Google’s John Mueller answered a question about links in the button element, confirming that Google can’t see them. Some SEOs have been hiding internal links in the button element in order to block PageRank from “unimportant” pages. Mueller’s answer seems to confirm that the tactic works.
PRG Pattern for Hiding Links from Google
The concept of the Post/Redirect/Get Pattern (PRG Pattern) for hiding links is the topic raised by the person asking the question and the answer given by John Mueller.