У вашего броузера проблема в совместимости с HTML5
WARNING DO NOT WATCH THIS VIDEO:
If you are so uncontrollable to watch it even after such warning, you must be a reckless maniac, and should the tree police find out about you they will come take your chainsaws in the middle of the night and write a strongly worded letter to your relatives, explaining that your risky video watching is a threat to all mankind and you should not be left alone with children.
This was mostly for fun so please don't try this technique.