Consider HTML5 as an open web platform. What are the building blocks of HTML5?

Semantics: HTML tags describe the content.
Styling: Customizing appearance of HTML tags
Connectivity: Communicate with the server in new and innovative ways.
Offline and storage: Allows webpages to store data on the client-side locally and operate offline more efficiently.
Multimedia: Makes video and audio first-class citizens in the Open Web.
2D/3D graphics and effects: Allows a much more diverse range of presentation options.
Performance and integration: Provides greater speed optimization and better usage of computer hardware.
Device access: Allows for the usage of various input and output devices.