As with most revolutions, the birth of the Web was very chaotic, and the modifications to HTML reflected that chaos. More recently, a significant effort has been made to reel in the inconsistencies of HTML and to attempt to restore some order to the language. The problem with disorder in HTML is that web browsers have to guess at how a page is to be displayed, which is not a good thing. Ideally, a web page designer should be able to define exactly how a page is to look and have it look the same regardless of what kind of browser or operating system someone is using. This utopia is still off in the future somewhere, but XML is playing a significant role in leading us toward it, and significant progress has been made.
How do you understand that off?