What is the difference between a Class and an ID?
A Class definition can be used several times throughout your document, while an ID can only be used once. If you have a style that you want to apply several times throughout the document, you need to use a Class. However, it if only want to apply the style once (for instance, to position a particular element, such as a banner) you should use the ID. This is an especially import rule to follow if you plan to do any scripting on your page.
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