Not that pirates dictate web standards, but I think this is further evidence that mp4/h.264 has bested all other formats — WebM, Flash, Xvid/AVI, mkv, etc.
From Torrent Freak:
“x264 has become the most advanced video codec over the past few years. Compared to Xvid, it is able to provide higher quality and compression at greater SD resolutions,” the rule document begins.
Happy trails to the other formats.