Rather than expecting each application using WebKit to implement support for keyboard toggle-able caret navigation (e.g. with F7), it would be ideal if WebKit does the implementation. See this thread for more information (thanks Xan!): http://email@example.com/msg17531.html
To get the ball rolling, I've filed the following RFEs:
Xan indicated that he'd prefer I not track this bug by 25531. Yet, it is still an important bug for Orca users wishing to access apps which use WebKit. Therefore, I'm adding it to bug 30796.
See also: https://bugzilla.gnome.org/show_bug.cgi?id=602526