DOMTokenList.supports()

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 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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
supports
Experimental
Chrome Full support 49Edge Full support 17Firefox Full support 49IE No support NoOpera Full support 36Safari Full support 10.1WebView Android Full support 49Chrome Android Full support 49Firefox Android Full support 49Opera Android Full support 36Safari iOS Full support 10.3Samsung 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.