CodePen Embed - css :is() pseudo class selector :hover

<article>
  <h1>一级标题</h1>
  <p>一些内容</p>
  <h2>二级标题</h2>
  <p>一些内容</p>
  <h3>三级标题</h3>
  <p>一些内容</p>
  <h4>四级标题</h4>
  <p>一些内容</p>
  <h5>五级标题</h5>
  <p>一些内容</p>
  <h6>六级标题</h5>
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</article>

/* h1:hover::after, h2:hover::after, h3:hover::after, h4:hover::after, h5:hover::after, h6:hover::after {
  content: "#"
} */

:is(h1, h2, h3, h4, h5, h6):hover::after {
  content: "#";
}

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