I’m really glad you took away the larger point from this piece. :) When I first started teaching myself mark up languages in the early 2000's, HTML5 didn’t exist yet. I was pulling from a long list of titles on HTML, XHTML, and XML. Trust me, there were (and are) far more than a dozen of such instructional books in print. Additionally, since there have been several versions of HTML since then, new material was/is always being published which leaves less time to sit and grow stagnant.