The Base Element
•The base element (specified in the head— see pg. 76) is useful when a document is moved to a new folder.  Rather than rewriting all of the relative paths to reflect the document’s new location, the base element can redirect browsers to the document’s old location, allowing any relative paths to be resolved.
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•The base element is useful when you want to create a copy of a single page from a large Web site on another Web server.