Web/CSS/flex value

The <flex> CSS data type denotes a flexible length within a grid container. It is used in grid-template-columns, grid-template-rows and other related properties.

Syntax

The <flex> data type is specified as a <number> followed by the unit fr. The fr unit represents a fraction of the leftover space in the grid container. As with all CSS dimensions, there is no space between the unit and the number.

Examples

Examples of correct values for the fr data type

1fr    /* Using an integer value */
2.5fr  /* Using a float value */

Example of use in a tracklisting for CSS Grid layout

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr 2.5fr 1.5fr;
}

Specifications

Specification	Status	Comment
CSS Grid LayoutThe definition of '<flex>' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
<flex>	Chrome Full support 29	Edge Full support 12	Firefox Full support 40	IE Full support 10	Opera Full support 28	Safari Full support 10.1	WebView Android Full support 57	Chrome Android Full support 29	Firefox Android Full support 40	Opera Android Full support 28	Safari iOS Full support 10.3	Samsung Internet Android Full support 2.0

Legend

Full support  

Full support

See also

• CSS Grid Layout

<flex> by Mozilla Contributors is licensed under CC-BY-SA 2.5.