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ID:
id short for fragment identifier, is a beautiful attribute, but it's very easy to use them improperly. You can only use an ID name once in any XHTML or HTML document. Duplicate ID tags will cause your page to fail validation, and can have negative effects when using JavaScript with them.
Classes:
classes like ID's, can also be used to in JavaScript scripts, but unlike ID's, they can be used multiple times in the same HTML document.
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