I am not quite sure what it is html5=1 does, but from you've written about it one can make Youtube embeds use the html5 player by using it. I'd expect it to effect the main Youtube site as well though.
However, upon trying different embeds and Youtube itself, the html5 video player does not seem to be active, also upon inspecting youtube.com/html5, so it seems to me that html5=1 as it is now has no effect. Which is too bad because it should be an improvement over using Flash.
I am not quite sure what it is html5=1 does, but from you've written about it one can make Youtube embeds use the html5 player by using it. I'd expect it to effect the main Youtube site as well though.
However, upon trying different embeds and Youtube itself, the html5 video player does not seem to be active, also upon inspecting youtube.com/html5, so it seems to me that html5=1 as it is now has no effect. Which is too bad because it should be an improvement over using Flash.