Web platform features explorer

rex unit

The rex CSS length unit is a font-relative length that is equal to the x-height of the root element.

Status

Limited availability

MDN documentation

Specifications

Browser support

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

Baseline availability blocked since December 2023 by Firefox (24 months)

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Developer signals

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