<html>
<head>
<style type="text/css">
/* This test is really intended for Segoe UI on Windows7;
   we provide a known fallback font for other platforms where
   the default font might not handle the diacritic (WinXP) */
@font-face {
  font-family: fallback;
  src: url(../fonts/DejaVuSansMono.woff);
}
p.test {
  font-family: "Segoe UI", fallback, sans-serif;
  font-size: 60px;
}
span.test {
  background: black;
}
</style>
</head>
<body>
<p>Diacritic should be hidden by the black background:</p>
<p class="test">x<span class="test">x&#x302;</span>x</p>
</body>
</html>