<svg version="1.1" baseProfile="basic" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
     <g id="reference">
         <rect x="240" y="1" width="239" height="358" />
         <circle cx="240" cy="1" width="39" height="58" />
     </g>

    <script type="text/ecmascript">
    <![CDATA[
      if (window.layoutTestController)
          layoutTestController.waitUntilDone();

      window.setTimeout("clickNow()", 0);

      function clickNow() {
          if (window.eventSender) {
              eventSender.mouseMoveTo(250, 50);
              eventSender.mouseDown();
              eventSender.mouseUp();
          }

          if (window.layoutTestController) {
              layoutTestController.notifyDone();
          }
      }

      function test (event) {
        // get pointers to use and referenced elements
        var container = document.getElementById('reference');
        var rect = container.firstChild.nextSibling;
        var circle = rect.nextSibling.nextSibling;
        var use = document.getElementById('use');

        // test all SVGElementInstance methods (except childNodes) 
        var rectInstance = event.target;
        var gInstance = rectInstance.parentNode;
        var circleInstance = rectInstance.nextSibling;
    
        // Check wheter correspdoningElement is the <rect>, and wheter <use> is set correctly.
        if (rectInstance.correspondingElement != rect) return;
        if (rectInstance.correspondingUseElement != use) return;

        // Our <rect> doesn't have children.
        if (rectInstance.firstChild) return;
        if (rectInstance.lastChild) return;

        // Our <rect> SVGElementInstance has the <g> SVGElementInstance as parent node
        if (!gInstance) return;
        if (gInstance.correspondingElement != container) return;

        // Our <rect> SVGElementInstance has no previous sibling
        if (rectInstance.previousSibling) return;

        // Our <rect> SVGElementInstance has the <circle> SVGElementInstance as next sibling
        if (!circleInstance) return;
        if (circleInstance.correspondingElement != circle) return;
        if (rectInstance.nextSibling != circleInstance) return;

        // Our <g> SVGElementInstance has no parent node, and <rect> as firstChild, <circle> as lastChild
        if (gInstance.parentNode) return;
        if (gInstance.firstChild != rectInstance) return;
        if (gInstance.lastChild != circleInstance) return;

        // Hopefully we pass :-)
        document.getElementById("status").firstChild.nodeValue = "Test passed.";
      }
    ]]>
    </script>
  </defs>

  <text x="100" y="50" id="status">Test failed.</text>
  <use id="use" xlink:href="#reference" onclick="test(evt)" fill="grey" />
  <rect id="test-frame" x="1" y="1" width="478" height="358" fill="none" stroke="#000"/>
</svg>