<html>
<head>
 <title>Check default sans-serif font</title>
 <style>
 p.sans {
  font-family: sans-serif;
  }
 p.aria {
  font-family: Arial, sans-serif;
  }
 p.sego {
  font-family: Segoe UI, sans-serif;
  }
 </style>
</head>
<body>
 <p class="sans">This is plain non-specified sans-serif.</p>
 <p class="aria">This paragraph is specified as Arial.</p>
 <p class="sego">This paragraph is specified as Segoe UI.</p>
</body>