DOMTokenList: supports() method
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
js
supports(token)
Parameters
token-
A string containing the token to query for.
Return value
A boolean value indicating whether the token was found.
Example
js
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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