Keep in mind that if you use :all and you have stylesheets that redefine the same elements, only one will take precidence.
For example if a.css defines id "#top", b.css defines id "#top" and c.css defines id "#top", only one of these will actually be active in the browser, even though it will be listed in the cache css file.
This is only important if you are dynamically needing different CSS depending upon conditions set in your application (like sub-sites, user selected theming, etc).
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If you want specific files only or you need to specify the order you can do:
While surfing one of the rails blog i found using true %> in layout increases the performance of page loads
When i tried using it in my layout, i got cannot dup symbols error
Was bit curious is it a rails 2 feature or available in lower versions also?