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What is CSS flex basis?
The CSS flex-basis property only applies to flex items. By using it, you can set the initial length for flex items:
Example
a:nth-of-type(3) {
-webkit-flex-basis: 50px; /* Safari 6.1 and newer */
flex-basis: 50px;
}The CSS flex-basis property syntax
The syntax for the flex-basis property is as follows:
flex-basis:value;
The available property values are presented in the following section.
Theory is great, but we recommend digging deeper!
Property values
| Value | Description |
|---|---|
auto |
The default value. The size of the element depends on width and height properties |
content |
The size of the element depends on its content |
| Length units | The initial size of the flex item defined in CSS length units (e.g., px) |
| Percentages | The initial size of the flex item defined in percentages, representing the relation to the size of the parent flex container |
Browser support
Chrome
29+
Edge
12+
Firefox
22+
IE
11+
Opera
12.1+
Safari
9+
Mobile browser support
Chrome
29+
Firefox
22+
Opera
12.1+
Safari
9+