LayoutTests/fast/block/dynamic-line-clamp-empty-content-expected.html

<style>
#clamp {
  width: 100px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: block-axis;
  -webkit-line-clamp: 2;
}
</style>
<div id=clamp>This text should stay visible after setting line clamp on it.</div>