web-feature: rem

baseline logo Widely available

The rem CSS length unit is a font-relative length that is equal to the font size of the root HTML element which for most browsers is 16px.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-05

Servo

Android

2026-05

Chrome Browser

Android

18

Safari Browser

iOS

4

Notes

Support data provided by: BCD logo

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This feature was last updated on May 02, 2026.