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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=665540
+-->
+<head>
+  <title>Test for Bug 665540 Select dropdown position in fullscreen window</title>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body onload="openFullscreenWindow()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=665540">Mozilla Bug 665540</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 665540 **/
+
+SimpleTest.waitForExplicitFinish();
+
+var win;
+var select;
+var optiona;
+var eventType = "mouseover";
+var timeoutID;
+var eventOffsetX = 2;
+var eventOffsetY = 2;
+
+function openFullscreenWindow() {
+    win = open("bug665540_window.xul", "_blank", "resizable=yes,chrome");
+    win.addEventListener("sizemodechange",
+                         function() {
+                           info("sizemodechange. windowState = " + win.windowState + " fullScreen = " + win.fullScreen);
+                         }, false);
+    win.addEventListener("fullscreen",
+                         function() {
+                           info("fullscreen event. windowState = " + win.windowState + " fullScreen = " + win.fullScreen);
+                         }, false);
+    info("win.windowState = " + win.windowState);
+    info("win.fullScreen = " + win.fullScreen);
+
+    // Close our window if the test times out so that it doesn't interfere
+    // with later tests.
+    timeoutID = setTimeout(function () {
+        ok(false, "Test timed out.");
+        // Provide some time for a screenshot
+        setTimeout(finish, 1000);
+    }, 20000);
+}
+
+function childFocused() {
+    ok(win.fullScreen, "window should be fullscreen");
+    is(win.windowState, win.STATE_FULLSCREEN,
+       "window state should be fullscreen");
+
+    // The select doesn't open if the mouse click is fired too soon
+    // (on X11 at least).
+    setTimeout(openSelect, 1000);
+}
+
+function openSelect() {
+    select = win.document.getElementById("select");
+    synthesizeMouseAtCenter(select, {}, win);
+    // A yield was required on X11 tinderbox machines.
+    // (Wasn't required on other platforms nor on an X11 system with kwin.)
+    setTimeout(checkPosition, 1000);
+}
+
+function checkPosition() {
+    optiona = win.document.getElementById("optiona");
+    optiona.addEventListener(eventType, eventReceived, false);
+
+    // If the select dropdown is opened in the position where
+    // getBoundingClientRect() predicts, then optiona will receive the event.
+    // The event is received asynchronously (I don't know why), so the handler
+    // is removed later.
+    synthesizeMouse(optiona, eventOffsetX, eventOffsetY,
+                    { type: eventType }, win);
+}
+
+function eventReceived(event) {
+    clearTimeout(timeoutID);
+    optiona.removeEventListener(eventType, eventReceived, false);
+
+    var rect = optiona.getBoundingClientRect();
+
+    // Note that fullscreen only fully covers one monitor, so win.screenX can
+    // be non-zero.
+    is(event.screenX, win.screenX + rect.left + eventOffsetX,
+       "event.screenX should match sent event");
+    is(event.screenY, win.screenY + rect.top + eventOffsetY,
+       "event.screenY should match sent event");
+
+    finish();
+}
+
+function finish() {
+    if (select && navigator.platform.indexOf("Win") >= 0) {
+        todo(false,
+             "Should not have to close select before closing its window");
+        // This avoids mochitest "Unable to restore focus" errors (bug 670053).
+        synthesizeMouseAtCenter(select, {}, win);
+    }
+
+    is(win.windowState, win.STATE_FULLSCREEN,
+       "window state should still be fullscreen");
+
+    win.close();
+    SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>