HTML | DOM TouchEvent altKey Property

The TouchEvent altKey property is a read-only property and used for returning a Boolean value which indicates whether or not the “ALT” key was pressed when a touch event was triggered.
The TouchEvent altKey property mostly returns false because generally, touch devices do not have an alt key.

Syntax :


Return Value: It returns true if the alt key is pressed, else it returns false.

Below program illustrates the TouchEvent altKey property :

Example: Finding out whether the “ALT” key was pressed on the touch screen or not.





<!DOCTYPE html>
<meta name="viewport" 
    <title>TouchEvent altKey property in HTML</title>
        h1 {
            color: green;
        h2 {
            font-family: Impact;
        body {
            text-align: center;
<body ontouchstart="isKeyPressed(event)">
    <h2>TouchEvent altKey property</h2>
    <p>Touch somewhere in the document and wait for 
      an alert to tell if the ALT key was pressed or not.</p>
        function count(event) {
            //  Check whether the ALT key has been pressed
            //  or not.
            if (event.altKey) {
                alert("ALT key has been pressed!");
            } else {
                alert("ALT key has not been pressed!");



  • Before clicking the button:
  • After clicking the button:

Supported Browsers:

  • Internet Explorer
  • Google Chrome
  • Firefox


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