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HTML DOM | KeyboardEvent altKey Property

Last Updated : 06 Jul, 2022
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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. 

Syntax:

event.altKey

Below program illustrates the KeyboardEvent altkey property in HTML: 

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

html 
<!DOCTYPE html>
<html>
    
<head> 
    <title>
        HTML DOM KeyboardEvent altKey property
    </title>
</head>

<body>

    <h1>GeeksforGeeks</h1> 
    
    <h2>KeyboardEvent altKey Property</h2>
    
    <p>
        Check whether the alt key is pressed or not
    </p> 
    
    <input type="text" onkeydown="keyboard(event)">
    
    <p id = "test"></p>
    
    <!-- script to check alt key event -->
    <script>
        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!";
            }
        }
    </script>
</body>

</html>

Output: 

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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HTML | DOM Form target Property

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Shubrodeep Banerjee
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