notification.html

<!DOCTYPE html>

<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
    </head>
    <body>
        <button onclick="calculate()">calculate</button>

        <script type="text/javascript">
            window.onload = function () {
                if (window.Notification) {
                    Notification.requestPermission();
                }
            };

            function calculate() {
                notify();
            }

            function notify() {
                var notification = new Notification("Notification title", {
                    icon: "http://cdn.sstatic.net/stackexchange/img/logos/so/so-icon.png",
                    body: "Notification text",
                });

                notification.onclick = function () {
                    window.open("http://google.com");
                };
            }
        </script>
    </body>
</html>