Just a WACky experiment
There is now an effort called WAC to produce a standard-ish package format and api for html widgets and simple apps.
Whether this will go somewhere or not is early to say (just usual wait and see;), but i wondered how hard could it be support loading a package in the wac format and correctly displaying it into a plasma desktop/netbook/tablet session, so this is the result of literally 30 minutes of work ;) (TicTac toe and the todo thing are example WAC widgets, the rss feed reader is in pure QML)
This can be found in the branch plasma/mart/wac-appletscript of the kde-workspace repo, or can be directly tried built in in the Plasma Active One release (there you go, another reason to try out Plasma Active if there weren't enough ;)
This is not going in an official near KDE Workspace release since is far from be complete. Namely, it's lacking the device api, but since is very easy to bind extra objects to QtWebkit, is just matter to sit down and doing it (contributions, as usual are welcome ;).
Great experiment buddy!
I like the look of the button and text input widget in the news reader applet.
Is it possible to get that same widget look on Plasma desktop?