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
UI Events # event-type-blur

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`blur_event`	5	12	6 ["Apart from firing the event on `window` as other browsers do, Firefox also fires the event on the `document` object. See bug 1228802.", "Before Firefox 24, the interface for this event is a plain `Event`, not `FocusEvent`."]	11	≤12.1	5.1	≤37	18	6 ["Apart from firing the event on `window` as other browsers do, Firefox also fires the event on the `document` object. See bug 1228802.", "Before Firefox 24, the interface for this event is a plain `Event`, not `FocusEvent`."]	≤12.1	5	1.0

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.

Name	Web APIs
Version
Badge
Last Updated	2022-04-27T09:33:08Z