HTML & XHTML: The Complete Reference is an educational resource centered on learning Web markup and development. Published by Osborne/McGraw-Hill, the book is presented as a comprehensive guide to building and designing dynamic, fully functional websites, with a preview available through its companion website. The site introduces core concepts in XHTML, CSS, and Web development, emphasizing standards in use at the time it was created.

Its reference material covers HTML and XHTML elements alongside CSS properties, color values, character codes, and font information. Visitors can also explore chapters, examples, errata, and a collection of HTML5 examples, making the site useful for studying markup and consulting specific technical topics. The website states that it is no longer updated or supported and is preserved for historical reasons; some techniques may therefore appear antiquated by modern standards.

The site’s contents and programming are credited to PINT Inc., while the print work’s contents are credited to The McGraw-Hill Companies