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

Syntax

The <ratio> data type consists 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.

Examples

Use in a media query

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

Common aspect ratios

  Ratio Usage
Ratio4_3.png 4/3 Traditional TV format in the 20th century.
Ratio16_9.png 16/9 Modern "widescreen" TV format.
Ratio1_1.85.png 185/100 = 91/50
(non-integer dividends and divisors are not allowed)
The most common movie format since the 1960s.
Ratio1_2.39.png 239/100
(non-integer dividends and divisors are not allowed)
"Widescreen," anamorphic movie format.

Specifications

Specification Status Comment
Media Queries
The definition of '<ratio>' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 3.5IE Full support 9Opera Full support 9.5Safari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

See also

Document Tags and Contributors

Contributors to this page: fscholz, mfluehr, Sebastianz, teoli, kscarfone, velvel53, Sheppy, FredB
Last updated by: fscholz,