Frames in HTML documents

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Frames in HTML documents

Frames in HTML documents are created and controlled through the structure of three element types: FRAMESET, FRAME and NOFRAMES.

-A web page containing frames is created by a main or "framing" document. This document defines the frame regions on the user agent's page or window, and addresses the documents or objects that initially appear in the frames. Hypertext anchors within any frame can also target specific frames to place the contents of addressable documents and objects.

-The structure of a frame-enabling HTML document type is similar to usual HTML structure. The key difference in an HTML document type is that the BODY container element is basically replaced by a FRAMESET container element. The initial FRAMESET element describes the frames that make up the page, and the FRAME elements specify the sub-documents that appear initially in each.

-A FRAMESET may only contain nested FRAMESET and FRAME elements. When a FRAMESET element is nested within another FRAMESET element, it acts as a subframe. A BODY element can follow the FRAMESET to provide an alternative document for user agents that do not support frames. And a BODY element can contain NOFRAMES elements whose contents are not to be rendered by user agents which support frames.

-A frame document contains a set of frames, each of which likely uses the BODY element. Elements that might normally be placed in the BODY element should not appear before the first FRAMESET element, or the FRAMESET will be ignored. The FRAMESET tag has a matching end tag.