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:only-of-type - CSS（层叠样式表）编辑

概述

CSS 伪类 :only-of-type 代表了任意一个元素，这个元素没有其他相同类型的兄弟元素。

Note: 根据原来的定义，被选择的元素必须具有父元素。直到 Selectors Level 4 开始，这个要求就不是必须的了。

语法

element:only-of-type { style properties }

Example

HTML

<main>
  <div>I am `div` #1.</div>
  <p>I am the only `p` among my siblings.</p>
  <div>I am `div` #2.</div>
  <div>I am `div` #3.
    <i>I am the only `i` child.</i>
    <em>I am `em` #1.</em>
    <em>I am `em` #2.</em>
  </div>
</main>

CSS

main :only-of-type {
  color: red;
}

结果

规范

Specification	Status	Comment
Selectors Level 4 :only-of-type	Working Draft	No change.
Selectors Level 3 :only-of-type	Recommendation	Initial definition.

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!