A lot to learn from the Acid tests. I made a clean room animated PNG implementation today. It would have been a lot easier if I had had a piece of audited software that parsed my output and rated how close it was to the spec, and on what aspects it deviated. It took an unreasonable amount of time to notice that the sequence numbers of fcTL and fdAT should increase together as a series. Something I feel and Acis Test would have been much faster at noticing.