CSS border-image-source

The CSS border-image-source property is one of the properties introduced in CSS3 for the purposes of enabling images to be used on CSS borders.

The border-image-source property is used for specifying an image location to be used as a border.

The border-image-source property is used in conjunction with the border-image-slice, border-image-width, border-image-outset, and border-image-repeat properties in order to determine how the image will appear on the border.

Note that setting an image border will override any border that has been specified using the border-style properties. However, if the image cannot be loaded, or if the border-image-source value is none, the border styles will be used instead.

Syntax

Possible Values

none

Specifies that no image is to be used.

<image>

Specifies the location of the image to be used. For example, http://www.example.com/images/myimage.png

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial

Represents the value specified as the property's initial value.

inherit

Represents the computed value of the property on the element's parent.

unset

This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

Basic Property Information

Example Code

Basic CSS

Working Example within an HTML Document

CSS Specifications

• The border-image-source property is defined in CSS Backgrounds and Borders Module Level 3 (W3C Candidate Recommendation 9 September 2014)

Browser Support

The following table provided by Caniuse.com shows the level of browser support for this feature.

Vendor Prefixes

For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari, Google Chrome, and Opera (newer versions), -ms- for Internet Explorer, -moz- for Firefox, -o- for older versions of Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.

This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.

The major browser manufacturers generally strive to adhere to the W3C specifications, and when they support a non-prefixed property, they typically remove the prefixed version. Also, W3C advises vendors to remove their prefixes for properties that reach Candidate Recommendation status.

Many developers use Autoprefixer, which is a postprocessor for CSS. Autoprefixer automatically adds vendor prefixes to your CSS so that you don't need to. It also removes old, unnecessary prefixes from your CSS.

You can also use Autoprefixer with preprocessors such as Less and Sass.