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.
DOMTokenList.supports()
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
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
supports |
49
|
17
|
49
|
No
|
36
|
10.1
|
49
|
49
|
49
|
36
|
10.3
|
5.0
|
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https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/supports
