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CSS Reference

CSS Reference CSS Selectors CSS Reference Aural CSS Web Safe Fonts CSS Units CSS Colors CSS Color Values CSS Color Names CSS Color HEX CSS3 Browser Support

CSS Properties

align-content align-items align-self animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-shadow box-sizing caption-side clear clip color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-size font-size-adjust font-stretch font-style font-variant font-weight hanging-punctuation height icon justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width min-height min-width nav-down nav-index nav-left nav-right nav-up opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin position quotes resize right tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi vertical-align visibility white-space width word-break word-spacing word-wrap z-index

CSS3 box-sizing Property


Example

Specify two bordered boxes side by side:

div
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
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, Chrome, and Safari.

Firefox supports an alternative, the -moz-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 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


CSS Syntax

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

Property Values

Value Description
content-box Default value. 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
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



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