LayoutTests/fast/text/simple-text-with-line-height.html

<style>
div {
  background-color: green;
  font-family: Ahem;
  font-size: 20px;
  width: 200px;
  color: transparent;
}
</style>
<div style="line-height: 1">some text</div>
<div style="line-height: 2">some text</div>
<div style="line-height: 3">some text<br>some text</div>
<div style="line-height: 0">some text</div>