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2.11 Frames
Anyone
who has had more than one application window open on her graphical
desktop at a time can immediately appreciate the benefits of frames.
Frames let you divide the browser window into multiple display areas,
each containing a different document.
Figure 2-6 is an example of a frame display. It
shows how the document window may be divided into independent windows
separated by rule lines and scrollbars. What is not immediately
apparent in the example, though, is that each frame displays an
independent document, and not necessarily HTML or XHTML ones, either.
A frame may contain any valid content that the browser is capable of
displaying, including multimedia. If the frame's
contents include a hypertext link that the user selects, the new
document's contents, even another frame document,
may replace that same frame, another frame's
content, or the entire browser window.
Figure 2-6. Frames divide the browser's window into two or more independent document displays
Frames are defined in a special document, in which you replace the
<body> tag with one or more
<frameset>
tags that tell the browser how to divide its main window into
discrete frames. Special
<frame> tags go inside the
<frameset> tag and point to the documents
that go inside the frames.
The individual documents referenced and displayed in the frame
document window act independently, to a degree; the frame document
controls the entire window. You can, however, direct one
frame's document to load new content into another
frame. In Figure 2-6, for example, selecting a
Chapter hyperlink in the Table of Contents frame has the browser load
and display that Chapter's contents in the frame on
the right. That way, the Table of Contents is always available to the
user as he browses the collection. For more information on frames, see
Chapter 11.
