:only-of-type

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.

:only-of-type CSS 伪类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。

尝试一下

备注： 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

css
:only-of-type {
  /* ... */
}

示例

为没有同类型兄弟元素的元素设置样式

HTML

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

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

结果

规范

Specification
Selectors Level 4
# only-of-type-pseudo

浏览器兼容性

BCD tables only load in the browser

参见