Section+1+-+Week+8+-+XHTML+&+Validation

Versions of HTML: html 4.01 always start each page with a DOCTYPE starts and ends page everything must go in the or   always use a, and are opitional ,, allowed with the different types of code.....YOU have to tell the BROWSER what to do OTHERWISE it uses default code XHTML is aimed to replace HTML
 * HTML 1.0 and 2.0
 * HTML 3.0
 * HTML 4.0
 * HTML 4.01
 * XHTML 1.0
 * HTML 5.0


 * Element- delimited by angle brackets, identify the nature of the content they surround, general format: … . And an empty element is 
 * Attribute- name-value pairs that occur inside start-tags after element name like 
 * DTD
 * Well-formed
 * Validation
 * SGML
 * Strict
 * XHTML
 * Transitional
 * W3C
 * CSS
 * Frameset
 * XML- means extensible markup language not fixed format like html. XML is a meta-language- a language for describing other languages. enable you to define your own customized markup languages for different classes of documents. XML is considered the “key” to e-business. XML enables business application sharing, direct transactions and other business applications. Blending EDI(electronic data exchange) with HTML for business.

Validation is done at http://validator.w3.org/. Validation and standardization is important because a wide variety of web browsers are available to different users, and ensuring that your web content is available to all of those users is important.