web-feature: XMLHttpRequest

Widely available

The XMLHttpRequest API makes HTTP requests. It’s the predecessor to fetch(). Also known as XHR.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-10

Servo

Android

2026-10

ArkWeb

HarmonyOS

*

Chrome Browser

Android

18

Safari Browser

iOS

1