<!DOCTYPE html>
<body>
  <section>
    <div>1</div>
    <span>2</span>
    <div class="before">3</div>
  </section>
  <section>
    <span>2</span>
    <div class="before">3</div>
    <div>4</div>
  </section>
  <section style="columns: 1">
    <div>1</div>
    <span>2</span>
    <div class="before">3</div>
  </section>
</body>
