A Boolean value indicating whether or not the alt (Alternate) key is enabled when the touch event is created. If the alt key is enabled, the attribute's value is true. Otherwise, it is false.

This property is Read only .


var altEnabled = touchEvent.altKey;

Return value

true if the alt key is enabled for this event; and false if the alt is not enabled.


This example illustrates how to access the TouchEvent key modifier properties: TouchEvent.altKey, TouchEvent.ctrlKey, TouchEvent.metaKey and TouchEvent.shiftKey.

In following code snippet, the touchstart event handler logs the state of the event's modifier keys.

someElement.addEventListener('touchstart', function(e) {
   // Log the state of this event's modifier keys
   console.log("altKey = " + e.altKey);
   console.log("ctrlKey = " + e.ctrlKey);
   console.log("metaKey = " + e.metaKey);
   console.log("shiftKey = " + e.shiftKey);
}, false);


Specification Status Comment
Touch Events – Level 2 Draft Non-stable version.
Touch Events Recommendation Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
altKeyChrome Full support 22Edge Full support ≤18Firefox Full support 52
Full support 52
No support 18 — 24
IE No support NoOpera Full support YesSafari No support NoWebView Android Full support YesChrome Android Full support YesFirefox Android Full support 6Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes


Full support
Full support
No support
No support