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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.

Applicable:

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<script>

Example:




<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML defer Attribute
    </title>
</head>
  
<body style="text-align:center;">
    <h1 style="color:green"
        GeeksForGeeks 
    </h1>
  
    <h2
        HTML 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




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

Output:
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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