border-image
Baseline: Widely supported
Baseline is determined by this web feature being supported on the current and the previous major versions of major browsers.
The border-image
CSS property draws an image around a given element. It replaces the element's regular border.
Try it
Note: You should specify a separate border-style
in case the border image fails to load. Although the specification doesn't strictly require it, some browsers don't render the border image if border-style
is none
or border-width
is 0
.
Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
css
/* source | slice */
border-image: linear-gradient(red, blue) 27;
/* source | slice | repeat */
border-image: url("/images/border.png") 27 space;
/* source | slice | width */
border-image: linear-gradient(red, blue) 27 / 35px;
/* source | slice | width | outset | repeat */
border-image: url("/images/border.png") 27 23 / 50px 30px / 1rem round space;
/* Global values */
border-image: inherit;
border-image: initial;
border-image: revert;
border-image: revert-layer;
border-image: unset;
The border-image
property may be specified with anywhere from one to five of the values listed below.
Note: If the computed value of border-image-source
is none
, or if the image cannot be displayed, the border-style
will be displayed instead.
Values
<'border-image-source'>
-
The source image. See
border-image-source
. <'border-image-slice'>
-
The dimensions for slicing the source image into regions. Up to four values may be specified. See
border-image-slice
. <'border-image-width'>
-
The width of the border image. Up to four values may be specified. See
border-image-width
. <'border-image-outset'>
-
The distance of the border image from the element's outside edge. Up to four values may be specified. See
border-image-outset
. <'border-image-repeat'>
-
Defines how the edge regions of the source image are adjusted to fit the dimensions of the border image. Up to two values may be specified. See
border-image-repeat
.
Accessibility concerns
Assistive technology cannot parse border images. If the image contains information critical to understanding the page's overall purpose, it is better to describe it semantically in the document.
Formal definition
Initial value | as each of the properties of the shorthand:
|
---|---|
Applies to | all elements, except internal table elements when border-collapse is collapse . It also applies to ::first-letter . |
Inherited | no |
Percentages | as each of the properties of the shorthand:
|
Computed value | as each of the properties of the shorthand:
|
Animation type | as each of the properties of the shorthand:
|
Formal syntax
Examples
Bitmap
In this example, we will apply a diamond pattern to an element's borders. The source for the border image is a ".png" file of 81 by 81 pixels, with three diamonds going vertically and horizontally:
HTML
html
<div id="bitmap">
This element is surrounded by a bitmap-based border image!
</div>
CSS
To match the size of a single diamond, we will use a value of 81 divided by 3, or 27
, for slicing the image into corner and edge regions. To center the border image on the edge of the element's background, we will make the outset values equal to half of the width values. Finally, a repeat value of round
will make the border slices fit evenly, i.e., without clipping or gaps.
css
#bitmap {
width: 200px;
background-color: #ffa;
border: 36px solid orange;
margin: 30px;
padding: 10px;
border-image: url("border.png") /* source */ 27 / /* slice */ 36px 28px 18px
8px / /* width */ 18px 14px 9px 4px /* outset */ round; /* repeat */
}
Result
Gradient
HTML
html
<div id="gradient">
This element is surrounded by a gradient-based border image!
</div>
CSS
css
#gradient {
width: 200px;
border: 30px solid;
border-image: repeating-linear-gradient(45deg, #f33, #3bf, #f33 30px) 60;
padding: 20px;
}
Result
Specifications
Specification |
---|
CSS Backgrounds and Borders Module Level 3 # the-border-image |
Browser compatibility
BCD tables only load in the browser
See also
border
outline
box-shadow
background-image
url()
function- Gradient functions:
conic-gradient()
,repeating-conic-gradient()
,linear-gradient()
,repeating-linear-gradient()
,radial-gradient()
,repeating-radial-gradient()