I really think deviantART should allow users to upload HTML5 deviations (and by that, I mean deviations similar to the stuff in the Flash category, but made with HTML5 + JavaScript rather than Adobe Flash / ActionScript).  With HTML5 you can create games, animations, etc. — pretty much the same sort of stuff you can create in Flash, and I think this sort of stuff should be submittable.  I posted about this on the forums at some point in the past but I'm still not buying the reasons people are against it:

• Some people said that HTML5 games and other content are not "art".  But I disagree.  I come from the game design field and games are just as much art as the other fields of design or film (both of which are categories on here).  And even if the game or animation is made purely for entertainment rather than for artistic purposes, that still doesn't dismiss the artistic merit of the work.  On top of that, clearly deviantART acknowledges this... otherwise there would be no Flash category here because it's more or less the same sort of works.

• Some people were saying HTML5 and JavaScript is a security risk.  That much is true, but it's not much more of a security risk than some of the other stuff you can submit.  Malware can be embedded into swf files and submitted in the Flash category.  Malware can be put into zip files which can be uploaded here.  You can even put malware into all sorts of other files which can be uploaded here.  But all of that is clearly against the Terms of Use and in many cases illegal, which brings me to my second point.  It is not deviantART's responsibility to prevent illegal content from being uploaded at the cost of blocking legitimate artwork.  You can say that about anything on here... deviantART allows images to be uploaded even though they might be pornographic or infringe on copyright.  And deviantART allows for zip files to be uploaded even though they might contain malware.  That's why users are supposed to report this sort of stuff, so that deviantART can remove the content, ban the users, and/or take further action.  But I don't see why HTML5 content itself should be banned for something like this.  If anything, display a warning message for the viewer stating that deviantART cannot guarantee the safety of any HTML5 deviation or something, but the outright banning of all HTML5 content is senseless.

The only other reason that I can imagine for not allowing such submissions is that it would take a lot of work implementing such a feature / making the site compatible with these deviations.  And HTML5 is still relatively new, but since it is becoming a lot more widespread, I still think deviantART should consider it.