8.4. A Word About Frames
Previous versions of HTML supported a flexible, multipane scheme called frames. Frames enable a user agent window to be divided into defined areas, each capable of displaying different content that can be set to scroll independently from one another.
XHTML allows a special document type definition (DTD) for frame support, the Extensible HTML version 1.0 Frameset DTD, available at http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd.
There is no frameset DTD for XHTML 1.1.
Although once very popular with Web designers, frames have become an outdated construct and should not be used for the following reasons:
Frames are hard to code (requiring a special frameset document in addition to content documents) and are reasonably hard to manage.
Frame support in user agents cannot be relied on as the Web moves to more resource-constrained platforms (mostly in the mobile arena).
Frames are going the route of deprecation and aren't XHTML 1.1 compliant.
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