HTML5 topics have been going around the web for quite sometime now.
When looking for basic information on HTML5, I came across this online book
It does help in getting basic understanding of HTML5 and removes some preconceived misconceptions as well.
Ideal for the beginners to test HTML5.
Though this is a free version, there is a print copy available from Oreilly as well
URL:
http://diveintohtml5.org/table-of-contents.html