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border property

Specifies the properties of a border drawn around an object.

CSS Backgrounds and Borders Module Level 3, Section 4.4

 

Syntax

border: <border-width> || <border-style> || <border-color>

Property values

One or more of the following space-delimited values:

border-width

Any of the range of width values available to the border-width property.

border-style

Any of the range of style values available to the border-style property.

border-color

Any of the range of color values available to the border-color property.

CSS information

Applies ToAll elements
Mediavisual
Inheritedno
Initial Value(see individual properties)

Standards information

Remarks

The border property is a composite property that sets the width, style, and color values for all four sides of an object. Unlike the shorthand margin and padding properties, the border property can't set different values on the four borders. To do that, one or more of the other border properties (that is, border-bottom, border-left, and so on) must be used.

You must specify a style when specifying a width or color; otherwise, the border does not render.

All individual border properties not set by the composite border property are set to their default values. For example, the default value for width is "medium".

The declaration "border: thin" is identical to "border: thin none"; the default value for the border color is the same as the text color if one is not initially set. Therefore, not only does this declaration set width to "thin", it also clears any style or color values previously set.

Setting a border to 0 or omitting the border property causes no border to be displayed. Supplying the border property without a value defaults to a single border.

If a color is not specified, the text color is used.

For more information about supported colors, see the Color Table.

The below image shows the content, padding, border, and margin areas of a basic box. The red labels illustrate the edges of each of these areas.

An illustration of the basic box model

Examples

This example uses the border property to create a square with a purple border.


<body>
   <div class="square"></div>
</body>

The following image shows the result of the CSS below.

An element styled with the border property


.square {
   height: 50px;
   width: 50px;
   border: .5em ridge #800080;
}

See also

CSSStyleDeclaration
currentStyle
defaults
runtimeStyle
style
border-width
border-style
border-color

 

 

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