As everybody in Web development industry knows that HTML 5 is right now very hot topic.
It has quite a lot of potential to change the way we develop "Web Application".
Yes, you can do a lot using Flash or Silverlight, but considering it's standard and possible "mobile" application makes it very valuable.
So, here are some resources you can start researching:
Reading & Reference:
Useful JavaScript Library
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Modernizr is a Javascript library to make it possible to target specific browser.
To test your browser's compatibility...
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Html5test.com
It evaluates the browser's compatibility to HTML5. The score is ### out of 300.
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Acid3.acidtests.org
This is a similar site, from the Web Standards Project's Acid Tests site.
Potentials
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Processing.js
This site is a Javascript version of Processing.org, who provides various image processing information.
"Processing is an open source programming language and environment for people who want to create images, animations, and interactions."