Vanilla Javascript for the win

From http://sharedfil.es/js-... by ???

jQuery JavaScript
$(document).ready(function() {
  // code…
});
document.addEventListener("DOMContentLoaded", function() {
  // code…
});
var divs = $("div");
var divs = document.querySelectorAll("div");
var newDiv = $("<div/>");
var newDiv = document.createElement("div");
newDiv.addClass("foo");
newDiv.classList.add("foo");
newDiv.toggleClass("foo");
newDiv.classList.toggle("foo");
$("a").click(function() {
  // code…
})
[].forEach.call(document.querySelectorAll("a"), function(el) {
  el.addEventListener("click", function() {
    // code…
  });
});
$("body").append($("<p/>"));
document.body.appendChild(document.createElement("p"));
$("img").filter(":first").attr("alt", "My image");
document.querySelector("img").setAttribute("alt", "My image");
var parent = $("#about").parent();
var parent = document.getElementById("about").parentNode;
var clonedElement = $("#about").clone();
var clonedElement = document.getElementById("about").cloneNode(true);
$("#wrap").empty();
var wrap = document.getElementById("wrap");
while(wrap.firstChild) wrap.removeChild(wrap.firstChild);
if($("#wrap").is(":empty"))
if(!document.getElementById("wrap").hasChildNodes())
var nextElement = $("#wrap").next();
var nextElement = document.getElementById("wrap").nextSibling;

Performances

jQuery JavaScript jQuery performance
var divs = $("div");
var divs = document.querySelectorAll("div");
50% slower
var newDiv = $("<div/>");
var newDiv = document.createElement("div");
83% slower
newDiv.addClass("foo");
newDiv.classList.add("foo");
96% slower
$("body").append("<p/>");
document.body.appendChild(document.createElement("p"));
93% slower
$("img").filter(":first").attr("alt", "Hi!");
document.querySelector("img").setAttribute("alt", "Hi!");
97% slower
var parent = $("#about").parent();
var parent = document.getElementById("about").parentNode;
99% slower
var cloned = $("#about").clone();
var cloned = document.getElementById("about").cloneNode(true);
88% slower
$("#wrap").empty();
var wrap = document.getElementById("wrap");
while(wrap.firstChild) wrap.removeChild(wrap.firstChild);
97% slower
var nextElement = $("#wrap").next();
var nextElement = document.getElementById("wrap").nextSibling;
99% slower