diff -r 000000000000 -r 4f2f89ce4247 WebCore/manual-tests/nested-plug-ins.html
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/manual-tests/nested-plug-ins.html	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,45 @@
+<script>
+    function toggleDisplay(element, button)
+    {
+        if (element.style.display == "none")
+            element.style.display = "";
+        else
+            element.style.display = "none";
+    }
+
+    function toggleVisibility(element, button)
+    {
+        if (element.style.visibility == "hidden")
+            element.style.visibility = "";
+        else
+            element.style.visibility = "hidden";
+    }
+
+</script>
+<p>
+    Play with the display and visibility toggles. Make sure that turning an inner element visible does not show it if it has a hidden or
+       non-displaying ancestor, and that making an ancestor visible and displaying shows only its descendants the are visible and displaying.
+</p>
+<table>
+    <tr>
+        <td>
+            <input type="checkbox" checked="true" onclick="toggleDisplay(document.getElementById('middle'))"> Outer frame display
+        </td>
+        <td>
+            <input type="checkbox" checked="true" onclick="toggleDisplay(document.getElementById('middle').contentDocument.getElementById('inner'))"> Inner frame display
+        </td>
+    </tr>
+    <tr>
+        <td>
+            <input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle'))"> Outer frame visibility
+            </td>
+        <td>
+            <input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle').contentDocument.getElementById('inner'))"> Inner frame visibility
+        </td>
+        <td>
+            <input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle').contentDocument.getElementById('inner').contentDocument.getElementById('plugin'))"> Inner plug-in visibility
+        </td>
+    </tr>
+</table>
+
+<iframe id="middle" style="height: 400px; width: 400px;" src="resources/nested-plug-ins-outer-frame.html"></iframe>