The <flex> CSS data type denotes a flexible length within a grid container, which is declared as dimension with the unit fr.
1fr /* Using an integer value */ 2.5fr /* Using a float value */
| Specification | Status | Comment |
|---|---|---|
| CSS Grid Layout The definition of '<flex>' in that specification. | Working Draft | Initial definition |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | No support[1] | 20 (12.10240) | No support[2] | 10.0 | No support[1] | Nightly build |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | No support | No support[2] | 10.0 | No support | No support |
[1] Implemented behind the experimental Web Platform features flag in chrome://flags since Chrome 29.0 and Opera 28.0.
[2] Implemented behind the preference layout.css.grid.enabled, defaulting to false.
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https://developer.mozilla.org/en-US/docs/Web/CSS/flex_value