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HTML | <script> defer Attribute

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  • Last Updated : 02 Jun, 2022

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. 


<script defer> 



<!DOCTYPE html>
        HTML &lt;script&gt; defer Attribute
<body style="text-align:center;">
    <h1 style="color:green">
        HTML &lt;script&gt; defer Attribute
    <script id="myGeeks"
    <button type="button"

External script: my_script.js 


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

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