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