The width CSS media feature can be used to test the width of the viewport (or the page box, for paged media).


The width feature is specified as a <length> value representing the viewport width. It is a range feature, meaning that you can also use the prefixed min-width and max-width variants to query minimum and maximum values, respectively.



<div>Watch this element as you resize your viewport's width.</div>


/* Exact width */
@media (width: 360px) {
  div {
    color: red;

/* Minimum width */
@media (min-width: 35rem) {
  div {
    background: yellow;

/* Maximum width */
@media (max-width: 50rem) {
  div {
    border: 2px solid blue;



Specification Status Comment
Media Queries Level 4
The definition of 'width' in that specification.
Candidate Recommendation The value can now be negative, in which case it computes to false.
Media Queries
The definition of 'width' in that specification.
Recommendation Initial definition. The value must be nonnegative.

Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
width media feature 1 12 2 9 10 3
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
width media feature ≤37 18 4 10.1 1 1.0

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.