Widely Available
Units
id: rlh
rlh unit
The
rlh CSS length unit is a font-relative length relative to the line height of root element.
Baseline Status:
Achieved Widely Available on May 21, 2026 (Cross-browser Newly Available since Nov 21, 2023).
Desktop Browser Engine Support
Google Chrome
111
Supported
Mozilla Firefox
120
Supported
Apple Safari
16.4
Supported
Microsoft Edge
111
Supported
Mobile Browser Engine Support
Chrome Android
111
Firefox Android
120
Safari iOS
16.4
Specifications and References
MDN Browser Compat Data Keys: