As others have mentioned, most of these don't work on Firefox. For the few that I looked at, the only problem seemed to be a missing unit identifier on the anim

As others have mentioned, most of these don't work on Firefox. For the few that I looked at, the only problem seemed to be a missing unit identifier on the animation delay. For a zero _length_ the unit is optional, but not for a time type - at least by my reading of the specs. It may work in blink/webkit, but I don't think it's technically valid. Edit: Have since looked at a few more of the broken ones, and found another problem source being your use of quoted strings for the animation name in some places. That too is not valid according to the specs - they should be unquoted identifiers.