Mark Pilgrim's "Dive Into HTML5: A Quite Biased History of HTML5"
At this moment, the Web is undergoing a significant transition from serving web documents using HTML4-based markup toward HTML5. Mark Pilgrim's book advocates for the use of cutting edge HTML5 technologies, and in this chapter he gives a brief history of how HTML4, XHTML, and HTML5 came into being from the standpoint of an insider. For the purposes of this course, we will be primarily learning the HTML4 standard, but we will occasionally look at HTML5 alternatives. Many of the features of HTML5 that distinguish it from HTML4 are useful for kinds of functionality that are outside of the scope of an Introduction to HTML and CSS; for further information, consider reading Pilgrim's book after completing this course.