, PaoloM wrote

Er... no.

HTML5 can be used to develop both web applications and client side applications. I was just asking how do you develop a client side application using "web technology" that is also deployable cross platform and makes use of the underlying OS functionality (OS/X keychain or Win8 contracts, for example)

I wonder how thoroughly sandboxed a web control is on W8/OS/X? If you hook events in the web control like I did in VB6 eons ago you might be able to rig a thin client host that provides your web app with those services. Kinda like Facebook did with their Android client (and in their case it was a fail but we're taking PCs here)