Actually, it's possible to get an arduino to do almost anything on the web. Ever since plugins became possible (yes, I know it was years and years ago) we could simply 'include' source from an external source. Just using an iframe we can put an entire web page on the browser with only a few bytes on the arduino. Heck, we could put almost everything on a web server, and a little src=http://somebigserver/mypage to get it on the user's browser.
I use this little trick to get cool gauges and really big graphs on my little arduino web page.
Don't you just love distributed processing?