on blur for every place ever

gistfile1.txt

// Taken from line 456 of this: http://williamriley.me/js/vendor/metronome.js

	var hidden = "hidden";
	// Standards:
	if (hidden in document)
		document.addEventListener("visibilitychange", onchange);
	else if ((hidden = "mozHidden") in document)
		document.addEventListener("mozvisibilitychange", onchange);
	else if ((hidden = "webkitHidden") in document)
		document.addEventListener("webkitvisibilitychange", onchange);
	else if ((hidden = "msHidden") in document)
		document.addEventListener("msvisibilitychange", onchange);
	// IE 9 and lower:
	else if ('onfocusin' in document)
		document.onfocusin = document.onfocusout = onchange;
	// All others:
	else
		window.onpageshow = window.onpagehide
	= window.onfocus = window.onblur = onchange;

	function onchange (evt) {
		var v = 'visible', h = 'hidden',
		evtMap = {
			focus:v, focusin:v, pageshow:v, blur:h, focusout:h, pagehide:h
		};
		evt = evt || window.event;
		if (evt.type in evtMap) {
			// logic
		}
		else {
		  // logic
		}
	}