If you really after a web wallet, then watch out myTREZOR.

It will be as easy to use as any web application with no sign-up. Your keys will be in your hand, literally, in a high security special purpose device, safe from any hacks.

http://www.bitcointrezor.com/news/2014-02-10-mytrezor-bop-bitcoin-server

Here you have its first public demo in Berlin:
http://vimeo.com/90026733