-webkit-mask-composite

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.

Initial valuesource-over
Applies toall elements
Inheritedno
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderorder of appearance in the formal grammar of the values

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 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

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

Specifications

This property is specified as mask-composite using different values.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Non-standard
Chrome Full support 1Edge Full support 18Firefox No support NoIE No support NoOpera No support NoSafari Full support 4WebView Android Full support 2.2Chrome Android Full support YesEdge Mobile ? Firefox Android No support NoOpera Android No support NoSafari iOS Full support 3.2Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.

See also