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HTML DOM | KeyboardEvent altKey Property

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The KeyboardEvent altKey property in HTML DOM is a read-only property and used to return the boolean value which indicates the alt key is pressed or not. It returns True if alt key is pressed otherwise return false. 



Below program illustrates the KeyboardEvent altkey property in HTML: 

Example: This example check whether the “ALT” key is pressed or not. 


<!DOCTYPE html>
        HTML DOM KeyboardEvent altKey property
    <h2>KeyboardEvent altKey Property</h2>
        Check whether the alt key is pressed or not
    <input type="text" onkeydown="keyboard(event)">
    <p id = "test"></p>
    <!-- script to check alt key event -->
        function keyboard(event) {
            var a = document.getElementById("test");
            if (event.altKey) {
                a.innerHTML = "The ALT key has been pressed!";
            else {
                a.innerHTML = "The ALT key has not been pressed!";


Before Press the Key:


After Press the key:


Supported Browsers: The browser supported by KeyboardEvent altKey property are listed below:

  • Opera 12.1
  • Internet Explorer 9
  • Google Chrome 1
  • Edge 12
  • Firefox 1.5
  • Apple Safari 1.2

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Last Updated : 06 Jul, 2022
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