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/CSS

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: revert;
mask-composite: revert-layer;
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

mask-composite = 
  <compositing-operator>#  

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

Examples

Compositing mask layers with addition

Specifications

Specification
CSS Masking Module Level 1 # the-mask-composite

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-composite`	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	18–79	53	No	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	15.4 See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	53	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	15.4 See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.	No See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.