HTML onblur Event Attribute HTML Reference

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Example Validate an input field when the user leaves it: <input type="text" name="fname" id="fname" onblur="upperCase()">

Browser Support

1. Definition and Usage

The onblur attribute fires the moment that the element loses focus.

Onblur is most often used with form validation code (e.g. when the user leaves a form field).

Tip: The onblur attribute is the opposite of the onfocus attribute.

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2. Differences Between HTML 4.01 and HTML5

None.

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3. Syntax

<element onblur="script">

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4. Attribute Values

Value	Description
script	The script to be run on onblur