over', 'under', and 'inter-character'. For now, only the first two are being implemented. This change creates feature parity with Firefox.

Firefox supports no '-webkit-ruby-position', but 'ruby-position'. Shipping 'ruby-position' improves browser interoperability and websites don't need to rely on the vendor-prefixed '-webkit-ruby-position'.



Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 84
  • Chrome for Android release 84
  • Android WebView release 84

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped
  • No public signals
  • No public signals
  • Positive


Last updated on 2020-06-14