HTML & XHTML: The Definitive Guide
by Chuck Musciano, Bill Kennedy
Publisher: O'Reilly 2000
Number of pages: 672
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by Mark Pilgrim - O'Reilly Media
The latest version of HTML is going to significantly change the way you develop web applications, and this book provides your first real look at HTML5's new elements and attributes. This is the most complete and authoritative book on the subject.
CSS, or cascading style sheets, are used to describe the visual style and presentation of a document, most commonly web sites. CSS separates the presentation of a document from the structure and content. This book is a guide to CSS.
by Jacqui Carrel - BookBoon
This book reveals the fundamentals of good SEO practice and gives plenty of examples. It teaches you on-site optimization: how to optimize the content on your website, and how to optimize the bits behind the scenes (the code and metatags).
by Richard Rutter, Steven Marshall - webtypography.net
In this book, the reader is taken through the principles outlined in Robert Bringhurst's 'The Elements of Typographic Style' as they apply to visual design on the web. The book goes as far as implementation, complete with the code in HTML and CSS.