:first-of-type

CSS 伪类 :first-of-type表示一组兄弟元素中其类型的第一个元素。

/* 选择在父元素中第一个出现的<p>，而不管其在兄弟内的位置如何 */
p:first-of-type {
  color: red;
}

:first-of-type

HTML

<h2>Heading</h2>
<p>Paragraph 1</p>
<p>Paragraph 1</p>

CSS

p:first-of-type {
  color: red;
  font-style: italic;
}

结果

下面这个例子展示了如何选中多层嵌套元素。注意当不存在简单选择器时，通配符(*)是默认应用的。 

HTML

<article>
  <div>This `div` is first!</div>
  <div>This <span>nested `span` is first</span>!</div>
  <div>This <em>nested `em` is first</em>, but this <em>nested `em` is last</em>!</div>
  <div>This <span>nested `span` gets styled</span>!</div>
  <b>This `b` qualifies!</b>
  <div>This is the final `div`.</div>
</article>

CSS

article :first-of-type {
  background-color: pink;
}

结果

• :first-child, :last-of-type, :nth-of-type