This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The has() method of the KeyboardLayoutMap interface returns a boolean indicating whether the object has an element with the specified key. A list of valid keys is found in the UI Events KeyboardEvent code Values spec.


var aBoolean = KeyboardLayoutMap.has(key)


The key of an element to search for in the map.

Return value

A Boolean indicating whether the specifed key was found.


Specification Status Comment
Keyboard Map
The definition of 'has()' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Chrome Full support 69Edge Full support 79Firefox No support NoIE No support NoOpera Full support 56Safari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android Full support 48Safari iOS No support NoSamsung Internet Android No support No


Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.