Syntax
The frameset is used instead of the and tags. Rows and cols attributes can be used to describe the dimensions of the frames in comma-separated lists of sizes (in pixels or percentages). If the percentages do not add to 100 the browser should adjust the sizes proportionally. Any row or column size may be replaced with an asterisk to indicate the remainder of the remaining screen space. Within the frameset, the framed panels are described with their source documents. The
Read more about this topic: Framing (World Wide Web)