Test case details

Preparation Code

<div id="container">   <p id="foo">Foo</p>   <p id="bar">Bar</p>   <p id="baz">Baz</p> </div>
var root = document.getElementById("container");

Test cases

Test #1

var bar = [].filter.call(root.getElementsByTagName("*"), function(e) { return e.id === "bar" })[0]

Test #2

var bar = root.querySelector("#bar");