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

<style>
div {
  background-color: green;
  color: transparent;
  font-family: Ahem;
  font-size: 20px;  
}
</style>
<div>
first<br>
second<br>
third<br>
fourth<br>
fifth<br>
</div>