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diff --git a/widget/tests/test_bug760802.xhtml b/widget/tests/test_bug760802.xhtml
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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=760802
+-->
+<window title="Mozilla Bug 760802"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=760802"
+ target="_blank">Mozilla Bug 760802</a>
+ <p id="display"></p>
+ <div id="content" style="display: none"/>
+ <iframe id="iframe_not_editable" width="300" height="150"
+ src="data:text/html,&lt;html&gt;&lt;body&gt;&lt;/body&gt;&lt;/html&gt;"/><br/>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript"><![CDATA[
+SimpleTest.waitForExplicitFinish();
+
+function getBaseWindowInterface(win) {
+ return win.docShell
+ .treeOwner
+ .nsIBaseWindow;
+}
+
+function getBaseWindowInterfaceFromDocShell(win) {
+ return win.docShell.QueryInterface(Ci.nsIBaseWindow);
+}
+
+function shouldThrowException(fun, exception) {
+ try {
+ fun.call();
+ return false;
+ } catch (e) {
+ // eslint-disable-next-line no-unsanitized/property
+ $("display").innerHTML += "<br/>OK thrown: "+e.message;
+ return (e instanceof Components.Exception &&
+ e.result === exception)
+ }
+}
+function doesntThrowException(fun) {
+ return !shouldThrowException(fun);
+}
+
+var baseWindow = getBaseWindowInterface(this);
+var nativeHandle = baseWindow.nativeHandle;
+// eslint-disable-next-line no-unsanitized/property
+$("display").innerHTML = "found nativeHandle for this window: "+nativeHandle;
+
+var win = Services.wm.getMostRecentWindow("navigator:browser");
+let docShell = getBaseWindowInterfaceFromDocShell(win);
+
+ok(
+ shouldThrowException(function(){docShell.nativeHandle;},
+ Cr.NS_ERROR_NOT_IMPLEMENTED),
+ "nativeHandle should not be implemented for nsDocShell"
+);
+
+ok(typeof(nativeHandle) === "string", "nativeHandle should be a string");
+ok(nativeHandle.match(/^0x[0-9a-f]+$/), "nativeHandle should have a memory address format");
+
+var iWin = document.getElementById("iframe_not_editable").contentWindow;
+is(getBaseWindowInterface(iWin).nativeHandle, nativeHandle,
+ "the nativeHandle of an iframe should be its parent's nativeHandle");
+
+var dialog = win.openDialog("data:text/plain,this is an active window.", "_blank",
+ "chrome,dialog=yes,width=100,height=100");
+
+isnot(getBaseWindowInterface(dialog).nativeHandle, "",
+ "the nativeHandle of a dialog should not be empty");
+
+dialog.close();
+
+todo(false, "the nativeHandle of a window without a mainWidget should be empty"); // how to build a window without a mainWidget ?
+
+SimpleTest.finish();
+ ]]></script>
+</window>