<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CSS test reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
<style>
div {
  display: inline-block;
  height: 5px;
  background: blue;
  width: 50px;
  color: transparent;
  font-size: 100px;
}
</style>

<p>Test passes if there are two, not one, blue lines below.</p>
<div></div><div>a</div>