February 2006
Intermediate to advanced
826 pages
63h 42m
English
Content preview from Web Design in a Nutshell, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Presentation Layer
Now that all presentation instructions have been removed from the markup standard, this information is the exclusive job of Cascading Style Sheets. Style sheets standards are being developed in phases, as follows.
- Cascading Style Sheets (CSS) Level 1
This style sheet standard has been a Recommendation since 1996 and is now fully supported by current browser versions. Level 1 contains rules that control the display of text, margins, and borders.
- CSS Level 2.1
This Recommendation is best known for the addition of absolute positioning of web page elements. Level 2 reached Recommendation status in 1998, and the 2.1 revision is a Candidate Recommendation as of this writing. Support for CSS 2.1 is still inconsistent in current browser versions.
- CSS Level 3
Level 3 builds on Level 2 but is modularized to make future expansion simpler and to allow devices to support logical subsets. This version is still in development.
You can find links to all three CSS specifications on this page: http://www.w3.org/Style/CSS. Style sheets are discussed further in Part III in this book.