HTML5 is an important markup language that structures and presents web content across all devices. It is important because of growing smartphone use, support from major companies, richer features than previous versions, growing browser support, and its simplicity, flexibility and standardization. CSS3 is the new version of cascading style sheets, which work with HTML to provide visual presentation of web documents. CSS3 offers new design possibilities and more diverse style sheets.

2.  Introduction:
o HTML5 is a markup language for structuring and presenting content
for the World Wide Web and a core technology of the Internet. It is the
fifth revision of the HTML standard and, as of October 2012, is still
under development. Its core aims have been to improve the language
with support for the latest multimedia while keeping it easily readable
by humans and consistently understood by computers and devices
(web browsers, parsers, etc.).

3.  Why is HTML5 important?
o HTML5 promises users a better web experience than its predecessor
across all devices whether they are Smartphone's like the iPhone or
Android, traditional Computers and the newer Tablets and Netbooks.

4.  The 5 reasons why HTML5 is important
 Growing Smartphone use for accessing the internet
 Strong commitment and support from leading web companies
 A richer feature set than earlier HTML versions
 Growing support in the leading web browsers
 Simplicity, Flexibility and Standardization

5.  What is CSS3?
o Cascading Style Sheets (CSS) are the modern standard for website
presentation. When combined with structural markup language like
HTML, XHTML, or XML (though not limited to these), CSS provide
Internet browsers with the information that enables them to present all
the visual aspects and elements of a web document.

6.  About CSS3:
o CSS3 is the new kid in the stylesheet family. It offers exciting new
possibilities to create an impact with your designs, allows you to use
more diverse style sheets for a variety of occasions and lots more.