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They don't seem to work in Firefox on Linux either (Ubuntu 20.04), seem to be Windows only for whatever reason.

• pwg 3y ago
  The two arrows work perfectly here with Slackware 15 and Firefox 102.9.0esr.
  • usr1106 3y ago
    They even work on the dinosaur age Firefox in Sailfish OS. I guess it's just whether the fonts used have the character or not, nothing to do with Firefox as such.
    • MayeulC 3y ago
      Probably, they don't show up on Firefox Android (Fennec on LineageOS 20)
      • efreak 3y ago
        Might be an Android thing. They don't show up in materialistic either, a native HN client.