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+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test bug 529119</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+
+var workingURL = "http://mochi.test:8888/tests/docshell/test/mochitest/bug529119-window.html";
+// eslint-disable-next-line @microsoft/sdl/no-insecure-url
+var faultyURL = "http://some-nonexistent-domain-27489274c892748217cn2384.test/";
+
+var w = null;
+var phase = 0;
+var isWindowLoaded = false;
+// Token that represents which page we currently have loaded.
+var token = 0;
+
+function delay(msec) {
+ return new Promise(resolve => setTimeout(resolve, msec));
+}
+
+async function assignToken(tokenToAssign) {
+ await SpecialPowers.spawn(w, [tokenToAssign],
+ newToken => { this.content.token = newToken });
+}
+
+// Returns when a new page is loaded and returns whether that page is an
+// error page.
+async function pollForPage(win) {
+ while (true) {
+ try {
+ // When we do our navigation, there may be an interstitial about:blank
+ // page if the navigation involves a process switch. That about:blank
+ // will exist between the new process's docshell being created and the
+ // actual page that's being loaded loading (which can happen async from
+ // the docshell creation). We want to avoid treating the initial
+ // about:blank as a new page.
+ //
+ // We could conceivably expose Document::IsInitialDocument() as a
+ // ChromeOnly thing and use it here, but let's just filter out all
+ // about:blank, since we don't expect any in this test.
+ var haveNewPage = await SpecialPowers.spawn(w, [token],
+ currentToken => this.content.token != currentToken &&
+ this.content.location.href != "about:blank");
+
+ if (haveNewPage) {
+ ++token;
+ assignToken(token);
+
+ // In this test, error pages are non-same-origin with us, and non-error
+ // pages are same-origin.
+ let haveErrorPage = false;
+ try {
+ win.document.title;
+ } catch (ex) {
+ haveErrorPage = true;
+ }
+ return haveErrorPage;
+ }
+ } catch (e) {
+ // Something went wrong; just keep waiting.
+ }
+
+ await delay(100);
+ }
+}
+
+async function windowLoaded() {
+ // The code under here should only be run once
+ // The test popup window workingURL was already opened
+ if (isWindowLoaded)
+ return;
+ isWindowLoaded = true;
+
+ assignToken(token);
+
+ /* 2. We have successfully loaded a page, now go to a faulty URL */
+ // XXX The test fails when we change the location synchronously
+ window.setTimeout(function() {
+ w.location.href = faultyURL;
+ }, 0);
+
+ ok(await pollForPage(w), "Waiting for error page succeeded");
+ /* 3. now, while we are on the error page, navigate back */
+ try {
+ // We need the SpecialPowers bit, because this is a cross-origin window
+ // and we normally can't touch .history on those.
+ await SpecialPowers.spawn(w, [], () => this.content.history.back());
+ } catch (ex) {
+ ok(false, "w.history.back() threw " + ex);
+ }
+
+ ok(!await pollForPage(w), "Waiting for original page succeeded");
+ /* 4-finish, check we are back at the original page */
+ is(await SpecialPowers.spawn(w, [], () => this.content.location.href),
+ workingURL,
+ "Is on the previous page");
+ w.close();
+ SimpleTest.finish();
+}
+
+function startTest() {
+ /* 1. load a URL that leads to an error page */
+ w = window.open(workingURL);
+}
+
+</script>
+</head>
+<body onload="startTest();">
+</body>
+</html>