Looks pretty but isn't very practical. E.g. why is the 'webfonts' label way off the screen from the point it is first implemented? How do I see what features were implemented in a particular browser version? Why is there a massive text banner in front of the screen shots of different browser versions?
I think it's supposed to trace a line between the first implementation of each feature in each browser. Where the colored lines intersect a dot, that's where the feature was implemented. The rest is just flair.
