<ratio>
A CSS data type representing the proportion of one side to another (like 16 / 9 for widescreen). It's primarily used in the aspect-ratio property or media queries.
Quick example
.video-container {
/* Keeps the element at a consistent 16:9 widescreen shape */
aspect-ratio: 16 / 9;
}
@media (aspect-ratio: 1/1) {
/* Custom styles for square screens */
}<ratio> Browser Support
Widely available Since 2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
Safe to use without fallbacks.
3+
3.5+
5+
12+