Class and ID Selectors
So far, all of the selectors we’ve seen have been tied to specific elements. Class selectors and ID selectors give you the opportunity to target elements that you’ve named yourself, independent of the document element.
Elements are named using the class and id attributes. They
can be applied to all XHTML elements except base, head,
html, meta, script,
style, and title. In addition, class may not be used in basefont and param. Class and ID selectors work in slightly
different ways.
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