web-feature: Custom media queries

The @custom-media CSS at-rule names a media query, which you can reuse in multiple @media rules.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-10

Servo

Android

2026-10

ArkWeb

HarmonyOS

*

Chrome Browser

Android

*

Safari Browser

iOS

*