A user may discover and navigate among hyperlinks through the use of a keyboard. For example, a user may press a tab key to discover and navigate to a first hyperlink that is part of a hypertext document. The first hyperlink is, in response, given focus and a focus shape is drawn around the text or graphics...http://www.google.ca/patents/US7673230?utm_source=gb-gplus-sharePatent US7673230 - Discoverability and navigation of hyperlinks via tabs
