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Hyperlinks are styled by the user agent (e.g., a Web browser) by default.
These styles are usually set via a preference dialog, but could also be affected by a user stylesheet. Because these styles are explicitly assigned as though the UA had a stylesheet which read something like:
these styles override any inherited values for the same properties which are "pre-styled."
Therefore, in the case of some properties (usually color) authors must explicitly assign styles to hyperlinks in order to influence them.