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 valuenone
Applies toall elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inheritedno
Computed valueas specified, but with url() values made absolute
Animation typediscrete

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 compatibility

BCD tables only load in the browser

See also