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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

/* 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 value none
Applies to all elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements
Inherited no
Computed value as specified, but with url() values made absolute
Animation type discrete

Formal syntax

mask-border-source = 
none |
<image>

<image> =
<url> |
<gradient>

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

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

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

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Note: The mask-border page features a working example (using the out-of-date prefixed border mask properties supported in Chromium), so you can get an idea of the effect.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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
mask-border-source 1 79
NoSee bug 877294.
No 15 3.1 4.4 18
NoSee bug 877294.
14 3 1.0

See also

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https://developer.mozilla.org/en-US/docs/Web/CSS/mask-border-source