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La proprietà  CSS flex-grow specifica il fattore di ingrandimento dell'elemento flessibile. Essa specifica la quantità di spazio che l'elemento richiede all'interno del suo contenitore flessibile.

Initial value0
Applies toflex items, including in-flow pseudo-elements
Computed valueas specified
Animation typea number
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Guarda Using CSS flexible boxes per vedere altre proprietà e leggere ulteriori informazioni.


/* <number> values */
flex-grow: 3;
flex-grow: 0.6;

/* Global values */
flex-grow: inherit;
flex-grow: initial;
flex-grow: unset;


See <number>. Negative values are invalid.

Formal syntax




<h4>This is a Flex-Grow</h4>
<h5>A,B,C and F are flex-grow:1 . D and E are flex-grow:2 .</h5>
<div id="content">
  <div class="box" style="background-color:red;">A</div>
  <div class="box" style="background-color:lightblue;">B</div>
  <div class="box" style="background-color:yellow;">C</div>
  <div class="box1" style="background-color:brown;">D</div>
  <div class="box1" style="background-color:lightgreen;">E</div>
  <div class="box" style="background-color:brown;">F</div>


#content {
  -ms-box-orient: horizontal;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  display: flex;
  -webkit-justify-content: space-around;
  justify-content: space-around;
  -webkit-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-align-items: stretch;
  align-items: stretch;

.box {
  flex-grow: 1;
  border: 3px solid rgba(0,0,0,.2);

.box1 {
  flex-grow: 2;
  border: 3px solid rgba(0,0,0,.2);



Specification Status Comment
CSS Flexible Box Layout Module
The definition of 'flex-grow' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support 18.0 (18.0)[1] 21.0-webkit 11 12.10 6.1-webkit
< 0 animate 32.0 (32.0)[2] 49.0 ? No support No support
Feature Firefox Mobile (Gecko) Android IE Phone Opera Mobile Safari Mobile
Basic support 18.0 (18.0)[1] ? No support 12.10 No support
< 0 animate 32.0 (32.0)[2] ? ? No support No support

[1] Firefox supports only single-line flexbox until Firefox 27. To activate flexbox support, for Firefox 18 and 19, the user has to change the about:config preference layout.css.flexbox.enabled to true.

In addition to the unprefixed support, Gecko 48.0 (Firefox 48.0 / Thunderbird 48.0 / SeaMonkey 2.45) added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) the preference defaults to true.

[2] Before Firefox 32, Gecko wasn't able to animate values starting or stopping at 0(SpecDemo).

See also