<pre class="brush: css notranslate"><code><span class="token comment">/ Keyword value /</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span> <span class="token comment">/ &lt;image&gt; values /</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> <span class="token url"><span class="token function">url</span><span class="token punctuation">(</span>image.jpg<span class="token punctuation">)</span></span><span class="token punctuation">;</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> <span class="token function">linear-gradient</span><span class="token punctuation">(</span>to top<span class="token punctuation">,</span> red<span class="token punctuation">,</span> yellow<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">/ Global values /</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> inherit<span class="token punctuation">;</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> initial<span class="token punctuation">;</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> revert<span class="token punctuation">;</span> <span class="token property">mask-border-source</span><span class="token punctuation">:</span> unset<span class="token punctuation">;</span> </code></pre>

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: unset; 

Values

No mask border is used.

Image reference to use for the mask border.

Formal definition

Formal syntax

none | <image>
where <image> = <url> | <image()> | <image-set()> | <element()> | <paint()> | <cross-fade()> | <gradient>
where <image()> = image( <image-tags>? [ <image-src>? , <color>? ]! )<image-set()> = image-set( <image-set-option># )<element()> = element( <id-selector> )<paint()> = paint( <ident>, <declaration-value>? )<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()> | <conic-gradient()>
where <image-tags> = ltr | rtl<image-src> = <url> | <string><color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hwb()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color><image-set-option> = [ <image> | <string> ] [ <resolution> || type(<string>) ]<id-selector> = <hash-token><cf-mixing-image> = <percentage>? && <image><cf-final-image> = <image> | <color><linear-gradient()> = linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )<repeating-linear-gradient()> = repeating-linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )<radial-gradient()> = radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )<repeating-radial-gradient()> = repeating-radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )<conic-gradient()> = conic-gradient( [ from <angle> ]? [ at <position> ]?, <angular-color-stop-list> )
where <rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )<hwb()> = hwb( [<hue> | none] [<percentage> | none] [<percentage> | none] [ / [<alpha-value> | none] ]? )<side-or-corner> = [ left | right ] || [ top | bottom ]<color-stop-list> = [ <linear-color-stop> [, <linear-color-hint>]? ]# , <linear-color-stop><ending-shape> = circle | ellipse<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]<angular-color-stop-list> = [ <angular-color-stop> [, <angular-color-hint>]? ]# , <angular-color-stop>
where <alpha-value> = <number> | <percentage><hue> = <number> | <angle><linear-color-stop> = <color> <color-stop-length>?<linear-color-hint> = <length-percentage><length-percentage> = <length> | <percentage><angular-color-stop> = <color> && <color-stop-angle>?<angular-color-hint> = <angle-percentage>
where <color-stop-length> = <length-percentage>{1,2}<color-stop-angle> = <angle-percentage>{1,2}<angle-percentage> = <angle> | <percentage>

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

See also

Last modified: Aug 12, 2021, by MDN contributors