Untitled

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>DIV's Content</title>
</head>
<body>
<div>first div</div>
<div>second div</div>
<div class="empty"></div>
<div>third div<div>inner div</div></div>
<ul id="result"></ul>
<script>
    var inputs = document.getElementsByTagName('div');
    var list = document.getElementById('result');
    for(var i = 0; i<inputs.length; i++){

        var liElement = document.createElement('li');
        liElement.innerHTML = inputs[i].innerHTML;
        list.appendChild(liElement);
    }
</script>

</body>
</html>