window.onload = function () {
            var opener = window.opener;

            var notifyParent = function (eventName, eventData) {
                // Backwards compatibility layer for old mobile apps which
                // look for very specific URLs. This should come before the
                // location.hash change below since this doesn't trigger a URL
                // change event but changing the hash does.
                // TODO: Remove this by November 4th!
                history.pushState({}, document.title, '/next/login-success/');

                // Change the hash, to signal mobile apps. See the help article:
                // https://help.disqus.com/customer/en/portal/articles/472096
                window.location.hash = encodeURIComponent(eventName);

                if (!opener)
                    return;

                const {
                  disqusauth = '',
                  disqusauths = ''
                } = Object.fromEntries(document.cookie.split('; ').map(c => c.split('=')));

                const extendedEventData = {
                  ...eventData,
                  disqusauth,
                  disqusauths,
                }

                try {
                    // This is the old, deprecated direct-access method for
                    // IE8 and IE9 since postMessage does not work there for
                    // cross-origin popups
                    opener.DISQUS.Bus.trigger(eventName, extendedEventData);
                } catch (err) {
                    var msg = JSON.stringify({
                        scope: 'client',
                        name: eventName,
                        data: extendedEventData,
                    });

                    // Post to both secure and insecure origins since we don't know
                    // which one is our opener on. It's not impossible to figure it
                    // out but this is simply easier.
                    opener.postMessage(msg, 'http://disqus.com');
                    opener.postMessage(msg, 'https://disqus.com');

                    // Additionally post to Polls because it has different origin
                    opener.postMessage(msg, 'http://polls.services.disqus.com');
                    opener.postMessage(msg, 'https://polls.services.disqus.com');
                }
            };

            var closeWindow = function () {
                if (opener)
                    return window.close();

                // If the window doesn't have an opener, this page was likely opened
                // in the same window as the discussion embed, such as in a native app's
                // web view component. If that's the case, check the discussion url that
                // we store at the beginning of the login process to determine where to
                // go next.
                var sessionStorage = window.sessionStorage;
                try {
                    var discussionUrl = sessionStorage && sessionStorage.getItem('discussionUrl');
                    if (discussionUrl)
                        return window.location.assign(discussionUrl);
                } catch (err) {
                    // Fall through
                }

                // If there's an error or no discussionUrl, we can make our best guess
                // that the discussion is two pages back. This won't always be the case,
                // such as if the user clicks any links in the login window, but it
                // should be the case most of the time.
                window.history.go(-2);
            };

            try {
                notifyParent(
                    '!auth:success',
                    {"sessionId": "27e74f42-18a6-11f1-7cac-120c0a7012db", "message": "", "log_event": ""}
                );
            } finally {
                // setTimeout is necessary because iOS does not allow you to close the
                // popup immediately. It also has serious issues about doing things
                // on the parent page when the popup is still open so this should
                // be closed as soon as it sends the necessary info to the parent.
                if (opener)
                    setTimeout(closeWindow, 300);  // close the window no matter what
            }
        };