Web platform features explorer

rlh unit

The rlh CSS length unit is a font-relative length relative to the line height of root element.

Status

Baseline Newly Available (since 2023-11-21)

This feature is expected to reach Baseline Widely Available status on: 2026-05-21

MDN documentation

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 120 Released on 2023-11-21
  • Firefox for Android 120 Released on 2023-11-21
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

Usage (according to Chrome Platform Status)

~0.001% of page loads. More data at chromestatus.