chromium/third_party/blink/web_tests/fast/selectors/unqualified-hover-quirks.html

<html>
  <head>
    <style type='text/css'>
      :hover { background-color: #666; }
    </style>

    <script type="text/javascript">
      function test()
      {
          if (!window.eventSender)
              return;

          document.body.offsetTop;    // Force layout. The mouse is not tracked before first layout.
          eventSender.mouseMoveTo(16, 16);    // Hover.
          document.body.offsetTop;    // Update layout for hovered state.
      }
    </script>
  </head>
  <body onload="test()">
    <h3>Test of unqualifed :hover selector in quirks parsing mode</h3>

    <p>Moving the mouse anywhere over the document should result no change to the background color.</p>
  </body>
</html>