The mask
CSS property hides an element (partially or fully) by masking or clipping the image at specific points.
/* Keyword values */ mask: none; /* Image values */ mask: url(mask.png); /* Pixel image used as mask */ mask: url(masks.svg#star); /* Element within SVG graphic used as mask */ /* Combined values */ mask: url(masks.svg#star) luminance; /* Element within SVG graphic used as luminance mask */ mask: url(masks.svg#star) 40px 20px; /* Element within SVG graphic used as mask positioned 40px from the top and 20px from the left */ mask: url(masks.svg#star) 0 0/50px 50px; /* Element within SVG graphic used as mask with a width and height of 50px */ mask: url(masks.svg#star) repeat-x; /* Element within SVG graphic used as horizontally repeated mask */ mask: url(masks.svg#star) stroke-box; /* Element within SVG graphic used as mask extending to the box enclosed by the stroke */ mask: url(masks.svg#star) exclude; /* Element within SVG graphic used as mask and combined with background using non-overlapping parts */ /* Global values */ mask: inherit; mask: initial; mask: unset;
The mask
shorthand also resets mask-border
to its initial value. It is therefore recommended to use the mask
shorthand rather than other shorthands or the individual properties to override any mask settings earlier in the cascade. This will ensure that mask-border
has also been reset to allow the new styles to take effect.
Initial value | as each of the properties of the shorthand:
|
---|---|
Applies to | all elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements |
Inherited | no |
Percentages | as each of the properties of the shorthand:
|
Media | visual |
Computed value | as each of the properties of the shorthand:
|
Animation type | as each of the properties of the shorthand:
|
Canonical order | per grammar |
Creates stacking context | yes |
<mask-reference>
mask-image
.<masking-mode>
mask-mode
.<position>
mask-position
.<bg-size>
mask-size
.<repeat-style>
mask-repeat
.<geometry-box>
<geometry-box>
value is given, it sets both mask-origin
and mask-clip
. If two <geometry-box>
values are present, then the first sets mask-origin
and the second sets mask-clip
.<geometry-box> | no-clip
mask-clip
.<compositing-operator>
mask-composite
.<mask-layer>#where
<mask-layer> = <mask-reference> || <position> [ / <bg-size> ]? || <repeat-style> || <geometry-box> || [ <geometry-box> | no-clip ] || <compositing-operator> || <masking-mode>where
<mask-reference> = none | <image> | <mask-source>
<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> ] ]
<bg-size> = [ <length-percentage> | auto ]{1,2} | cover | contain
<repeat-style> = repeat-x | repeat-y | [ repeat | space | round | no-repeat ]{1,2}
<geometry-box> = <shape-box> | fill-box | stroke-box | view-box
<compositing-operator> = add | subtract | intersect | exclude
<masking-mode> = alpha | luminance | match-sourcewhere
<image> = <url> | <image()> | <image-set()> | <element()> | <cross-fade()> | <gradient>
<mask-source> = <url>
<length-percentage> = <length> | <percentage>
<shape-box> = <box> | margin-boxwhere
<image()> = image( [ [ <image> | <string> ]? , <color>? ]! )
<image-set()> = image-set( <image-set-option># )
<element()> = element( <id-selector> )
<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )
<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()>
<box> = border-box | padding-box | content-boxwhere
<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> )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> = <color-stop>#{2,}
<ending-shape> = circle | ellipse
<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}where
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<color-stop> = <color> <length-percentage>?
.target { mask: url(#c1) luminance; } .anothertarget { mask: url(resources.svg#c1) 50px 30px/10px 10px repeat-x exclude; }
Specification | Status | Comment |
---|---|---|
CSS Masking Module Level 1 The definition of 'mask' in that specification. | Candidate Recommendation | Extends its usage to HTML elements. Extends its syntax by making it a shorthand for the new mask-* properties defined in that specification. |
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'mask' in that specification. | Recommendation | Initial definition. |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1
|
12 | Yes
|
No | Partial
|
4
|
Applies to HTML elements | Yes
|
? | 3.5 | No | Yes
|
No |
Shorthand for mask-* properties |
Yes
|
? | 53 | No | Yes
|
No |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | 2
|
? | Yes | Yes | ? | 3.2
|
? |
Applies to HTML elements | ? | ? | ? | ? | ? | ? | ? |
Shorthand for mask-* properties |
? | ? | ? | 53 | ? | ? | ? |
clip-path
, filter
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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