面具位置 | mask-position (Masking) - CSS 中文开发手册
这是一种实验技术
由于本技术规范未稳定，请检查各种浏览器使用的兼容性表。还要注意，随着规范的改变，实验技术的语法和行为也会随着浏览器未来版本的变化而变化。
mask-positionCSS属性相对于mask-origin对于每个定义的掩码图像设置初始位置。
/* Keyword values */ mask-position: top; mask-position: bottom; mask-position: left; mask-position: right; mask-position: center; /* values */ mask-position: 25% 75%; /* values */ mask-position: 0px 0px; mask-position: 1cm 2cm; mask-position: 10ch 8em; /* Multiple values */ mask-position: 0px 0px, center; /* Global values */ mask-position: inherit; mask-position: initial; mask-position: unset;
| Initial value | 0% 0% |
|---|---|
| Applies to | all elements; In SVG, it applies to container elements excluding the <defs> element and all graphics elements |
| Inherited | no |
| Percentages | refer to size of mask painting area minus size of mask layer image (see the text for background-position) |
| Media | visual |
| Computed value | Consists of two keywords representing the origin and two offsets from that origin, each given as an absolute length (if given a <length>), otherwise as a percentage. |
| Animation type | repeatable list of simple list of length, percentage, or calc |
| Canonical order | the unique non-ambiguous order defined by the formal grammar |
语法
一个或多个<position>值，用逗号分隔。
值
<position>
这是用一个到四个值表示关于元素的框的边缘的二维位置的一个<position>，它可以给出相对或绝对偏移量。请注意，位置可以设置在元素的框外。
形式语法
<position>#where <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 <length-percentage> = <length> | <percentage>
例
CSS
#wrapper {
border: 1px solid black;
250px;
height: 250px;
}
#masked {
250px;
height: 250px;
background: blue linear-gradient(red, blue);
mask-image: url(https://mdn.mozillademos.org/files/12676/star.svg);
mask-repeat: no-repeat;
mask-position: top right; /* Can be changed in the live sample */
margin-bottom: 10px;
} 规格
| Specification | Status | Comment |
|---|---|---|
| CSS Masking Module Level 1The definition of 'mask-position' in that specification. | Candidate Recommendation | Initial definition |
浏览器兼容性
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 1.0-webkit | 53.0 (53.0) | ? | ? | 4.0-webkit |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | ? | 53.0 (53.0) | ? | ? | ? |