class="example"

class="example intro"

.example:not(.intro) {
  color: #00b0e0;
}
<p class="example">class="example"</p>
<p class="example intro">class="example intro"</p>
    

.example2:has( > .border ) {
  border: 1px solid #00b0e0;
}
<div class="example2" href="#">
  <div class="border">
    关系伪类:has
  </div>
</div>