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In the Web Development topics of forums across the Internet, many web developers trying to do the transition from table based layout (a 20th century relic) to CSS based layout have a problem giving up the grid. They go from a strictly controlled table grid to a grid made of div tags. To make such a grid structure work they need all kinds of hacks or end up with absolute positioning. The final structure is rigid and looks like a table. For some reason they think that is how a web page is supposed to look.
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This page has two floating layers. The first one is fixed to its location as defined by the inline code and the second is defined to float at the bottom of the screen by calculating an offset at load time. The strict doctype is require for it to work, otherwise you have to deal with quirks mode and the browsers do the positioning calculation differently and not to standard in quirks mode. The mouse scrollwheel will not work for some drivers. You have to use the slider on the screen
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One of the most common effects used on web pages is the image rollover. There are two problems associated with the effect:
First. They require a pre-load to work smoothly. That means scripting must be enabled, and each image must be separately addressed.
Secondly. The increase response times because of extra graphics have to be downloaded. Even if the graphics are small; there is still a separate request and disk I/O on the server 10 graphics that are 3k takes longer than 1 graphic that is 30k
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