This industry moves fast — really fast! If you're not careful, you'll be left in its dust. So, if you're feeling a bit overwhelmed with the coming changes/updates in HTML5, use this as a primer of the things you must know.

  1. New Doctype
  2. The Figure Element
  3. <small> Redefined
  4. No More Types for Scripts and Links
  5. To Quote or Not to Quote.
  6. Make your Content Editable
  7. Email Inputs
  8. Placeholders
  9. Local Storage
  10. The Semantic Header and Footer
  11. More HTML5 Form Features
  12. Internet Explorer and HTML5
  13. hgroup
  14. Required Attribute
  15. Autofocus Attribute
  16. Audio Support
  17. Video Support
  18. Preload Videos
  19. Display Controls
  20. Regular Expressions
  21. Detect Support for Attributes
  22. Mark Element
  23. When to Use a <div>
  24. What to Immediately Begin Using
  25. What is Not HTML5
  26. The Data Attribute
  27. The Output Element
  28. Create Sliders with the Range Input

See : http://goo.gl/YWecK