Last week, we were surprised and saddened when Mark Pilgrim, long time educator, raconteur, and writer of note, decided to retire from the internet. Unfortunately, he also decided to 410: gone all of his writing, including Dive into HTML5. Mark provided this book for free on the web (under a Creative Commons By 3.0 license), in addition to a published, for-sale version entitled HTML5: Up and Runni