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HTML | defer Attribute

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  • Last Updated : 24 Aug, 2022
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The HTML defer attribute is a boolean attribute which is used to specify that script is executed when the page has finished parsing. This attribute only works with external scripts. 





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

External script: my_script.js 


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


Before Click:


After Click:


Supported Browsers: The browsers supported by HTML defer Attribute are listed below:

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

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