@Shelleyleo: I couldn't find a way to add attachments to a PM so I've posted to this thread instead.
I've attached a simple ePub with some <a> tags for testing and a screenshot showing how the links apprear on a PRS-300.
There are 5 links on the Contents page:
(1) Book Title - displays in white on black as the reader highlights the first link on the page.
(2) & (3) Less-Than and Greater-Than 'arrows' in the Contents header box which show in black on grey as per CSS.
(4) & (5) #1 and #2 links to Title Page and Introduction which show in black on white as per CSS.
As each link is hovered by arrowing down then the reader highlights it in reverse text, (white on black), and uses the CSS to unstyle the previously highlighted link.