Ebook: HTML & XHTML Pocket Reference: Quick, Comprehensive, Indispensible (Pocket Reference (O'Reilly))

The table of contents is minimal, and the real reference content is in one big section of tags in alphabetical order, so you have to page down until you get to what you're looking for. Also, the 4th edition of the book from 2000 had great appendices with CSS information, but that's missing from this reference. The lack of a good ToC or any index makes this not useful for quick reference.