test.html

<!DOCTYPE html>
<html>
<head>

<style>

#container {
	margin: 20px;
	padding: 20px;
	background: grey;
}

</style>

</head>
<body>

<div id="container">
	<div>Text in a div</div>
	<div><div><div>and some nested divs</div></div></div>
	and more text
</div>

<div id="log"></div>

<script src="build/build.js"></script>
<script>

var mouseInOut = require('mouse-inout')
	, el = document.querySelector('#container')
	, log = document.querySelector('#log')
;

mouseInOut.bind(el, 'mouseenter', function (e) {

	var m = document.createElement('div');
	m.innerHTML = 'Mouse Enter';

	log.appendChild(m);

});

mouseInOut.bind(el, 'mouseleave', function (e) {

	var m = document.createElement('div');
	m.innerHTML = 'Mouse Leave';

	log.appendChild(m);

});

</script>

</body>
</html>