fast/runin/generated4.html

<style>
.hasRunIn:before {
  content: "FAIL";
  display: run-in;
  color: red;
}
</style>

<ul class="hasRunIn">
  <li>x</li>
</ul>

<div>
  <div class="hasRunIn">
    <p>x</p>
  </div>
</div>

<script>
// Force layout.
document.body.clientHeight;

// This is not a Live Collection, so it is safe to iterate.
var elems = document.querySelectorAll('.hasRunIn');
for (var i=0; i<elems.length; ++i)
  elems[i].className = '';
</script>