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CSS 属性 mask
允许使用者通过部分或者完全隐藏一个元素的可见区域。这种效果可以通过遮罩或者裁切特定区域的图片。
/* Keyword values */ mask: none; /* Image values */ mask: url(mask.png); /* 使用位图来做遮罩 */ mask: url(masks.svg#star); /* 使用 SVG 图形中的形状来做遮罩 */ /* Combined values */ mask: url(masks.svg#star) luminance; /* Element within SVG graphic used as luminance mask */ mask: url(masks.svg#star) 40px 20px; /* 使用 SVG 图形中的形状来做遮罩并设定它的位置:离上边缘40px,离左边缘20px */ mask: url(masks.svg#star) 0 0/50px 50px; /* 使用 SVG 图形中的形状来做遮罩并设定它的位置和大小:长宽都是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;
mask的简写会将 mask-border
设为初始值。使用 mask
的简写优于使用其他简写或者各自属性的设置来覆盖。这能保证 mask-border
也会重新设置为新的效果样式。
初始值 | as each of the properties of the shorthand:
|
---|---|
适用元素 | all elements; In SVG, it applies to container elements excluding the defs element and all graphics elements |
是否是继承属性 | 否 |
Percentages | as each of the properties of the shorthand:
|
适用媒体 | visual |
计算值 | as each of the properties of the shorthand:
|
Animation type | as each of the properties of the shorthand:
|
正规顺序 | per grammar |
Creates stacking context | yes |
Syntax
Values
<mask-reference>
- 设置遮罩图片的路径。详见
mask-image
。 <masking-mode>
- 设置遮罩图片的模式。详见
mask-mode
。 <position>
- 设置遮罩图片的位置。详见
mask-position
。 <bg-size>
- 设置遮罩的大小。详见
mask-size
。 <repeat-style>
- 设置遮罩图片的重复性。详见
mask-repeat
。 <geometry-box>
- 如果只有一个 <geometry-box> 值被赋予,他将会设置
mask-origin
和mask-clip
。如果两个 <geometry-box> 值显示,第一个值代表mask-origin
第二个值代表mask-clip
。 <geometry-box> | no-clip
- 设置区域,会被遮罩图片影响。详见
mask-clip
。 <compositing-operator>
- 设置遮罩图层的组合操作。详见
mask-composite
。
正式语法
<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()> | <paint()> | <cross-fade()> | <gradient>
<mask-source> = <url>
<length-percentage> = <length> | <percentage>
<shape-box> = <box> | margin-boxwhere
<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()>
<box> = border-box | padding-box | content-boxwhere
| rtl
= ltr
<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}
<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>
<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>
例子
.target { mask: url(#c1) luminance; } .anothertarget { mask: url(resources.svg#c1) 50px 30px/10px 10px repeat-x exclude; }
规范
规范 | 状态 | 备注 |
---|---|---|
CSS Masking Module Level 1 mask |
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) mask |
Recommendation | Initial definition |
浏览器兼容性
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
mask | Chrome
Partial support
1
| Edge Full support 12 | Firefox
Full support
2
| IE No support No | Opera
Partial support
15
| Safari
Partial support
3.2
| WebView Android
Partial support
2
| Chrome Android
Partial support
18
| Firefox Android
Full support
4
| Opera Android
Partial support
14
| Safari iOS
Partial support
3.2
| Samsung Internet Android
Partial support
Partial
|
Legend
- Full support
- Full support
- Partial support
- Partial 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.