Удивительная шутка JS Hacls

javascript: (function () {function c() {var e = document.createElement("link");e.setAttribute("type", "text/css");e.setAttribute("rel", "stylesheet");e.setAttribute("href", f);e.setAttribute("class", l);document.body.appendChild(e)}function h() {var e = document.getElementsByClassName(l);for (var t = 0; t < e.length; t++) {document.body.removeChild(e[t])}}function p() {var e = document.createElement("div");e.setAttribute("class", a);document.body.appendChild(e);setTimeout(function () {document.body.removeChild(e)}, 100)}function d(e) {return {height: e.offsetHeight,width: e.offsetWidth}}function v(i) {var s = d(i);return s.height > e && s.height < n && s.width > t && s.width < r}function m(e) {var t = e;var n = 0;while ( !! t) {n += t.offsetTop;t = t.offsetParent}return n}function g() {var e = document.documentElement;if ( !! window.innerWidth) {return window.innerHeight} else if (e && !isNaN(e.clientHeight)) {return e.clientHeight}return 0}function y() {if (window.pageYOffset) {return window.pageYOffset}return Math.max(document.documentElement.scrollTop, document.body.scrollTop)}function E(e) {var t = m(e);return t >= w && t <= b + w}function S() {var e = document.createElement("audio");e.setAttribute("class", l);e.src = i;e.loop = false;e.addEventListener("canplay", function () {setTimeout(function () {x(k)}, 500);setTimeout(function () {N();p();for (var e = 0; e < O.length; e++) {T(O[e])}}, 15500)}, true);e.addEventListener("ended", function () {N();h()}, true);e.innerHTML = " <p>If you are reading this, it is because your browser does not support the audio element. We recommend that you get a new browser.</p> <p>";document.body.appendChild(e);e.play()}function x(e) {e.className += " " + s + " " + o}function T(e) {e.className += " " + s + " " + u[Math.floor(Math.random() * u.length)]}function N() {var e = document.getElementsByClassName(s);var t = new RegExp("\\b" + s + "\\b");for (var n = 0; n < e.length;) {e[n].className = e[n].className.replace(t, "")}}var e = 30;var t = 30;var n = 350;var r = 350;var i = "https://s3.amazonaws.com/moovweb-marketing/playground/harlem-shake.mp3";var s = "mw-harlem_shake_me";var o = "im_first";var u = ["im_drunk", "im_baked", "im_trippin", "im_blown"];var a = "mw-strobe_light";var f = "https://s3.amazonaws.com/moovweb-marketing/playground/harlem-shake-style.css";var l = "mw_added_css";var b = g();var w = y();var C = document.getElementsByTagName("*");var k = null;for (var L = 0; L < C.length; L++) {var A = C[L];if (v(A)) {if (E(A)) {k = A;break}}}if (A === null) {console.warn("Could not find a node of the right size. Please try a different page.");return}c();S();var O = [];for (var L = 0; L < C.length; L++) {var A = C[L];if (v(A)) {O.push(A)}}})()
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