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CSS3 border-image-outset Property

Topic: CSS3 Properties ReferencePrev|Next


The border-image-outset CSS property specifies the amount by which the border image area extends beyond the border box.

The following table summarizes the usages context and the version history of this property.

Default value: 0
Applies to: All elements, except internal table elements when
border-collapse is collapse. It also applies to ::first-letter.
Inherited: No
Animatable: No. See animatable properties.
Version: New in CSS3


The syntax of the property is given with:

border-image-outset length | number | initial | inherit

The example below shows the border-image-outset property in action.

.box {
    width: 300px;
    height: 150px;
    border: 15px solid transparent;
    border-image-source: url("border.png");
    border-image-slice: 30;
    border-image-outset: 15px;

Property Values

The following table describes the values of this property.

Value Description
length Specifies the distance in absolute or relative units that the border image extends beyond the border box. Negative values are not allowed.
number Represents a multiple of the computed value of border-width, or the width of the border box. Negative values are not allowed.
initial Sets this property to its default value.
inherit If specified, the associated element takes the computed value of its parent element border-image-outset property.

Browser Compatibility

The border-image-outset property is supported in all major modern browsers.

Browsers Icon

Basic Support—

  • Firefox 15+
  • Google Chrome 15+
  • Internet Explorer 11+
  • Apple Safari 6+
  • Opera 15+

Further Reading

See tutorial on: CSS3 Border, CSS Border.

Related properties: border-image, border-image-source, border-image-slice, border-image-width, border-image-repeat, border.

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