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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
+        "http://www.w3.org/TR/html4/strict.dtd">
+<html lang="en">
+<head>
+</head>
+<body>
+<p><b>BUG ID:</b> <a href="rdar://problem/5523503">rdar://problem/5523503</a> Safari crashes clicking scroll bar in FaceBook 'Trips'</p>
+
+<p id="test" style="background-color:skyblue; padding:3px;"><b>STEPS TO TEST:</b> 
+Drag the scroll thumb in each of the vertical scrollbars below.
+</p>
+
+<p id="success" style="background-color:palegreen; padding:3px;"><b>TEST PASS:</b> 
+Each scrollbar will disappear when clicked, along with the box containing it, but the browser will not crash as you continue to drag.
+</p>
+
+<p id="failure" style="background-color:#FF3300; padding:3px;"><b>TEST FAIL:</b>  
+The scrollbar will disappear and Safari will crash as you continue dragging.
+</p>
+
+<div style="height: 120px;">
+    <div id="overflow" style="overflow: auto; height: 100px; width: 100px; background-color: lightblue;">
+        <div style="height: 200px;"></div>
+    </div>
+</div>
+<div>
+    <select multiple="true" id="listbox" style="height: 100px; width: 100px;">
+        <option>One</option>
+        <option>Two</option>
+        <option>Three</option>
+        <option>Four</option>
+        <option>Five</option>
+        <option>Six</option>
+        <option>Seven</option>
+        <option>Eight</option>
+        <option>Nine</option>
+        <option>Ten</option>
+    </select>
+</div>
+<script>
+    var overflow = document.getElementById("overflow");
+    var listbox = document.getElementById("listbox");
+
+    function mousedown(event)
+    {
+        if (event.target.id)
+            setTimeout(event.target.id + '.style.display = "none"', 0);
+    }
+
+    overflow.addEventListener("mousedown", mousedown, false);
+    listbox.addEventListener("mousedown", mousedown, false);
+</script>
+</body>
+</html>