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: 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
Specifications
| Specification |
|---|
| CSS Masking Module Level 1 # the-mask-composite |
Browser compatibility
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