DOMTokenList.supports

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

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

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

Browser compatibility