JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <script type="text/javascript">
            function openWindow(url)
            {
var wnd = window.open(url);
var timer = null;
        
var poll = function()
{
        if(wnd.closed) { alert('not opened'); clearInterval(timer); }
};        
        timer = setInterval(poll, 1000);
            }
        </script>
    </head>
        <body>
        <a href="#" onclick="openWindow('http://www.google.com'); return false;">click me</a>
    </body>
</html>