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Unobtrusive scripting

The answers are hidden "off-screen", the script allows users to toggle them on and off.

Frames FAQ

Frames in capable browsers
Browsers have been "frames enabled" since NN2/MSIE3; it is, however, possible to turn frames off in some modern browsers.
Bookmarking
The browser's built-in feature bookmarks the URL from the address bar instead of a particular frameset state. When the user returns to the bookmarked page he only gets the default frameset instead of accessing the original frameset state.
Title of framed pages
By default, documents that load inside frames don't affect the title displayed at the top of the browser window. The title corresponds to the document loaded in the topmost window.
Sending someone the link to a framed page
The browser's built-in feature sends the URL from the address bar. The recipient of the email accesses the frameset with its default documents for each frame instead of accessing a particular frameset state.