HTML5

HTML5 represents a radical departure from the tradition of HTML. In all previous HTML specifications, the descriptions stopped short of describing any JavaScript interfaces, instead focusing purely on the markup of the language and deferring JavaScript bindings to the DOM specification.

The HTML5 specification, on the other hand, contains a large amount of JavaScript APIs designed for use with the markup additions. Part of these APIs overlap with the DOM and define DOM extensions that browsers should provide.

---

NOTE   Because the scope of HTML5 is vast, this section focuses only on the parts that affect all DOM nodes. Other parts of HTML5 are discussed in their related topics throughout the book.

---

Class-Related Additions

One of the major changes in web development since the time HTML4 was adopted is the increased usage of the class attribute to indicate both stylistic and semantic information about elements. This caused a lot of JavaScript interaction with...