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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1120222
+-->
+<head>
+ <meta charset=utf-8>
+ <title>Test document-title-changed observer</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"/>
+</head>
+<body>
+ <script>
+ SimpleTest.waitForExplicitFinish();
+ const obsSvc = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
+
+ const observer = {
+ observe: (aSubject, aTopic, aData) => {
+ if (aTopic === "document-title-changed") {
+ SimpleTest.ok(true, "document-title-changed was received.");
+ obsSvc.removeObserver(observer, "document-title-changed");
+ SimpleTest.finish();
+ }
+ },
+ };
+
+ obsSvc.addObserver(observer, "document-title-changed");
+ document.title = "Changed title";
+ </script>
+</body>
+</html>