LayoutTests/fast/text/layout-overflow-hidden-for-line-clamped-content.html

<style>
.clamped {
  font-family: Ahem;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  overflow: hidden;
}
</style>
<!-- PASS if a single line of TEST with ellipses -->
<div class="clamped">TEST<br />CASE<br /><div></div>FAIL</div>