fiddle with CSS dynamically on static sites using URL params

script.js

(function(){

    /*! js-ready - v0.0.1
* https://github.com/zombiept2/js-ready
* Copyright (c) 2014; Licensed MIT */
    var ready=(function(){var f,b,c={};c["[object Boolean]"]="boolean";c["[object Number]"]="number";c["[object String]"]="string";c["[object Function]"]="function";c["[object Array]"]="array";c["[object Date]"]="date";c["[object RegExp]"]="regexp";c["[object Object]"]="object";var d={isReady:false,readyWait:1,holdReady:function(g){if(g){d.readyWait++}else{d.ready(true)}},ready:function(g){if((g===true&&!--d.readyWait)||(g!==true&&!d.isReady)){if(!document.body){return setTimeout(d.ready,1)}d.isReady=true;if(g!==true&&--d.readyWait>0){return}f.resolveWith(document,[d])}},bindReady:function(){if(f){return}f=d._Deferred();if(document.readyState==="complete"){return setTimeout(d.ready,1)}if(document.addEventListener){document.addEventListener("DOMContentLoaded",b,false);window.addEventListener("load",d.ready,false)}else{if(document.attachEvent){document.attachEvent("onreadystatechange",b);window.attachEvent("onload",d.ready);var g=false;try{g=window.frameElement==null}catch(h){}if(document.documentElement.doScroll&&g){a()}}}},_Deferred:function(){var j=[],k,h,i,g={done:function(){if(!i){var m=arguments,n,q,p,o,l;if(k){l=k;k=0}for(n=0,q=m.length;n<q;n++){p=m[n];o=d.type(p);if(o==="array"){g.done.apply(g,p)}else{if(o==="function"){j.push(p)}}}if(l){g.resolveWith(l[0],l[1])}}return this},resolveWith:function(m,l){if(!i&&!k&&!h){l=l||[];h=1;try{while(j[0]){j.shift().apply(m,l)}}finally{k=[m,l];h=0}}return this},resolve:function(){g.resolveWith(this,arguments);return this},isResolved:function(){return !!(h||k)},cancel:function(){i=1;j=[];return this}};return g},type:function(g){return g==null?String(g):c[Object.prototype.toString.call(g)]||"object"}};function a(){if(d.isReady){return}try{document.documentElement.doScroll("left")}catch(g){setTimeout(a,1);return}d.ready()}if(document.addEventListener){b=function(){document.removeEventListener("DOMContentLoaded",b,false);d.ready()}}else{if(document.attachEvent){b=function(){if(document.readyState==="complete"){document.detachEvent("onreadystatechange",b);d.ready()}}}}function e(h){d.bindReady();var g=d.type(h);f.done(h)}return e})();

    function getUrlParameter(sParam) {
        var sPageURL = window.location.search.substring(1),
            sURLVariables = sPageURL.split('&'),
            sParameterName,
            i;
    
        for (i = 0; i < sURLVariables.length; i++) {
            sParameterName = sURLVariables[i].split('=');
    
            if (sParameterName[0] === sParam) {
                return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
            }
        }
    };

    function hasClass(ele,cls) {
        return !!ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
    }
    
    function addClass(ele,cls) {
        if (!hasClass(ele,cls)) ele.className += " "+cls;
    }
    
    function removeClass(ele,cls) {
        if (hasClass(ele,cls)) {
            var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
            ele.className=ele.className.replace(reg,' ');
        }
    }

    var embedded = getUrlParameter("embed")
    if(embedded){
        addClass(document.getElementsByTagName("body")[0], "embedded")
    }

    
})()