#1
<div class="page-content">
  <h3 class="page-heading">
    HEADING TEXT
    <small>SUBHEADING TEXT</small>
  </h3>
  ...
</div>

#2
<div class="page-content">
  <header>
    <h3 class="page-heading">
      HEADING TEXT
      <small>SUBHEADING TEXT</small>
    </h3>
  </header>
  ...
</div>

#3
<div class="page-content">
  <header class="page-heading">
    HEADING TEXT
    <small>SUBHEADING TEXT</small>
  </header>
  ...
</div>