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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
概要
mask-image CSS属性用于设置元素上遮罩层的图像。
| 初始值 | none |
|---|---|
| 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 |
| 适用媒体 | visual |
| 计算值 | as specified, but with URIs made absolute |
| Animation type | discrete |
| 正规顺序 | the unique non-ambiguous order defined by the formal grammar |
语法
/* 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;
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 syntax
<mask-reference>#where
<mask-reference> = none | <image> | <mask-source>where
<image> = <url> | <image()> | <image-set()> | <element()> | <cross-fade()> | <gradient>
<mask-source> = <url>where
<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()>where
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
<image-set-option> = [ <image> | <string> ] <resolution>
<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( <rgb-component>#{3} )
<rgba()> = rgba( <rgb-component>#{3} , <alpha-value> )
<hsl()> = hsl( <hue>, <percentage>, <percentage> )
<hsla()> = hsla( <hue>, <percentage>, <percentage>, <alpha-value> )
<named-color> = <ident>
<deprecated-system-color> = ActiveBorder | ActiveCaption | AppWorkspace | Background | ButtonFace | ButtonHighlight | ButtonShadow | ButtonText | CaptionText | GrayText | Highlight | HighlightText | InactiveBorder | InactiveCaption | InactiveCaptionText | InfoBackground | InfoText | Menu | MenuText | Scrollbar | ThreeDDarkShadow | ThreeDFace | ThreeDHighlight | ThreeDLightShadow | ThreeDShadow | Window | WindowFrame | WindowText
<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}
<position> = [[ left | center | right | top | bottom | <length-percentage> ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] | [ center | [ left | right ] <length-percentage>? ] && [ center | [ top | bottom ] <length-percentage>? ]]where
<rgb-component> = <integer> | <percentage>
<alpha-value> = <number>
<hue> = <number>
<color-stop> = <color> <length-percentage>?
<length-percentage> = <length> | <percentage>
例子
CSS内容
#masked {
width: 100px;
height: 100px;
background-color: #8cffa0;
mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
}
HTML内容
<div id="masked"></div>
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Masking Level 1 mask-image |
Candidate Recommendation | Initial definition |
浏览器兼容性
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Edge | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 1.0-webkit[1] | 未实现[2] | 未实现 | ? | (Yes)-webkit | 4.0-webkit[3] |
| Multiple mask images | 1.0-webkit | 未实现[2] | 未实现 | ? | (Yes)-webkit | 4.0-webkit |
| SVG masks | 8.0 | 未实现[2] | 未实现 | ? | (Yes)-webkit | 4.0-webkit |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | 2.1-webkit[4] | 未实现[2] | ? | 未实现 | 3.2-webkit[5] |
| Multiple mask images | (Yes)-webkit | 未实现[2] | ? | 未实现 | (Yes)-webkit |
| SVG masks | (Yes)-webkit | 未实现[2] | ? | 未实现 | (Yes)-webkit |
[1] Implemented in version 8.0, Chrome initially only supported the -webkit prefixed versions of gradients as values. Later, support for the unprefixed versions was added.
[2] This feature is not implemented yet. It is only available in Nightly and Dev Edition. See bug 1251161.
[3] Implemented in version 4.0, Safari initially only supported the -webkit prefixed versions of gradients as values.
[4] Android initially only supported the -webkit prefixed versions of gradients as values.
[5] iOS Safari initially only supported the -webkit prefixed versions of gradients as values.