DOMTokenList.supports()

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

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

JavaScript

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var boolean = element.supports(token)

Parameters

token: A DOMString containing the token to query for.

Returns

A Boolean indicating whether the token was found.

Example

JavaScript

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var 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 is well-supported, and just an example!
}

Specifications

Specification	Status	Comment
Credential Management Level 1	Editor's Draft	Initial definition.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	50.0	49 (49)	No support	?	?

Feature	Android	Android Webview	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile	Chrome for Android
Basic support	No support	50.0	49.0 (49)	No support	No support	No support	50.0

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/domtokenlist/supports

API DOM Method Reference