mozilla-release/layout/reftests/line-breaking/surrogates-1-ref.html

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>Bug xxxx</title>
<style>
.bmp {
  color: green;
}
.supp {
  color: blue;
}
</style>
</head>
<body>
Line-breaking in the green (BMP) and blue (supplementary-plane) examples should match.
<p class="bmp">abcdef<br>&#x2018;&#x6587;&#x2019;<br>abcdef</p>
<p class="supp">abcdef<br>&#x2018;&#x2000B;&#x2019;<br>abcdef</p>
</body>
</html>