Y.one, Y.all and $() return values

fiddle.css

h1 {font: bold 1.25em sans-serif; margin: 0.75em 0}
ul {list-style-type: disc; padding: 0 0 0 5%}
body {line-height: 1.5}
b {font-family: monospace; background: yellow}

fiddle.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.js"></script>
<script src="http://yui.yahooapis.com/3.4.0/build/yui/yui-min.js"></script>

<h1>What are the return values when Y.one and Y.all (from YUI3) and $() (from jQuery) can't find the specified node.</h1>

<ul>
    <li id="y-one">When Y.one() can't find a matching node, it returns <b></b>.</li>
    <li id="y-all">When Y.all() can't find a matching node, it returns <b></b>.</li>
    <li id="jquery">When $() can't find a matching node, it returns <b></b>.</li>
</ul>

<p>Please note that YUI3 has its own toString method that gives more information on the returned value.</p>
    

fiddle.js

window.addEventListener("load", function () {
	YUI().use("node", function (Y) {

		Y.one("#y-one b").setContent(Y.one("foo") + "");

		Y.one("#y-all b").setContent(Object.prototype.toString.call(Y.all("foo")) + " " + Y.all("foo") + "");

	});

	$("#jquery b").html($("foo") + "");
});