dom ready with IExx compat

waitReady.js

function waitReady(cb) {
	if (waitReady.done) return cb();
	// https://github.com/jquery/jquery/issues/2100
	if (document.readyState == "complete" ||
		(document.readyState != "loading" && !document.documentElement.doScroll)) {
		waitReady.done = true;
		return setTimeout(cb);
	}
	var self = this;
	function listener() {
		document.removeEventListener('DOMContentLoaded', listener);
		window.removeEventListener('load', listener);
		if (waitReady.done) return;
		waitReady.done = true;
		cb();
	}
	document.addEventListener('DOMContentLoaded', listener);
	window.addEventListener('load', listener);
}