-webkit-mask-composite - CSS: Cascading Style Sheets 编辑

Non-standard

This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The -webkit-mask-composite property specifies the manner in which multiple mask images applied to the same element are composited with one another. Mask images are composited in the opposite order that they are declared with the -webkit-mask-image property.

/* Keyword values */
-webkit-mask-composite: clear;
-webkit-mask-composite: copy;
-webkit-mask-composite: source-over;
-webkit-mask-composite: source-in;
-webkit-mask-composite: source-out;
-webkit-mask-composite: source-atop;
-webkit-mask-composite: destination-over;
-webkit-mask-composite: destination-in;
-webkit-mask-composite: destination-out;
-webkit-mask-composite: destination-atop;
-webkit-mask-composite: xor;

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

There is a standardized mask-composite property covering parts of this non-standard property using different keywords.

Syntax

Values

clear

Overlapping pixels in the source mask image and the destination mask image are cleared.

copy

The source mask image replaces the destination mask image.

source-over

The source mask image is rendered over the destination mask image.

source-in

Overlapping pixels in the source mask image and the destination mask image are replaced by the pixels of the source mask image; all other pixels are cleared.

source-out

Overlapping pixels in the source mask image and the destination mask image are cleared; all remaining pixels of the source mask image are rendered.

source-atop

The pixels of the destination mask image are rendered. The pixels of the source mask image are rendered only if they overlap a nontransparent portion of the destination mask image. This causes the source mask image to have no effect.

destination-over

The destination mask image is rendered over the source mask image.

destination-in

Overlapping pixels in the source mask image and the destination mask image remain the pixels of the destination mask image; all other pixels are cleared.

destination-out

Overlapping pixels in the source mask image and the destination mask image are cleared; all remaining pixels of the source mask image are rendered.

destination-atop

The pixels of the source mask image are rendered. The pixels of the destination mask image are rendered only if they overlap a nontransparent portion of the destination mask image. This causes the destination mask image to have no effect.

xor

Overlapping pixels in the source mask image and the destination mask image become fully transparent if they are both fully opaque.

Formal definition

Formal syntax

<composite-style>#
where 
<composite-style> = clear | copy | source-over | source-in | source-out | source-atop | destination-over | destination-in | destination-out | destination-atop | xor

Examples

Compositing with XOR

.example {
  -webkit-mask-image: url(mask1.png), url('mask2.png');
  -webkit-mask-composite: xor, source-over;
}

Specifications

Not part of any standard. This property is specified as mask-composite using different values.

Browser compatibility

BCD tables only load in the browser

See also

• mask-composite