JQ Fill And Color All Empty DOM Elements

<center>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(this).click(function(){
    $(":empty").css("background-color", "red");
    $(":empty").text('TEST!!');
});
</script>
</head>
<body><textarea>This JQuery source shows you how to find elements that are empty or not.</textarea>
<textarea></textarea><br>
<li></li>
<br><br>
<button>Find Empty Elements</button>
</body>
</html>