JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hidden" style="width:100%;height:20%;background-color:blue;display:none;">
Hidden Div Contents
</div>

JavaScript

var urlParams = {};
(function () {
    var e,
        a = /\+/g,  // Regex for replacing addition symbol with a space
        r = /([^&=]+)=?([^&]*)/g,
        d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
        q = window.location.search.substring(1);

    while (e = r.exec(q))
       urlParams[d(e[1])] = d(e[2]);
})();

if(urlParams.from) $("#hidden").show()