Dive into HTML5 is a website by Mark Pilgrim that “seeks to elaborate on a hand-picked Selection of features from the HTML5 specification and other fine Standards”.
The site is based on a book that has been published by O’Reilly: “HTML5: Up & Running“. It contains many useful tutorials, and an excellent introduction section on HTML5.
Apparently, last week Mark Pilgrim, or someone on his behalf, took down his websites from the web. There are a few alternative ways to still access Dive into HTML5, in places such as:
And a bit more on the story, with more links: