<rex>
Relative to the root element's x-height. Like rem but for x-height.
Quick example
.text { font-size: 1.5rex; /* relative to root x-height */ }<rex> Browser Support
Newly available Since 2024 52% global usage
Since 2024 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.