UserAgent Stylesheets for Extensions

Provide extensions with a way to inject styles into a page that take precedence over the page's styles. Do so by implementing user stylesheet level priority, which is lower than author specified rules, but higher for !important rules.



Editor's draft

Status in Chromium


Proposed (tracking bug)

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 2020-03-25