es in each group should line up with each other at end of each
iteration (or start if reversed).</div>
<div>Right edge of each box should align with black line at end of test.</div>

<div class="animContainer" id="ca">
  <div class="expected" style="width: 280px;"><div class="anim a" id="a"></div></div>
  <div class="expected" style="width: 280px;"><div class="anim b" id="b"></div></div>
  <div class="expected" style="width: 280px;"><div class="anim c" id="c"></div></div>
</div>

<div class="animContainer" 