By Shawn M. Lauriat
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Extra info for Advanced Ajax: Architecture and Best Practices
Even a small change, such as changing the h2s and h3s to styled divs, makes the maximum listening time explode to well over 1000 seconds; this difference occurs because changing out the heading tags for div removed the relationship between the sections of the page, thus removing the user’s ability to navigate between them. 32 Chapter 1 Usability Listening time varies greatly by the users’ settings in their screen reader, all of which have variable speeds. The measurements used in this section come from an analysis given normal, average settings.
Using non-semantic markup does not make it impossible to parse out the same elements, but the code and the performance of that code will suffer. Take the following two pairs of code samples, each having the content of an XHTML DOM for a simple blog and a corresponding script to change the background of the last element in every unordered list.
Lots of post text. Lots of post text. Lots of post text. text. Lots of post text. Lots of post text.
Even when the scripting does not have such pronounced differences, the impact can make itself quite clear in full-scale client-side applications. When the script suddenly works with hundreds (or even thousands) of elements, IE especially will have a considerable performance hit. Even taking away performance considerations for a moment, the second select() deﬁnition has greater complexity to it, and, as such, has more chances of breaking; in addition, it takes more work to change its behavior when necessary.