<ratio>

The <ratio> CSS data type, used for describing aspect ratios in media queries, denotes the proportion between two unitless values.

Syntax

In Media Queries Level 3, the <ratio> data type consisted of a strictly positive <integer> followed by a forward slash ('/', Unicode U+002F SOLIDUS) and a second strictly positive <integer>. Spaces before and after the slash are optional. The first number represents the width, while the second represents the height.

In Media Queries Level 4, the <ratio> date type is updated to consist of a strictly positive <number> followed by a forward slash ('/', Unicode U+002F SOLIDUS) and a second strictly positive <number>. In addition a single <number> as a value is allowable.

Examples

Use in a media query

@media screen and (min-aspect-ratio: 16/9) { ... }

Common aspect ratios

	Ratio	Usage
	4/3	Traditional TV format in the 20th century.
	16/9	Modern "widescreen" TV format.
	185/100 = 91/50	The most common movie format since the 1960s.
	239/100	"Widescreen," anamorphic movie format.

Specifications

Browser compatibility

See also

• aspect-ratio media feature