Web/API/Window/blur event

The blur event fires when an element has lost focus.

The opposite of blur is focus.

Bubbles	No
Cancelable	No
Interface	`FocusEvent`
Event handler property	`onblur`
Sync / Async	Sync
Composed	Yes

Examples

Live example

This example changes the appearance of a document when it loses focus. It uses addEventListener() to monitor focus and blur events.

HTML

<p id="log">Click on this document to give it focus.</p>

CSS

.paused {
  background: #ddd;
  color: #555;
}

JavaScript

function pause() {
  document.body.classList.add('paused');
  log.textContent = 'FOCUS LOST!';
}

function play() {
  document.body.classList.remove('paused');
  log.textContent = 'This document has focus. Click outside the document to lose focus.';
}

const log = document.getElementById('log');

window.addEventListener('blur', pause);
window.addEventListener('focus', play);

Result

Specifications

Specification	Status	Comment
UI Events	Working Draft	Added info that this event is composed.
Document Object Model (DOM) Level 3 Events Specification	Obsolete	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`blur` event	Chrome Full support 5	Edge Full support 12	Firefox Full support Yes Full support Yes No support ? — 24 Notes' Notes' The interface for this event is `Event`, not `FocusEvent`.	IE Full support Yes	Opera Full support 12.1	Safari Full support 5.1	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support Yes	Opera Android Full support 12.1	Safari iOS Full support 5.1	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
See implementation notes.': See implementation notes.

The value of Document.activeElement varies across browsers while this event is being handled (bug 452307): IE10 sets it to the element that the focus will move to, while Firefox and Chrome often set it to the body of the document.