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mask-image

The mask-image CSS property sets the image that is used as mask layer for an element.

/* Keyword value */
mask-image: none;

/* <mask-source> value */
mask-image: url(masks.svg#mask1);

/* <image> values */
mask-image: linear-gradient(rgba(0, 0, 0, 1.0), transparent);
mask-image: image(url(mask.png), skyblue);

/* Multiple values */
mask-image: image(url(mask.png), skyblue), linear-gradient(rgba(0, 0, 0, 1.0), transparent);

/* Global values */
mask-image: inherit;
mask-image: initial;
mask-image: unset;

Syntax

Values

none
This keyword is interpreted as a transparent black image layer.
<mask-source>
A <url> reference to a <mask> or to a CSS image.
<image>
An image value used as mask image layer.

Formal definition

Initial value none
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, but with <url> values made absolute
Animation type discrete

Formal syntax

<mask-reference>#

where
<mask-reference> = none | <image> | <mask-source>

where
<image> = <url> | <image()> | <image-set()> | <element()> | <paint()> | <cross-fade()> | <gradient>
<mask-source> = <url>

where
<image()> = image( <image-tags>? [ <image-src>? , <color>? ]! )
<image-set()> = image-set( <image-set-option># )
<element()> = element( <id-selector> )
<paint()> = paint( <ident>, <declaration-value>? )
<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )
<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()> | <conic-gradient()>

where
<image-tags> = ltr | rtl
<image-src> = <url> | <string>
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
<image-set-option> = [ <image> | <string> ] <resolution>
<id-selector> = <hash-token>
<cf-mixing-image> = <percentage>? && <image>
<cf-final-image> = <image> | <color>
<linear-gradient()> = linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<repeating-linear-gradient()> = repeating-linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<radial-gradient()> = radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<repeating-radial-gradient()> = repeating-radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<conic-gradient()> = conic-gradient( [ from <angle> ]? [ at <position> ]?, <angular-color-stop-list> )

where
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )
<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )
<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )
<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )
<side-or-corner> = [ left | right ] || [ top | bottom ]
<color-stop-list> = [ <linear-color-stop> [, <linear-color-hint>]? ]# , <linear-color-stop>
<ending-shape> = circle | ellipse
<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]
<angular-color-stop-list> = [ <angular-color-stop> [, <angular-color-hint>]? ]# , <angular-color-stop>

where
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<linear-color-stop> = <color> <color-stop-length>?
<linear-color-hint> = <length-percentage>
<length-percentage> = <length> | <percentage>
<angular-color-stop> = <color> && <color-stop-angle>?
<angular-color-hint> = <angle-percentage>

where
<color-stop-length> = <length-percentage>{1,2}
<color-stop-angle> = <angle-percentage>{1,2}
<angle-percentage> = <angle> | <percentage>

Examples

Setting a mask image with a URL

HTML

<div id="masked"></div>

CSS

#masked {
  width: 100px;
  height: 100px;
  background-color: #8cffa0;
  -webkit-mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
  mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
}

Result

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of 'mask-image' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
mask-image 1
Prefixed
1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
From version 8, Chrome added support for gradient values. Initially, Chrome supported only -webkit- prefixed values for gradients (such as -webkit-linear-gradient()). Later, support for unprefixed values was added.
16 53 No 15
Prefixed
15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
4
Prefixed
4
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Initially, Safari supported only -webkit- prefixed values for gradients (such as -webkit-linear-gradient()). Later, support for unprefixed values was added.
Multiple mask images 1 18 53 No 15 4
SVG masks 8 18 53 No 15 4
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
mask-image 2
Prefixed
2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Initially, Android supported only -webkit- prefixed values for gradients (such as -webkit-linear-gradient()). Later, support for unprefixed values was added.
18
Prefixed
18
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
From version 8, Chrome added support for gradient values. Initially, Chrome supported only -webkit- prefixed values for gradients (such as -webkit-linear-gradient()). Later, support for unprefixed values was added.
53 14
Prefixed
14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
3.2
Prefixed
3.2
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Initially, Safari supported only -webkit- prefixed values for gradients (such as -webkit-linear-gradient()). Later, support for unprefixed values was added.
1.0
Prefixed
1.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Multiple mask images ≤37 18 53 14 3.2 1.0
SVG masks ≤37 18 53 14 3.2 1.0

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/mask-image