web-feature: rlh unit

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The rlh CSS length unit is a font-relative length relative to the line height of root element.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-07

Servo

Android

2026-07

ArkWeb

HarmonyOS

*

Chrome Browser

Android

111

Safari Browser

iOS

16.4