An
HTML page which contains a <FRAMESET>
tag.
These pages contain specifications for a set of frames inside
the <FRAMESET> tag, which include some method of specifying
dimensions and arrangement, as well as which other pages
to initially load into each frame.
The <NOFRAMES> tag is sometimes used on such pages to
contain a section to display on browsers which don't support frames,
though this represents a small part of the web audience today.