The aspect-ratio CSS media feature can be used to test the aspect ratio of the viewport.


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


The example below is contained in an <iframe>, which creates its own viewport. Resize the <iframe> to see aspect-ratio in action.

Note that, when none of the media query conditions are true, the background will turn white because none of the below rules will be applied to the <div> inside the <iframe>. See if you can find which width and height values trigger this!


<div id="inner">
  Watch this element as you resize your viewport's width and height.


/* Minimum aspect ratio */
@media (min-aspect-ratio: 8/5) {
  div {
    background: #9af; /* blue */

/* Maximum aspect ratio */
@media (max-aspect-ratio: 3/2) {
  div {
    background: #9ff; /* cyan */

/* Exact aspect ratio, put it at the bottom to avoid override*/
@media (aspect-ratio: 1/1) {
  div {
    background: #f9a; /* red */



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
aspect-ratio 3 12 3.5 9 10 5 ≤37 18 4 10.1 4.2 1.0

See also

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