<span>：内容 span 元素

<p>
  Add the <span class="ingredient">basil</span>,
  <span class="ingredient">pine nuts</span> and
  <span class="ingredient">garlic</span> to a blender and blend into a paste.
</p>

<p>
  Gradually add the <span class="ingredient">olive oil</span> while running the
  blender slowly.
</p>

span.ingredient {
  color: red;
}

<p><span>Some text</span></p>

<li>
  <span>
    <a href="portfolio.html" target="_blank">See my portfolio</a>
  </span>
</li>

li span {
  background: gold;
}