# CSS3 box-sizing Property

## Example

Specify two bordered boxes side by side:

div {
box-sizing: border-box;
width: 50%;
float: left;
}
Try it yourself »

## Definition and Usage

The box-sizing property is used to tell the browser what the sizing properties (width and height) should include.

Should they include the border-box or just the content-box which is the default value of the width and height properties.

For example, if you want two bordered boxes side by side, it can be achieved through setting box-sizing to "border-box". This forces the browser to render the box with the specified width and height, and place the border and padding inside the box.

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
--- | ---
content-box | Default. The width and height properties (and min/max properties) includes only the content. Border, padding, or margin are not included
border-box | The width and height properties (and min/max properties) includes content, padding and border, but not the margin
initial | Sets this property to its default value. Read about initial
inherit | Inherits this property from its parent element. Read about inherit

## Related Pages

CSS3 tutorial: CSS3 User Interface

HTML DOM reference: boxSizing property

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