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HTML <script> defer Attribute

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The HTML defer attribute is a Boolean attribute that is used to specify that script is executed when the page has finished parsing. This attribute only works with external scripts. 

Syntax:

<script defer> 

Example: 

HTML

<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML <script> defer Attribute
    </title>
</head>
  
<body style="text-align:center;">
    <h1 style="color:green"
        GeeksForGeeks 
    </h1>
  
    <h2
        HTML <script> defer Attribute
    </h2>
  
    <script id="myGeeks"
            type="text/javascript"
            src="my_script.js"
            defer>
    </script>
    <br>
    <button type="button"
            onclick="myFunction()">
      Submit
  </button>
  
</body>
  
</html>

                    

External script: my_script.js 

javascript

function myFunction() {
    alert("Script works");
}

                    

Output: Before Click: 

After Click:


Supported Browsers: The browsers supported by <script> defer Attribute are listed below:

  • Google Chrome
  • Edge 12 and above
  • Internet Explorer 10 and above
  • Firefox 3.5 and above
  • Apple Safari
  • Opera


Last Updated : 27 Feb, 2024
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