<!DOCTYPE html>
<html>
<head>
<style>
  body {
    width: 1000px;
    height: 800px;
  }
</style>
<script>
  if (window.internals)
    window.internals.setPageScaleFactor(0.5, 0, 0);
</script>
</head>
<body>
  On success, the blue reference box should be invisible (covered by the fixed box).
</body>
</html>