HTML is a markup language for content presentation on the World Wide Web. This purpose is to support encoding the content including the various multimedia methods and providing human and machine readable syntax. And its wide usage promoting by W3 consortium assists interoperability between different application interfaces. We already examine this interoperability through the lab exercise for week 8. The HTML document encodes the content with elements and their attributes which specify a use of an element. However, the fifth version of HTML, HTML 5, is still working on the progress by a cooperation work between W3C and
the WHATWG, and it has several reinforcements comparing with the previous version of HTML 4 in many ways. Those reinforcements include below;
*New Elements
*New Attributes
*Full CSS3 Support
*Video and Audio
*2D/3D Graphics
*Local Storage
*Local SQL Database
*Web Applications (http://en.wikipedia.org/wiki/HTML5)
XTML stands for EXtensible HyperText Markup Language, and it has characteristics of XML and HTML, together. There are several differences in XHTML from HTML, and they are “XHTML elements must be properly nested, XHTML elements must always be closed, XHTML elements must be in lowercase, and XHTML documents must have one root element" ( http://www.w3schools.com/html/html_xhtml.asp).
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