HTML5 (or HTML in general) book recommendations?

A reader asked what I'd recommend in terms of a good book for learning HTML5 and after realizing I had no idea, I thought I'd post it here and let my smart readers (yes I'm buttering you up) have a say. To be clear, the reader is looking for books. In general I'd easily recommend the Mozilla Developer Network for this information online, but obviously you can't (shouldn't) print that out.

So, what do recommend?

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