web-feature: Promise (initial support)

Widely available

A promise represents an asynchronous operation which eventually succeeds or fails.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-09

Servo

Android

2026-09

ArkWeb

HarmonyOS

*

Chrome Browser

Android

32

Safari Browser

iOS

8