<!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>
