HTML appears to support vertical text so it might be worth adding to the app. However, this will require rewriting a good portion of the app (all the scrolling action should easily switch between vertical and horizontal, not to mention the dictionary popup would have to adjust to the vertical layout).
HTML appears to support vertical text so it might be worth adding to the app. However, this will require rewriting a good portion of the app (all the scrolling action should easily switch between vertical and horizontal, not to mention the dictionary popup would have to adjust to the vertical layout).