Below is a snapshot from highlight.r-enthusiasts.com that uses the tooltips:
See also a live example here: data.frame
Using this feature is simple. You just need to include jquery and my plugin like this:
<link rel='stylesheet' href='//highlight.r-enthusiasts.com/css/highlight.css'> <script src="//highlight.r-enthusiasts.com/js/highlight.js"></script>
And that’s it, all links similar to
will get a nice tooltip showing extra information.