形状图像阈值 | shape-image-threshold
该shape-image-threshold CSS属性定义了使用图像作为shape-outside值时，用以提取形状的阿尔法通道（透明度通道）阈值。
值0.5意味着形状将包含所有超过50％不透明度的像素。
/* <number> value */
shape-image-threshold: 0.7;
/* Global values */
shape-image-threshold: inherit;
shape-image-threshold: initial;
shape-image-threshold: unset;Initial value | 0.0 |
|---|---|
Applies to | floats |
Inherited | no |
Media | visual |
Computed value | The same as the specified value after clipping the <number> to the range 0.0, 1.0. |
Animation type | a number |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
语法
可用值
<number>设置用于从图像中提取形状的阈值。形状由alpha值大于阈值的像素定义。超出范围0.0（完全透明）到1.0（完全不透明）的阈值将被限制在此范围内。
形式语法
<number>实例
HTML内容
<div id="gradient-shape"></div>
<p>
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ipsum porro modi, id nemo eligendi, architecto ratione quibusdam iusto
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accusamus iusto dolore, at provident eius alias maxime pariatur non
deleniti ipsum sequi rem eveniet laboriosam magni expedita?
</p>CSS内容
#gradient-shape {
width: 150px;
height: 150px;
float: left;
background-image: linear-gradient(30deg, black, transparent 80%,
transparent);
shape-outside: linear-gradient(30deg, black, transparent 80%,
transparent);
shape-image-threshold: 0.2;
}结果
规范
Specification | Status | Comment |
|---|---|---|
CSS Shapes Module Level 1The definition of 'shape-image-threshold' in that specification. | Candidate Recommendation | Initial definition |
浏览器兼容性
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
Basic support | (Yes) | No support1 | No support | (Yes) | 7.0 -webkit |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
Basic support | (Yes) | No support1 | No support | ? | ? |
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