by Eric A. Meyer
First edition, published May 2000.
(See the catalog page for this book.)
Search the text of Cascading Style Sheets: The Definitive Guide.
Let's consider once again a floated image which is floated to
the left, and which has left and top margins of
-15px . This image is placed inside a
Chapter 1: HTML and CSS
Chapter 2: Selectors and Structure
Chapter 3: Units and Values
Chapter 4: Text Properties
Chapter 5: Fonts
Chapter 6: Colors and Backgrounds
Chapter 7: Boxes and Borders
Chapter 8: Visual Formatting
Chapter 9: Positioning
Chapter 10: CSS2: A Look Ahead
Chapter 11: CSS in Action
Appendix A: CSS Resources
Appendix B: HTML 2.0 Style Sheet
Appendix C: CSS1 Properties
Appendix D: CSS Support Chart
Copyright © 2002 O'Reilly & Associates. All rights reserved.Web servers typically have 3- or 4-part names; the last two parts comprisethe registered domain name, e.g., udel.edu. Some webservers are configured as virtual hosts serving files under multipleserver names and domains.
The path and filename in a URL are typically specified from the rootof the web-server directory, which is some subdirectory of the server'slocal file system. For security reasons, browsers can't access stuffoutside the web-server directory.
URLs can specify files by relative or absolute path.
You can stop text wrapping by including a CLEAR attribute in a line-breaktag. Move your mouse over the image and you'll see the text that'sspecified in the ALT attribute.
Since the structure of the XML document can be specified in DTDs they provide a simple way to make it easier to exchange XML documents that conform to a DTD. For example, if two software systems need to exchange information, then if both of the systems conform to one DTD, the two systems can process information from each other. DTDs are not as powerful as some kind of schema architecture for XML, they don't support typing, subclassing, or instantiation mechanisms that a schema architecture must have.
DTDs are a simple way to make sure that 2 or more XML documents are of the same "type". Its a very limited approach to making "typed" XML documents shareable across systems. In the future some kind of schema system will be proposed by the W3C that should allow typing, instantiation and inheritance of information (in XML).