HTML and CSS Reference
11.6.2. Using Inline Frames
Although you'll probably shy away from them for most of your web
pages, inline frames can be useful, particularly for providing information
related to the current document being viewed, similar to the sidebar art-
icles you find in a conventional printed publication.
Except for their location within conventional document content, inline
frames are treated exactly like regular frames. You can load other doc-
uments into the inline frame using its name (see the next section) and
link to other documents from within the inline frame.