<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>Callback complete</title>
        <script>
            window.close();
            // Why doesn’t this work in Firefox?  See
            // https://bugzilla.mozilla.org/show_bug.cgi?id=1353466
        </script>
    </head>
    <body>
        <p>You may now close this window.</p>
    </body>
</html>
