isolation

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

isolation CSS 属性决定了元素是否必须创建一个新的层叠上下文。

尝试一下

isolation: auto;

isolation: isolate;

<section class="default-example" id="default-example">
  <div class="background-container">
    <div id="example-element">
      <img src="/shared-assets/images/examples/firefox-logo.svg" />
      <p><code>mix-blend-mode: multiply;</code></p>
    </div>
  </div>
</section>

.background-container {
  background-color: #f4f460;
  width: 250px;
}

#example-element {
  border: 1px solid black;
  margin: 2em;
}

#example-element * {
  mix-blend-mode: multiply;
  color: #8245a3;
}

该属性与 mix-blend-mode 和 z-index 结合使用时尤其有用。

语法

css

/* 关键字值 */
isolation: auto;
isolation: isolate;

/* 全局值 */
isolation: inherit;
isolation: initial;
isolation: revert;
isolation: revert-layer;
isolation: unset;

isolation 属性指定为下列关键字值之一。

值

auto: 只有当应用于元素的某个属性需要时，才会创建一个新的层叠上下文。
isolate: 必须创建新的层叠上下文。

形式定义

初始值	`auto`
适用元素	All elements. In SVG, it applies to container elements, graphics elements, and graphics referencing elements.
是否是继承属性	否
计算值	as specified
动画类型	Not animatable

形式语法

isolation = 
  <isolation-mode>  

<isolation-mode> = 
  auto     |
  isolate

示例

强制为元素创建新的层叠上下文

HTML

html

<div class="big-square ">
  <div class="isolation-auto">
    <div class="small-square">auto</div>
  </div>
  <div class="isolation-isolate">
    <div class="small-square">isolate</div>
  </div>
</div>

CSS

css

.isolation-auto {
  isolation: auto;
}

.isolation-isolate {
  isolation: isolate;
}

.big-square {
  background-color: rgb(0, 255, 0);
  width: 200px;
  height: 210px;
}

.small-square {
  background-color: rgb(0, 255, 0);
  width: 100px;
  height: 100px;
  border: 1px solid black;
  padding: 2px;
  mix-blend-mode: difference;
}

结果

规范

Specification
Compositing and Blending Level 2 # isolation