The first tag with which is necessary to begin the description of documents HTML, the tag <HTML> is. It should begin always the description of the document, and to finish the description of the document owes a tag </HTML>. These tags designate, that lines taking place between them represent the uniform HTML-document. In itself the document is an ordinary text ASCII-file. Without these tags the browser or other program of viewing, probably, be unable to identify a format of the document and to interpret it correctly.
More often the tag <HTML> is used without parameters. In the previous versions the parameter the VERSION cancelled by specification HTML 4.0 was used. On change to this parameter there has come a tag <! DOCTYPE>.
The majority of modern browsers can identify the document and not containing tags <HTML> and </HTML>, nevertheless their use is extremely desirable.
Between pair tags <HTML> and </HTML> the document settles down. The document can consist of two sections — the unit of heading (beginning a tag <HEAD>) and the unit of a substantial part of the document (beginning a tag <the BODY (BODY)>). For the documents describing frame structures, instead of the unit the BODY (BODY) is used section FRAMESET (with a tag <FRAMESET>). Further rules of drawing up of sections of the document will be considered HEAD also the BODY (BODY).