A paper presents some results of cross-browser testing of HTML5 video. This sort of work is very helpful since it draws attention away from browser vendor PR efforts and towards the sort of issues that really impact Web developers, with actionable data.
Having said that, it's also very interesting to compare how browsers fare on correctness benchmarks designed without a browser-vendor axe to grind. Gecko usually does very well on such benchmarks and this one is no exception. If you read through the paper, we get almost everything right except a few event-firing issues (that I don't understand yet), more so than the other browsers.
Of course no test suite is perfect, and this one misses the massive Chrome canplaythrough bug: Chrome doesn't really implement canplaythrough at all. It simply fires canplaythrough immediately after canplay in all circumstances. That's still causing problems for other browsers which implement canplaythrough properly, since some Web sites have been written to depend on canplaythrough always firing immediately.
Still, this is good work and I'd like to see more like it.