mask-composite
Quick Summary for mask-composite
The mask-composite CSS property represents a compositing operation used on the current mask layer with the mask layers below it.
Code Usage for mask-composite
/* 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; 
More Details for mask-composite

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 valueadd
Applies toall elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inheritedno
Computed valueas specified
Animation typediscrete

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

See also

Clipping and Masking in CSS

Last modified: Aug 12, 2021, by MDN contributors

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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."

I just checked google books for BFG, and the dedication is there. 

https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1 


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