Simple Script that may help you with prototyping in your Browser.
You can take a look at the example.html or at the following code which is by the way the same as the example.html in this repo
<body>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
<script src="ldh.js"></script>
you should see your divs in different colors