I don't want to be that guy but I originally thought the CSS was broken. Harsh black on harsh white, everything squeezed in to the left third of my screen, and an unused scrollbar on the bottom.

That being said, I love the information. I don't care for the workflow that comes with the most popular parser generators and I inevitably want more control over my parser as I start adding error handling, etc. It's easier to just write it by hand in the first place