By Christopher Schmitt
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Extra resources for Adapting to Web Standards: CSS and Ajax for Big Sites
This page intentionally left blank 2 Presenting Cascading Style Sheets The presentation layer in Web standards-based Web sites is controlled by Cascading Style Sheets (hereafter referred to as CSS). When an author starts to build CSS files for a site, a number of factors should be consid- ered. These can run the gamut from how many style sheets to the organization of the files’ content, and even determining what it means to write efficient, scalable CSS. 48 ADAPTING TO WEB STANDARDS How Many CSS Files?
The old way of laying out a Web page involved complex nested tables and bloated code, which was difficult to run through and understand at a glance. In a standards-based solution, the layout of the page is controlled with CSS, but the structure of the page becomes a simple series of HTML elements. Since the basic structure is typically a series of elements with ID attributes, creating a naming system for the IDs organizes the code. Mapping the naming system back to the template inventory will help the whole Web team.
This approach will be examined more thoroughly in the upcoming section. Chapter Presenting Cascading Style Sheets This structure scales well and is easy for Web teams to manage. There are also fewer questions on the maintenance side as to where to put, as well as where to find, rules. Finally, there will be fewer HTTP requests than with multiple layers of linked CSS files. Merging Multiple CSS fi les Another technique worth consideration is merging multiple CSS files. This can be done during a build, deployment, or publishing process, or even in real time as the files are served to the browser.