形状图像阈值 | shape-image-threshold

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>
  Lorem ipsum dolor sit amet, consectetur adipisicing elit. Vel at commodi 
  voluptates enim, distinctio officia. Saepe optio accusamus doloribus sint 
  facilis itaque ab nulla, dolor molestiae assumenda cum sit placeat 
  adipisci, libero quae nihil porro debitis laboriosam inventore animi 
  impedit nostrum nesciunt quisquam expedita! Dolores consectetur iure atque 
  a mollitia dicta repudiandae illum exercitationem aliquam repellendus 
  ipsum porro modi, id nemo eligendi, architecto ratione quibusdam iusto 
  nisi soluta? Totam inventore ea eum sed velit et eligendi suscipit 
  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	?	?