I personally do not think this is a good idea, unless you're talking about sphere 2.0, sphere is ancient.If you want to develop games for the web try out stencyl, wait for 3.0 though as Haxe will be the default language.
well that's why the web based Sphere ideas exists
welp, since i guess everyone else dropped this inexplicably
Yeah because it's a whole lot of work! You can still share Sphere games with friends though, and someday there might just be a web version of it, but not anytime soon.