<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
  white-space: pre;
  font-family: monospace;
}
</style>

<p>Test passes if the 4 letters bellow are vertically aligned.
<div>        P</div>
<div>        A</div>
<div>        S</div>
<div>        S</div>