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mask-composite

The mask-composite CSS property represents a compositing operation used on the current mask layer with the mask layers below it.

/* Keyword values */
mask-composite: add;
mask-composite: subtract;
mask-composite: intersect;
mask-composite: exclude;

/* Global values */
mask-composite: inherit;
mask-composite: initial;
mask-composite: unset;

Syntax

One or more of the keyword values listed below, separated by commas.

Values

For the composition the current mask layer is referred to as source, while all layers below it are referred to as destination.

add
The source is placed over the destination.
subtract
The source is placed, where it falls outside of the destination.
intersect
The parts of source that overlap the destination, replace the destination.
exclude
The non-overlapping regions of source and destination are combined.

Formal definition

Initial value add
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
Animation type discrete

Formal syntax

<compositing-operator>#

where
<compositing-operator> = add | subtract | intersect | exclude

Examples

Compositing mask layers with addition

CSS

#masked {
  width: 100px;
  height: 100px;
  background-color: #8cffa0;
  mask-image: url(https://mdn.mozillademos.org/files/12668/MDN.svg),
              url(https://mdn.mozillademos.org/files/12676/star.svg);
  mask-size: 100% 100%;
  mask-composite: add; /* Can be changed in the live sample */
}

Result

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of 'mask-composite' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
mask-composite No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
18 — 79 53 No No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
mask-composite No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
53 No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.
No
No
See also -webkit-mask-composite for a similar non-standard property that uses different keywords.

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