By Christopher Schmitt
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Extra info for Adapting to Web Standards: CSS and Ajax for Big Sites
So now, many of those authors spend their time dealing with migrating from legacy markup to semantic markup. Several common scenarios may come up while migrating to Web standards in environments where legacy content and valid markup are mixed: ❖ Web standards means switching a Web site’s UI templates from an often com- plicated HTML TABLE structure to a layout using clean tagged elements without presentation attributes and CSS for positioning. However, some authors might insert a new, valid DTD at the top of an existing page whose design uses sliced images and a TABLE structure, only to discover that their layout shatters.
Com is broken. Adding back the DOCTYPE declaration is a simple thing in this case, but the lesson to be learned is that when widespread layout issues start happening, these problems are often symptomatic of a document-wide issue, such as the rendering mode, styles not being linked correctly, or missing tags in a sensitive location. Quirks mode in particular can wreak havoc on a well-structured page. Using a validation tool to check the syntax of the page can be a huge help in cases like this.
Based on unique needs, authors can link page-specific CSS files, and so forth. The biggest downside is that the site templates will require additional elements in the document’selement depending on what section of the site is being styled. Using a directory-based CSS structure rather than a modular structure provides a more robust and scalable CSS linking structure. Site section and Directory-based CSS Global CSS ﬁles Site Section CSS ﬁles Media CSS ﬁles Web pages Page level CSS ﬁles International CSS ﬁles Using this approach and routine evaluations of page-level files, authors can push the rules up to site sections and then ultimately to the global files.