As someone else alluded to, Fn key presses can be weird - they could show up as ... | Hacker News

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rincebrain on March 11, 2016 | parent | context | favorite | on: Microsoft embeds nagware into IE patch

As someone else alluded to, Fn key presses can be weird - they could show up as novel key inputs, which xev would show you, or as odder things.

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