document.click(x, y) to click the element at specific coords

document-click.js

document.click = function(x, y) {
	"use strict";
	var
		  doc = this
		, node = doc.elementFromPoint(x, y)
		, click = doc.createEvent("UIEvent")
	;

	click.initUIEvent("click", true, true, self, 1);
	return node.dispatchEvent(click);
};