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'.



Specification link

Unknown standards status - check spec link for status

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

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

  • Shipped/Shipping
  • No signal
  • Positive


Search tags

css, ruby,

Last updated on 2021-12-13