1. Selectors are unable to ascend as it previously rejected proposals for parent selectors are related to browser performance and incremental rendering issues.
2. Lack of column declaration
3. Absence of expressions
2 5 2
There are a few areas that CSS1 does not address, and therefore are not covered in detail in this book; some of these topics are touched upon in Chapter 10, CSS2: A Look Ahead. Of course, even a full-blown CSS implementation, covering all of CSS1 and CSS2, would not meet every request from every page designer in the world. It's worth going through some of the boundaries of CSS.CSS works differently on different browsers. IE and Opera supports CSS as different logic.