This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The ambient light events are a handy way to make a web page or an application aware of any change in the light intensity. It allows them to react to such a change, for example by changing the color contrast of the User Interface (UI) or by changing the exposure necessary to take a picture.

Light Events

When the light sensor of a device detects a change in the light level, it notifies the browser of that change. When the browser gets such a notification, it fires a DeviceLightEvent event that provides information about the exact light intensity (in lux units).

This event can be captured at the window object level by using the addEventListener method (using the devicelight event name) or by attaching an event handler to the window.ondevicelight property.

Once captured, the event object gives access to the light intensity expressed in lux through the DeviceLightEvent.value property.

Example

if ('ondevicelight' in window) {
  window.addEventListener('devicelight', function(event) {
    var body = document.querySelector('body');
    if (event.value < 50) {
      body.classList.add('darklight');
      body.classList.remove('brightlight');
    } else {
      body.classList.add('brightlight');
      body.classList.remove('darklight');
    }
  });
} else {
  console.log('devicelight event not supported');
}

Specifications

Specification Status Comment
Ambient Light Sensor
The definition of 'Ambient Light Events' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
ExperimentalNon-standard
Chrome No support NoEdge Full support YesFirefox Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 22 — 61
Notes
Notes Not supported for MacBook with Touch Bar and Windows 7 (see bug 754199).
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 15 — 61
Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?
value
ExperimentalNon-standard
Chrome No support NoEdge Full support YesFirefox Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 22 — 61
Notes
Notes Not supported for MacBook with Touch Bar and Windows 7 (see bug 754199).
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 15 — 61
Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

Document Tags and Contributors

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Last updated by: rzr,