You can test-drive your CSS by viewing the source of this page and pasting the elements inside the <body> tag into your page’s main content area and/or a text widget in your sidebar(s).
Firebug works nicely for this purpose, too.
You can also link this page to your CSS style sheet to test whether your CSS selectors are global. Since the elements on this page are not nested inside your container elements, they will be unstyled if your selectors are overly-specific.
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