JSFiddle - React, Tailwind, and code Playground

HTML

<button id="open" type="button">Click to open pop-up</button>

JavaScript

if (Storage !== void 0) {
    Storage.refreshIframe = void 0;
    var checkForRefresh = function() {
        if (Storage.refreshIframe === true) {
            Storage.refreshIframe = void 0;
            $('body').append('<p>Refresh iframe now</p>');
        }
    };
    $(window).on('focus', function() {
        checkForRefresh();
    });
    setInterval(function() {
        checkForRefresh();
    }, 1000);
    $('#open').on('click', function() {
        var popup = window.open("", "popupWindow", "width=600, height=400");
        var $p = $(popup.document.body);
        $p.append('<button id="refresh" type="button">Refresh iframe</button>');
        $p.find('#refresh').on('click', function() {
            Storage.refreshIframe = true;
        });
    });
}