<h3 class="heading hide-type">
  <span class="type">Exercises</span> <span class="codenumber"></span>
  <span class="title">Exercises</span>
</h3>
<article class="exercise exercise-like" id="exercise-1">
  <h3 class="heading">
    <span class="codenumber">1<span class="period">.</span></span>
  </h3>
  <div class="para" id="p-1">
    Compute <span class="process-math">\(\int 3x^2\,dx\text{.}\)</span>
  </div>
</article>
