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+<!DOCTYPE HTML>
+<html lang="zh-cn">
+<head>
+<meta charset="utf-8">
+<title>Testcase, bug 1136557</title>
+<style>
+.a { font: 12px serif }
+.b { font: 12.25px serif }
+.c { font: 12.5px serif }
+.d { font: 12.75px serif }
+.e { font: 12px sans-serif }
+.f { font: 12.25px sans-serif }
+.g { font: 12.5px sans-serif }
+.h { font: 12.75px sans-serif }
+.i { font: 12px monospace }
+.j { font: 12.25px monospace }
+.k { font: 12.5px monospace }
+.l { font: 12.75px monospace }
+</style>
+</head>
+<body>
+<div style="writing-mode:vertical-lr">
+<p class="a">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="b">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="c">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="d">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="e">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="f">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="g">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="h">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="i">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="j">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="k">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+<p class="l">xy<span><span><span><span><span><span><span><span><span><span>zzy</p>
+</div>
+</body>
+</html>