DOMTokenList: supports() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The supports() method of the DOMTokenList interface returns true if a given token is in the associated attribute's supported tokens. This method is intended to support feature detection.

Syntax

js
supports(token)

Parameters

token

A string containing the token to query for.

Return value

A boolean value indicating whether the token was found.

Example

js
const iframe = document.getElementById("display");

if (iframe.sandbox.supports("an-upcoming-feature")) {
  // support code for mystery future feature
} else {
  // fallback code
}

if (iframe.sandbox.supports("allow-scripts")) {
  // instruct frame to run JavaScript
  //
  // (NOTE: This feature is well-supported; this is just an example!)
  //
}

Specifications

Specification
DOM
# ref-for-dom-domtokenlist-supports①

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
supports

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support