This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The contains() method returns a boolean indicating whether the given string is in the list.
contains(string)
stringA string you want to check for the existence of in the list.
A boolean indicating whether the given string is in the list.
TypeErrorThrown if no argument is provided.
| Specification |
|---|
| HTML> # dom-domstringlist-contains> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
contains |
1 | 12 | 1.5 | ≤12.1 | 5.1 | 18 | 4 | ≤12.1 | 5 | 1.0 | 3 | 5 |
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https://developer.mozilla.org/en-US/docs/Web/API/DOMStringList/contains