JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/jcubic/sysend.js/master/sysend.js"></script>

JavaScript

sysend.on('notification', function() {
   sysend.broadcast('multiple');
});
sysend.on('multiple', function() {
   alert('multiple pages');
});
sysend.broadcast('notification');