mask-border-source

The mask-border-source CSS property sets the source image used to create an element's mask border.

The mask-border-slice property is used to divide the source image into regions, which are then dynamically applied to the final mask border.

Syntax

css
/* Keyword value */
mask-border-source: none;

/* <image> values */
mask-border-source: url(image.jpg);
mask-border-source: linear-gradient(to top, red, yellow);

/* Global values */
mask-border-source: inherit;
mask-border-source: initial;
mask-border-source: revert;
mask-border-source: revert-layer;
mask-border-source: unset;

Values

none

No mask border is used.

<image>

Image reference to use for the mask border.

Formal definition

Initial valuenone
Applies toall elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements
Inheritedno
Computed valueas specified, but with url() values made absolute
Animation typediscrete

Formal syntax

mask-border-source = 
  none     |
  <image>  

<image> = 
  <url>       |
  <gradient>  

<url> = 
  <url()>  |
  <src()>  

<url()> = 
  url( <string> <url-modifier>* )  |
  <url-token>                      

<src()> = 
  src( <string> <url-modifier>* )

Examples

Basic usage

This property doesn't appear to be supported anywhere yet. When it eventually starts to be supported, it will serve to define the source of the border mask.

css
mask-border-source: url(image.jpg);

Chromium-based browsers support an outdated version of this property — mask-box-image-source — with a prefix:

css
-webkit-mask-box-image-source: url(image.jpg);

Note: The mask-border page features a working example (using the out-of-date prefixed border mask properties supported in Chromium), so you can get an idea of the effect.

Specifications

Specification
CSS Masking Module Level 1
# the-mask-border-source

Browser compatibility

BCD tables only load in the browser

See also