http://dev.w3.org/html5/spec/Overview.html#the-ruby-element
Seems to be part of the standard...
i'd say go right ahead.
I'll note also that it's a draft - something that annoys me with HTML5. New drafts are sent every next day or so, so it's not actually very standard. It's a different story though.
http://dev.w3.org/html5/spec/Overview.html#the-ruby-element
Seems to be part of the standard...