How it shows up in Chrome, IE, Safari, and Opera 12 (More or less, there is slight variation in browsers):
How it shows up in Firefox:
In Chrome, I’ve also noticed that the tooltip (Auto-generated with shared as true) will re-order the text inside for each entry with slight movements of the mouse horizontally. For example, this is is what it looks like at first:
and this is what it looks like with the mouse moved slightly to the right:
I’d also like to note that I’m a bit of a novice with Javascript, so there is a bit of room for user error. If that is the case, I apologize.
The implementation in question: http://www.pc-scene.com/lastfmgraph/graph.php?user=wheen