DOMTokenList.supports()

Experimental: This is an experimental technology
Check 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 value 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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
supports
49
17
49
No
36
10.1
49
49
49
36
10.3
5.0

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https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/supports