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'Foo' is a generic term often used when providing a generic example of code. Other common words include 'bar,' and 'baz.' There is no specific meaning in CSS assigned to any of these words. These types of words are often used for CSS class names, IDs, and attribute names and values. There is no case in which these values are meant to be taken literally.

For example, if someone is describing a selector, and says that you can select elements with an element that has a specific value, they might write the example as "foo[bar=baz]", which means that the CSS would select a 'foo' that has an attribute named 'bar' with a value of 'baz.'


HTML does not have a 'foo' element, nor is there any HTML attribute named 'bar.' While it is possible to construct an XML document that matches this type of signature, that would not likely ever be constructed in actual code other than an example.

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