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 compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 22 Yes 52
18 — 24
No Yes No
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes Yes ? 6 Yes Yes ?

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