Web/CSS/-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.

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

Initial value	`source-over`
Applies to	all elements
Inherited	no
Computed value	as specified
Animation type	discrete

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

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`-webkit-mask-composite` Non-standard'	Chrome Full support 1	Edge Full support 18	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 3.2	WebView Android Full support 2	Chrome Android Full support 18	Firefox Android Full support 53	Opera Android Full support 14	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.