CSS box-sizing Property
Example
Include padding and border in the element's total width and height:
#example1 {
box-sizing: border-box;
}
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The box-sizing property defines how the width and height of an element are
calculated: should they include padding and borders, or not.
| Default value: | content-box |
|---|---|
| Inherited: | no |
| Animatable: | no. Read about animatable |
| Version: | CSS3 |
| JavaScript syntax: | object.style.boxSizing="border-box" Try it |
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
Numbers followed by -webkit- or -moz- specify the first version that worked with a prefix.
| Property | |||||
|---|---|---|---|---|---|
| box-sizing | 10.0 4.0 -webkit- |
8.0 | 29.0 2.0 -moz- |
5.1 3.2 -webkit- |
9.5 |
CSS Syntax
box-sizing: content-box|border-box|initial|inherit;
Property Values
| Value | Description | Demo |
|---|---|---|
| content-box | Default. The width and height properties (and min/max properties) includes only the content. Border and padding are not included | Demo ❯ |
| border-box | The width and height properties (and min/max properties) includes content, padding and border | Demo ❯ |
| initial | Sets this property to its default value. Read about initial | |
| inherit | Inherits this property from its parent element. Read about inherit |
More Examples
Example
Specify two bordered boxes side by side:
div
{
box-sizing: border-box;
width: 50%;
border: 5px solid red;
float: left;
}
Try it Yourself »
Related Pages
CSS tutorial: CSS Box Sizing
HTML DOM reference: boxSizing property
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