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Documents that contain a base-tag and mailto:-anchors are handled incorrectly. e.g. ... <base href="http://www.example.com/" /> ... <a href="mailto:john.doe@example.com">John Doe</a> ... is interpreted as: <a href="http://www.example.com/john.doe@example.com">John Doe</a> which of course does not exist... As per specification, only relative URIs are to be resolved using the base tag, and as far as i know mailto:john.doe@example.com is not a relative URI.