Web platform features explorer - rex unit

Web platform features explorer

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

Rex, in <length>

Specifications

CSS Values and Units Module Level 4 (#font-relative-lengths), from Cascading Style Sheets (CSS) Working Group (W3C).

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 (19 months)

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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