th.js"></script>
<body onload="checkLayout('.target')">

<!-- Base case, block layout no shift. -->
<div class="scroller">
  <div class="filler"><div class="anchor"></div></div>
  <div class="target" data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="200"></div>
</div>

<!-- Block layout with relative shift. -->
<div class="scroller">
  <div class="filler relative"><div class="anchor"></div></div>
  <div class="target" data-offset-x="0" data-offset-y="0" data-expected-width=