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
supports(token);
Parameters
token
-
A string containing the token to query for.
Returns
A boolean value indicating whether the token was found.
Example
const 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 |
---|
DOM Standard # ref-for-dom-domtokenlist-supports① |
Browser compatibility
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