border-image
Quick Summary for border-image
Code Usage for border-image
/* 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: unset;
More Details for border-image
border-image
The border-image
CSS property draws an image around a given element. It replaces the element's regular border.
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:
border-image-outset
border-image-repeat
border-image-slice
border-image-source
border-image-width
Syntax
/* 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: 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.
MDN Understanding WCAG, Guideline 1.1 explanations Understanding Success Criterion 1.1.1 | Understanding WCAG 2.0Formal definition
Initial value | as each of the properties of the shorthand:border-image-source : none border-image-slice : 100% border-image-width : 1 border-image-outset : 0 border-image-repeat : stretch |
---|---|
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:border-image-slice : refer to the size of the border imageborder-image-width : refer to the width or height of the border image area |
Computed value | as each of the properties of the shorthand:border-image-outset : as specified, but with relative lengths converted into absolute lengthsborder-image-repeat : as specifiedborder-image-slice : one to four percentage(s) (as specified) or absolute length(s), plus the keyword fill if specifiedborder-image-source : none or the image with its URI made absoluteborder-image-width : as specified, but with relative lengths converted into absolute lengths |
Animation type | discrete |
Formal syntax
<'border-image-source'> || <'border-image-slice'> [ / <'border-image-width'> | / <'border-image-width'>? / <'border-image-outset'> ]? || <'border-image-repeat'>
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
<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.
#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 */ }
ResultGradient
HTML<div id="gradient">This element is surrounded by a gradient-based border image!</div>
CSS #gradient { width: 200px; border: 30px solid; border-image: repeating-linear-gradient(45deg, #f33, #3bf, #f33 30px) 60; padding: 20px; }
ResultSpecifications
Specification |
---|
CSS Backgrounds and Borders Module Level 4 # the-border-image |
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()
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