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+<!DOCTYPE HTML>
+<html>
+<!--
+Test that the parent can open modal windows, and that the modal window
+that is opened reports itself as being modal.
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test a modal window</title>
+
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+
+ <script type="application/javascript">
+
+ const {BrowserTestUtils} = ChromeUtils.import("resource://testing-common/BrowserTestUtils.jsm");
+
+ add_task(async function() {
+ BrowserTestUtils.domWindowOpened().then((win) => {
+ let treeOwner = win.docShell.treeOwner;
+ let chromeFlags = treeOwner.QueryInterface(Ci.nsIInterfaceRequestor)
+ .getInterface(Ci.nsIAppWindow)
+ .chromeFlags;
+ ok(chromeFlags & Ci.nsIWebBrowserChrome.CHROME_MODAL,
+ "Should have the modal chrome flag");
+
+ let wbc = treeOwner.QueryInterface(Ci.nsIInterfaceRequestor)
+ .getInterface(Ci.nsIWebBrowserChrome);
+ ok(wbc.isWindowModal(), "Should report as modal");
+
+ win.close();
+ });
+
+ window.openDialog("data:text/html,<p>This is a modal window for test_modal_windows.html</p>",
+ "_blank", "modal,noopener", null);
+ // Since the modal runs a nested event loop, just to be on the safe side,
+ // we'll wait a tick of the main event loop before resolving the task.
+ await new Promise(resolve => setTimeout(resolve, 0));
+ });
+
+ </script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>