why and how does jQuery use an undeclared variable as an ID

Question

Where is the documentation that explains why/how this works? jQuery interprets an undeclared variable as an id. I find this odd, and encountered by chance. How does it work?

HTML

<div id="wrapper"> <input id="a" value="click" type="button" /> </div>

JS

$(wrapper).on("click", "#a", function(){ alert("test"); });

JSBIN

@zzzzBov: That's a quirk of Microsoft Internet Explorer, not JavaScript. :P — Amadan
– Amadan, Commented Nov 15, 2013 at 19:36
@Amadan, all browsers do it, not just IE. It's a quirk of the language for backwards compatibility. — zzzzBov
– zzzzBov, Commented Nov 15, 2013 at 19:37

lonesomeday · Accepted Answer · 2013-11-15 19:34:24Z

It doesn't. Javascript/the DOM does.

The id attribute is used to create a global variable that points to each element with an id.

This behaviour has been in Internet Explorer for years, and is now standardised in HTML5.

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