I have for testing my latest museum tour installed an Win 8.1 with Parallels on my new iMac
I also have an XP so I can test it all on same machine.
I use HTML5 prefer which seems to work fine.
In XP IE8 and Firefox just automatically chooses Flash. Chrome and Safari both are able to use HTML5 and also this happens automatic.
However the same Chrome latest version is not able to use HTML5 in 8.1 which is kind of weird as the virtual video simulation and ram is set to same on both XP and 8.1.
But thats not the big problem. What Chrome does is that it does not choose flash automatic even if you have it but instead it gives you a yellow bar at the top which says something is wrong and Web GL has got a problem.
Then it gives you 2 options ignore and try again.
If you ignore it shows you the flash version so thats OK but if you choose the Try again option you just get a black pano without any other info. Nothing about Flash being an option.
IE11 works great in 8.1 WebGL works perfect even with the virtual Video in Parallels.
On Android Chrome is also the worst browser. I tested it on 3 different mobiles . My own galaxy note 2 and a brand new S3 + a new large HTC on all of them Firefox is superior in every way.
It is 3 times faster than the standard Android which takes ages to load if you have a lot of html text.
Also Firefox is the only browser where you do not have dancing hotspots.
But les than 5% of Android users have it.