HTML and CSS Reference
11.3. Frame Layout
Frame layout is similar to table layout. Using the <frameset> tag, you can
arrange frames into rows and columns while defining their relative or ab-
11.3.1. The <frameset> Tag
Use the <frameset> tag to define a collection of frames and other
framesets and to control their spacing and borders. You may also nest
framesets, resulting in a richer set of layout capabilities.