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HTML | onblur Attribute

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This attribute fires at that moment when the element loses focus. This attribute is mostly used in Form validation code. This attribute is the opposite of onfocus attribute.
Supported Tags: It supports all HTML elements except these elements which are given below : 

  • <base>
  •  <bdo>
  •  <br>
  •  <head>
  •  <html>
  •  <iframe>
  •  <meta>
  •  <param>
  •  <script>
  •  <style>
  •  <title>


<element onblur = "script">

Attribute Value: This attribute is used to any HTML elements. The script run when onblur attribute called.


<!DOCTYPE html>
        <title>onblur attribute</title>
            body {
            h1 {
        <h2>onblur attribute</h2>
        <!-- When leave the input box then the input box
        value is converted into capital letter. -->
        Username: <input type="text" name="fname" id="GFG"
        function Geeks() {
            var y = document.getElementById("GFG");
            y.value = y.value.toUpperCase();

Before clicking outside: 

After clicking outside: 

Supported Browsers: The browser supported by onblur attribute are listed below: 

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 9
  • Firefox 24
  • Opera 11.6
  • Safari 3.1


Last Updated : 16 Aug, 2022
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