mozilla-release/layout/reftests/css-ruby/line-height-3.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Bug 1069519 - Ruby line height calculation</title>
  <link rel="stylesheet" href="common.css">
</head>
<body style="line-height: 1">
  <ruby>
    <rb>base</rb>
    <rtc style="ruby-position: over; font-size: 80%;"><rt style="color: transparent">text</rt></rtc>
    <rtc style="ruby-position: under; font-size: 50%;"><rt style="color: transparent">text</rt></rtc>
  </ruby><br>
  next line
</body>
</html>