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CSS Reference

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CSS Properties

animation
appearance
backface-visibility
background
border
bottom
box
caption-side
clear
clip
color
column
content
counter-increment
counter-reset
cursor
direction
display
empty-cells
float
font
grid-columns
grid-rows
hanging-punctuation
height
icon
@keyframes
left
letter-spacing
line-height
list-style
margin
max-height
max-width
min-height
min-width
nav
opacity
outline
overflow
overflow-x
overflow-y
padding
page-break
perspective
perspective-origin
position
punctuation-trim
quotes
resize
right
rotation
rotation-point
table-layout
target
text
top
transform
transition
vertical-align
visibility
width
white-space
word-spacing
word-break
word-wrap
z-index

CSS3 box-sizing Property

CSS Reference Complete CSS Reference

Example

Specify two bordered boxes side by side:

div
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
-webkit-box-sizing:border-box; /* Safari */
width:50%;
float:left;
}

Try it yourself »

Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The box-sizing property is supported in Internet Explorer, Opera, and Chrome.

Firefox supports an alternative, the -moz-box-sizing property.

Safari supports an alternative, the -webkit-box-sizing property.

Definition and Usage

The box-sizing property allows you to define certain elements to fit an area in a certain way.

For example, if you’d like 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
Version: CSS3
JavaScript syntax: object.style.boxSizing="border-box"

Syntax

box-sizing: content-box|border-box|inherit:

Value Description
content-box This is the behavior of width and height as specified by CSS2.1. The specified width and height (and min/max properties) apply to the width and height respectively of the content box of the element. The padding and border of the element are laid out and drawn outside the specified width and height
border-box The specified width and height (and min/max properties) on this element determine the border box of the element. That is, any padding or border specified on the element is laid out and drawn inside this specified width and height. The content width and height are calculated by subtracting the border and padding widths of the respective sides from the specified 'width' and 'height' properties
inherit Specifies that the value of the box-sizing property should be inherited from the parent element

Related Pages

CSS3 tutorial: CSS3 User Interface

CSS Reference Complete CSS Reference
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