Web/CSS/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 1The definition of 'mask-image' in that specification.	Candidate Recommendation	Initial definition

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
`mask-image`	Chrome Full support 1 Prefixed' Notes' Full support 1 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' 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.	Edge Full support 16	Firefox Full support 53	IE No support No	Opera Full support 15 Prefixed' Full support 15 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Safari Full support 4 Prefixed' Notes' Full support 4 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' Initially, Safari supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.	WebView Android Full support 2 Prefixed' Notes' Full support 2 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' Initially, Android supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.	Chrome Android Full support 18 Prefixed' Notes' Full support 18 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' 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.	Firefox Android Full support 53	Opera Android Full support 14 Prefixed' Full support 14 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Safari iOS Full support 3.2 Prefixed' Notes' Full support 3.2 Prefixed' Notes' Prefixed' Implemented with the vendor prefix: -webkit- Notes' Initially, Safari supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.	Samsung Internet Android Full support 1.0 Prefixed' Full support 1.0 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-
Multiple mask images	Chrome Full support 1	Edge Full support 18	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 4	WebView Android Full support ≤37	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
SVG masks	Chrome Full support 8	Edge Full support 18	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 4	WebView Android Full support ≤37	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
See implementation notes.': See implementation notes.
Requires a vendor prefix or different name for use.': Requires a vendor prefix or different name for use.

mask-image by Mozilla Contributors is licensed under CC-BY-SA 2.5.