<html>
<body style="width: 5000px; height: 5000px">
<p>This is a test for bug <a href="https://bugs.webkit.org/show_bug.cgi?id=122859">122859</a>.
Scrolling with the mouse wheel over the horizontal main scrollbar should scroll the view horizontally</p>
<script>
  document.scrollingElement.scrollLeft = 40;
</script>
</body>
</html>