- Create a UI design toolkit that allows you to draw a user interface with divs that can have background-images that are bitmaps; and that's already a feature of HTML.
- Create an object class accessible through scripts that mirrors the object structure of HyperCard. You just have to get out the manual and clone what they had."
See also this response. One of the main criticisms is that "one problem with implementing HyperCard in the browser is that it was never designed to work in a client-server environment." I don't know either.