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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

descendant combinator — typically represented by a single space ( ) character — combines two selectors such that elements matched by the second selector are selected if they have an ancestor (parent, parent's parent, parent's parent's parent, etc) element matching the first selector. Selectors that utilize a descendant combinator are called descendant selectors .

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

The descendant combinator is technically one or more CSS white space characters — the space character and/or one of four control characters: carriage return, form feed, new line, and tab characters — between two selectors in the absence of another combinator. Additionally, the white space characters of which the combinator is comprised may contain any number of CSS comments.

句法

selector1 selector2 {
  /* property declarations */
}
					

范例

CSS

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

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>
					

结果

规范

规范	状态	注释
Selectors Level 4 The definition of 'descendant combinator' in that specification.	工作草案
Selectors Level 3 The definition of 'descendant combinator' in that specification.	推荐
CSS Level 2 (Revision 1) The definition of 'descendant selectors' in that specification.	推荐
CSS Level 1 The definition of 'contextual selectors' in that specification.	推荐	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
Descendant combinator ( A B )	Chrome 完整支持 1 完整支持 1 完整支持 61 注意事项 注意事项 >>> is aliased to this selector since its use as the 'shadow-piercing descendant combinator' was deprecated .	Edge 完整支持 12	Firefox 完整支持 1	IE 完整支持 3	Opera 完整支持 3.5	Safari 完整支持 1	WebView Android 完整支持 ≤37 完整支持 ≤37 完整支持 61 注意事项 注意事项 >>> is aliased to this selector since its use as the 'shadow-piercing descendant combinator' was deprecated .	Chrome Android 完整支持 18 完整支持 18 完整支持 61 注意事项 注意事项 >>> is aliased to this selector since its use as the 'shadow-piercing descendant combinator' was deprecated .	Firefox Android 完整支持 4	Opera Android 完整支持 10.1	Safari iOS 完整支持 1	Samsung Internet Android 完整支持 1.0 完整支持 1.0 完整支持 8.0 注意事项 注意事项 >>> is aliased to this selector since its use as the 'shadow-piercing descendant combinator' was deprecated .
A >> B syntax 弃用	Chrome 不支持 No	Edge 不支持 No	Firefox 不支持 No	IE 不支持 No	Opera 不支持 No	Safari 不支持 10 — 11.1	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 不支持 No	Opera Android 不支持 No	Safari iOS 不支持 10 — 11.3	Samsung Internet Android 不支持 No

图例

完整支持

完整支持

不支持

不支持

弃用。不要用于新网站。

弃用。不要用于新网站。

见实现注意事项。

见实现注意事项。

另请参阅

• Child combinator

元数据

• 最后修改： Jul 27, 2020

相关话题

1. CSS
2. CSS 参考
3. CSS Selectors
4. 指南

   1. Using the :target pseudo-class in selectors
5. 特性

   1. 选择器列表
6. Basic Selectors

   1. Type selectors
   2. Class selectors
   3. ID selectors
   4. Universal selectors
   5. Attribute selectors
7. 组合器

   1. Adjacent sibling combinator
   2. General sibling combinator
   3. Child combinator
   4. Descendant combinator
   5. Column combinator
8. Pseudo-classes

   1. :active
   2. :any-link
   3. :checked
   4. :blank
   5. :default
   6. :defined
   7. :dir()
   8. :disabled
   9. :empty
   10. :enabled
   11. :first
   12. :first-child
   13. :first-of-type
   14. :fullscreen
   15. :focus
   16. :focus-visible
   17. :focus-within
   18. :has()
   19. :host()
   20. :host-context()
   21. :hover
   22. :indeterminate
   23. :in-range
   24. :invalid
   25. :is() (:matches(), :any())
   26. :lang()
   27. :last-child
   28. :last-of-type
   29. :left
   30. :link
   31. :not()
   32. :nth-child()
   33. :nth-last-child()
   34. :nth-last-of-type()
   35. :nth-of-type()
   36. :only-child
   37. :only-of-type
   38. :optional
   39. :out-of-range
   40. :placeholder-shown
   41. :read-only
   42. :read-write
   43. :required
   44. :right
   45. :root
   46. :scope
   47. :target
   48. :valid
   49. :visited
   50. :where()
9. Pseudo-elements

   1. ::-moz-progress-bar
   2. ::-moz-range-progress
   3. ::-moz-range-thumb
   4. ::-moz-range-track
   5. ::-webkit-progress-bar
   6. ::-webkit-progress-value
   7. ::-webkit-slider-runnable-track
   8. ::-webkit-slider-thumb
   9. ::after (:after)
   10. ::backdrop
   11. ::before (:before)
   12. ::cue
   13. ::cue-region
   14. ::first-letter (:first-letter)
   15. ::first-line (:first-line)
   16. ::grammar-error
   17. ::marker
   18. ::part()
   19. ::placeholder
   20. ::selection
   21. ::slotted()
   22. ::spelling-error