border-image CSS property

Try it

border-image: url("../../../../../../shared-assets/images/examples/border-diamonds.png") 30;

border-image: url("../../../../../../shared-assets/images/examples/border-diamonds.png") 30 /
  19px round;

border-image: url("../../../../../../shared-assets/images/examples/border-diamonds.png") 30
  fill / 30px / 30px space;

border-image: linear-gradient(#f6b73c, #4d9f0c) 30;

border-image: repeating-linear-gradient(30deg, #4d9f0c, #9198e5, #4d9f0c 20px)
  60;

<section id="default-example">
  <div id="example-element">This is a box with a border around it.</div>
</section>

#example-element {
  width: 80%;
  height: 80%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 50px;
  background: #fff3d4;
  color: black;
  border: 30px solid;
  border-image: url("../../../../../../shared-assets/images/examples/border-diamonds.png") 30
    round;
  font-size: 1.2em;
}

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: revert-layer;
border-image: unset;

The border-image property may be specified with anywhere from one to five of the values listed below.

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

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 2.0

Formal definition

Formal syntax

border-image = 
  <'border-image-source'>                             ||
  <'border-image-slice'> [ / <'border-image-width'> | / <'border-image-width'>? / <'border-image-outset'> ]?  ||
  <'border-image-repeat'>                             

<border-image-source> = 
  none     |
  <image>  

<border-image-slice> = 
  [ <number [0,∞]> | <percentage [0,∞]> ]{1,4}  &&
  fill?                                         

<border-image-width> = 
  [ <length-percentage [0,∞]> | <number [0,∞]> | auto ]{1,4}  

<border-image-outset> = 
  [ <length [0,∞]> | <number [0,∞]> ]{1,4}  

<border-image-repeat> = 
  [ stretch | repeat | round | space ]{1,2}  

<image> = 
  <url>           |
  <image()>       |
  <image-set()>   |
  <cross-fade()>  |
  <element()>     |
  <gradient>      

<length-percentage> = 
  <length>      |
  <percentage>  

<image()> = 
  image( <image-tags>? [ <image-src>? , <color>? ]! )  

<image-set()> = 
  image-set( <image-set-option># )  

<cross-fade()> = 
  cross-fade( <cf-image># )  

<element()> = 
  element( <id-selector> )  

<image-tags> = 
  ltr  |
  rtl  

<image-src> = 
  <url>     |
  <string>  

<image-set-option> = 
  [ <image> | <string> ] [ <resolution> || type( <string> ) ]?  

<cf-image> = 
  [ <image> | <color> ]  &&
  <percentage [0,100]>?  

<id-selector> = 
  <hash-token>  

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: #ffffaa;
  border: 36px solid orange;
  margin: 30px;
  padding: 10px;

  border-image: url("border.png") 27 / 36px 28px 18px 8px / 18px 14px 9px 4px
    round;
}

Result

Gradient

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, #ff3333, #33bbff, #ff3333 30px)
    60;
  padding: 20px;
}

Result

Rounded borders

border-radius has no effect on the border image. This is because border-image-outset is able to place the image outside the border box, so it doesn't make sense for the border image to be clipped by the border area. To create rounded borders when using a border image, you should create the image itself with rounded corners, or, in the case of a gradient, draw it as the background instead. Below, we show one approach to do this, which is to use two background-images: one that extends the border box, and another for the padding box.

HTML

<div id="rounded">
  This element is surrounded by a border image with rounded corners!
</div>

CSS

#rounded {
  width: 200px;
  /* Use transparent so the background image is visible */
  border: 10px solid transparent;
  padding: 20px;
  border-radius: 20px;
  background-image:
    linear-gradient(white, white), linear-gradient(to right, cyan, lime);
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

Result

Specifications

Browser compatibility

See also

• border
• outline
• box-shadow
• background-image
• <url> type
• Gradient functions: conic-gradient(), repeating-conic-gradient(), linear-gradient(), repeating-linear-gradient(), radial-gradient(), repeating-radial-gradient()
• Border images in CSS: A key focus area for Interop 2023 on MDN blog (2023)