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CSS flex-basis Property

Last Updated:

Demo

CSS 'flex-basis' property belongs to child element and not to the parent element. In this demo, we are targeting 'Div 2' child element.

CSS flex-basis Property

CSS flex-basis property sets the initial main size of a flex item.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <head> <style> #parent{ display: flex; width: 100%; border: 1px solid #8c8c8c; width: 500px; } #parent > div{ border: 1px solid #267326; padding: 25px 0; text-align: center; flex-basis: 100px; -webkit-flex-basis: 100px; } #parent > div:nth-child(2){ flex-basis: 200px; -webkit-flex-basis: 200px; } </style> </head> <body> <h1>CSS flex-basis Property</h1> <div id="parent"> <div>Div 1</div> <div>Div 2</div> <div>Div 3</div> </div> </body> </html>

Syntax

Using CSS

element{ flex-basis: 300px; }

Using Javascript

object.style.flexBasis="300px";

Animatable

Yes, flex-basis property is animatable. CSS Animatable Properties Reference.

Default Value

Default value for CSS flex-basis property is auto.

Property Value

The following table provides a list of values for CSS flex-basis property.

ValueExplanation
auto The length is equal to the length of the flexible item.
length Allows you to define the size of the font in any CSS length unit.

Browser Support

Devicedesktopmobile
Browsergoogle chromesafarifirefoxinternet Exploreredgeoperagoogle chromesafarifirefoxedgeoperaandroid webviewsamsung internet
flex-basisYesYesYesYesYesYesYesYesYesYesYesYesYes

Using JavaScript

In the following example, we will demonstrate how to change the CSS flex-basis property of an element using JavaScript.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <head> <style> #parent{ display: flex; width: 100%; border: 1px solid #8c8c8c; width: 500px; } #parent > div{ border: 1px solid #267326; padding: 25px 0; text-align: center; flex-basis: 100px; -webkit-flex-basis: 100px; } </style> </head> <body> <h1>CSS flex-basis Property</h1> <div id="parent"> <div>Div 1</div> <div>Div 2</div> <div>Div 3</div> </div> <button onclick="myFunction()">Click Me</button> <script> var x = document.getElementById("parent").firstElementChild; function myFunction(){ x.style.flexBasis = "200px"; x.style.WebkitFlexBasis = "200px"; } </script> </body> </html>

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