Is Structured HTML is a structured markup language with a very specific syntax.
Strict rules define how HTML tags are to be used.
The rules are summarized in the HTML specifications . Specifications for an HTML tag include the function of the tag, its attributes, what tags can appear within it and where the tag may be used. Now that HTML 4 has been tweaked to conform with XML, the end tags should always be used. Documents Are Structured HTML documents are heirarchically structured. Each type of element should occur only within certain other types of elements.