rcap unit

The rcap CSS length unit is a font-relative length equal to the value of the cap unit on the root element. Cap-height is approximately equal to the height of a capital Latin letter.

Baseline Status: Achieved Newly Available on Jan 13, 2026 across core engines.

Desktop Browser Engine Support

Google Chrome

118

Supported

Mozilla Firefox

147

Supported

Apple Safari

17.2

Supported

Microsoft Edge

118

Supported

Mobile Browser Engine Support

Chrome Android

118

Firefox Android

147

Safari iOS

17.2

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

css.types.length.rcap ↗