The best HTML/CSS invention since sliced bread, a simple coordinate system for web pages that elegantly solves the dreaded positioning problem:

Position and width of each div is specified using CSS classes defined in 960.css:
<div class="container_12">
<div class="grid_7 prefix_1">
<div class="grid_2 alpha">
...
</div>
<div class="grid_3">
...
</div>
<div class="grid_2 omega">
...
</div>
</div>
<div class="grid_3 suffix_1">
...
</div>
</div>
Links:
http://960.gs/demo.html
http://960.gs
http://www.designinfluences.com/fluid960gs - a derivative that elastically expands to the available width
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