aspect-ratio

The aspect-ratio CSS property sets a preferred aspect ratio for the box, which will be used in the calculation of auto sizes and some other layout functions.

Try it

Syntax

aspect-ratio: 1 / 1;
aspect-ratio: 1;

/* Global values */
aspect-ratio: inherit;
aspect-ratio: initial;
aspect-ratio: revert;
aspect-ratio: revert-layer;
aspect-ratio: unset;

Values

auto

Replaced elements with an intrinsic aspect ratio use that aspect ratio, otherwise the box has no preferred aspect ratio. Size calculations involving intrinsic aspect ratio always work with the content box dimensions.

<ratio>

The box's preferred aspect ratio is the specified ratio of width / height. If height and the preceding slash character are omitted, height defaults to 1. Size calculations involving preferred aspect ratio work with the dimensions of the box specified by box-sizing.

Formal definition

Initial valueauto
Applies toall elements except inline boxes and internal ruby or table boxes
Inheritedno
Computed valueas specified
Animation typediscrete

Formal syntax

aspect-ratio = 
  auto     ||
  <ratio>  

<ratio> = 
  <number [0,∞]> [ / <number [0,∞]> ]?

Examples

Examples of values for aspect-ratio

aspect-ratio: 1 / 1;
aspect-ratio: 16 / 9;
aspect-ratio: 0.5;

Specifications

Specification
CSS Box Sizing Module Level 4
# aspect-ratio

Browser compatibility

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See also