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HTML | onblur Attribute

  • Difficulty Level : Basic
  • Last Updated : 19 Jul, 2019

This attribute fires at that moment when the element loses focus. This attribute is mostly used in Form validation code. This attribute is opposite of onfocus attribute.


<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
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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