DOM conformance in Internet Explorer
IE 5 and later support the Level 1 Core and HTML features well enough to run the examples in this chapter, and they support the key Level 2 CSS features well enough to run most of the examples in Chapter 16. Unfortunately, IE 5, 5.5, and 6 do not support the DOM Level 2 Events module, even though Microsoft participated in the definition of this module and had ample time to implement it for IE 6. IE's lack of support for the standard event model impedes the development of advanced client-side web applications.