记录一个data-text的使用

    <ul>
      <li>
        <a href="#" data-text="home">home</a>
      </li>
      <li>
        <a href="#" data-text="about">about</a>
      </li>
      <li>
        <a href="#" data-text="services">services</a>
      </li>
      <li>
        <a href="#" data-text="team">team</a>
      </li>
      <li>
        <a href="#" data-text="contact">contact</a>
      </li>
    </ul>

a:before {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  color: #262626;
  padding: 5px 0;
  clip-path: polygon(0 0, 100% 0%, 100% 50%, 0 50%);
}

a:after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  color: #262626;
  padding: 5px 0;
  clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
}

用于在css在html中获取值，例如用于伪元素中。