<rch>
Relative to the root element's character width (ch). Like rem but for character width.
Quick example
.container { width: 30rch; /* root character width */ }<rch> Browser Support
Newly availableSince 202652% global usage
Since 2026 this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
Works in all modern browsers. May need a fallback for older browsers.
111+
147+
17.2+
111+