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.


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 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;


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

Browser compatibilityUpdate compatibility data on GitHub

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

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.