后代选择器

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

后代组合器(通常用单个空格(" ")字符表示)组合了两个选择器,如果第二个选择器匹配的元素具有与第一个选择器匹配的祖先(父母,父母的父母,父母的父母的父母等)元素,则它们将被选择。利用后代组合器的选择器称为后代选择器

css
/* List items that are descendants of the "my-things" list */
ul.my-things li {
  margin: 2em;
}

从技术上讲,后代组合器是两个选择器之间的一个或多个 CSS 空格字符——空格字符和/或四个控制字符之一:回车、换页、换行和制表符在没有其他组合器的情况下。此外,组成组合器的空白字符可以包含任意数量的 CSS 注释。

语法

selector1 selector2 {
  /* property declarations */
}

Examples

CSS

css
li {
  list-style-type: disc;
}

li li {
  list-style-type: circle;
}

HTML

html
<ul>
  <li>
    <div>Item 1</div>
    <ul>
      <li>Subitem A</li>
      <li>Subitem B</li>
    </ul>
  </li>
  <li>
    <div>Item 2</div>
    <ul>
      <li>Subitem A</li>
      <li>Subitem B</li>
    </ul>
  </li>
</ul>

Result

规范

Specification
Selectors Level 4
# descendant-combinators

浏览器兼容性

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Descendant combinator (A B)

Legend

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Full support
Full support

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