Hyperlinks and Pop-ups

How is this done?
Example article from Science Direct on Thesis Writing

In the HTML version, They have a little pop-up with the reference info when you hover over the citation.
In the PDF version, there's a hyperlink to the right bit of the Bibliography.

Can anyone think of a hack (or solution!) which would allow Zotero to do this?
  • not easily in the pdf version. A greasemonkey script on a per site basis may be feasable for some publishers pages
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