1. HTML5 Tutorial
2. HTML5 DOCTYPE
3. HTML5 Language
4. HTML5 Character Encoding
5. HTML5 Form Fields
6. HTML5 Local Storage
7. HTML5 Geo Location
8. HTML5 Messaging
9. HTML5 Drag and Drop
10. HTML5 Web Workers
11. HTML5 Semantic Elements
12. HTML5 header Element
13. HTML5 hgroup Element
14. HTML5 Footer
15. HTML5 nav Element
16. HTML5 article element
17. HTML5 time Element
18. HTML5 File API
19. HTML5 History API

The language used in an HTML5 page is specified in the html element using the lang attribute, like this:

<!DOCTYPE html>
<html lang="en">

</html>

Click here, for a complete list of HTML language codes.