<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS test reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
  line-height: 1;
  color: transparent;
  background: green;
  float: left;
  clear: left;
}
</style>

<p>Test passes if the shape below is green and if there is no red.

<div>ああああ あ あ</div>
<div>ああ</div>