This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The light-level CSS media feature can be used to test the ambient light level.


The device is used in a dim environment, where excessive contrast and brightness would be distracting or uncomfortable to the reader. For example: night time, or a dimly illuminated indoor environment.
The device is used in a environment with a light level in the ideal range for the screen, and which does not necessitate any particular adjustment.
The device is used in an exceptionally bright environment, causing the screen to be washed out and difficult to read. For example: bright daylight.


This code will likely not work on any devices (device compatablility is low).

@media (light-level: normal) {
  p {
    background: url("texture.jpg");
    color: #333;

@media (light-level: dim) {
  p {
    background: #222;
    color: #ccc;

@media (light-level: washed) {
  p {
    background: white;
    color: black;
    font-size: 2em;


Specification Status Comment
Media Queries Level 4
The definition of 'light-level' in that specification.
Candidate Recommendation Deferred to Media Queries Level 5.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No ? No No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No ? No No No ?

Document Tags and Contributors

Contributors to this page: connorshea, mfluehr, carlosvigil, CKH4, Sebastianz, kscarfone, cvrebert
Last updated by: connorshea,