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CSS border-image-slice Property

The border-image-slice property divides the image specified by border-image-source in nine regions: four corners, four edges, and a middle. It does this by specifying 4 inwards offsets that typically creates a three by three grid.

The middle part of the border image is discarded and not used by the border itself but is used as a background-image if the fill keyword is present.

CSS Demo: border-image-slice

border-image-slice: 30%;
border-image-slice: 45%;
border-image-slice: 30 fill;
This is a box with a border around it

The border-image-slice property can have from one to four values:

  • When one position is specified, it creates all four slices at the same distance from their respective sides.
  • When two positions are specified, the first value creates slices measured from the top and bottom, the second creates slices measured from the left and right.
  • When three positions are specified, the first value creates a slice measured from the top, the second creates slices measured from the left and right, the third creates a slice measured from the bottom.
  • When four positions are specified, they create slices measured from the top, right, bottom and left in that order (clockwise).

Technical Details

Default value 100%
Applies to all elements, except internal table elements when border-collapse is collapse
Inherited no
Computed value as specified
Animatable no See animatable properties.
Version CSS3
JavaScript syntax object.style.borderImageSlice = "40%"

CSS Syntax:

border-image-slice: number|percentage|fill|initial|inherit;


The following example shows how to use border-image-slice property:

Run code

Browser compatibility

The numbers in the table specify the first browser version that fully supports the border-image-slice property:

border-image-slice 15 15 15 6 12

Property Values

The following table describes the values of border-image-slice property:

Value Description
fill Causes the middle part of the image to be displayed
number Represent pixels for raster images or coordinates for vector images
percentage Percentages are relative to the height or width of the image
initial Sets this property to its default value
inherit Inherits this property from its parent element

See also

CSS Border Image tutorial

CSS border-image property

CSS border-image-outset property

CSS border-image-width property

CSS border-image-repeat property