WASHINGTON — Among social media spectators, anticipating what sort of handshake President Trump will deploy in his public interactions has become something of a sport.

Will Mr. Trump remain locked in a friendly death grip with another world leader, as he did on Friday with President Emmanuel Macron of France?

Will he try the old pull-and-pat maneuver, knocking his salutatory prey off balance, as he did with Neil M. Gorsuch, then a Supreme Court nominee?

Or will he completely miss (or ignore) the cue to shake hands, as he did with Chancellor Angela Merkel of Germany?