Web/API/DOMTokenList/supports

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

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

let trueOrFalse = element.supports(token)

Parameters

token

A DOMString containing the token to query for.

Returns

A Boolean indicating whether the token was found.

Example

let 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	Status	Comment
Credential Management Level 1	Working Draft	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
supports Experimental'	Chrome Full support 49	Edge Full support 17	Firefox Full support 49	IE No support No	Opera Full support 36	Safari Full support 10.1	WebView Android Full support 49	Chrome Android Full support 49	Firefox Android Full support 49	Opera Android Full support 36	Safari iOS Full support 10.3	Samsung Internet Android Full support 5.0

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

DOMTokenList.supports() by Mozilla Contributors is licensed under CC-BY-SA 2.5.