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What is foo? I have seen it in many CSS and Web designing examples usually as a CSS class.
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"Foo" and "Bar" are names for variables, classes, whatever that have no meaning and are often used in examples.
foo is used as a place-holder name, usually in example code to signify that the object being named, or the choice of name, is not part of the crux of the example. foo is often followed by bar , baz , and even bundy , if more than one such name is needed.
What Does Foobar Mean? Foobar is a slang term used in the IT world as a placeholder to refer to generic examples or temporary files or programs that are to be deleted.
According to an Internet Engineering Task Force RFC, the word FOO originated as a nonsense word with its earliest documented use in the 1930s comic Smokey Stover by Bill Holman.
see 'foo' entry in jargon file.
http://www.catb.org/jargon/html/F/foo.html
esp. 2. [very common] Used very generally as a sample name for absolutely anything, esp. programs and files (esp. scratch files).
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