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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Bug 1055658 - Relative positioning for ruby</title>
+  <link rel="stylesheet" href="common.css">
+  <style>
+    body {
+      line-height: 80px;
+    }
+    rtc, rt {
+      font-size: 100% !important;
+      line-height: 1 !important;
+    }
+  </style>
+</head>
+<body>
+  <ruby style="position: relative;">
+    <rb>base</rb>
+    <rtc><rt>a<span style="position: relative; top: -10px;">b</span>c</rt></rtc>
+    <rtc><div style="width: 50px; height: 0;"></div></rtc>
+  </ruby>
+</body>
+</html>