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HTML | defer Attribute

  • Last Updated : 20 Sep, 2019

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.


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<!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
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera

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