page_down to option+down_arrow Complex Modification doesn't work

[jwhitley]

I'm trying to create a Complex Modification that "fixes" Safari's annoying behavior where the usual home, end, page_up, page_down key codes are ignored. Instead Safari maps those operations to command+up_arrow, command+down_arrow, option+up_arrow, option+down_arrow, respectively.

This has been giving me fits, as the modification simply does nothing. I have another Complex Modification setup that is currently working fine, which I've used for years now. Karabiner-EventViewer nor the Karabiner logs have provided any insight in the problem. I've reduced the problem down to a minimal non-working example:

{
  "description": "Fix Safari paging",
  "manipulators": [
    {
      "type": "basic",
      "from": {
        "key_code": "page_down",
        "modifiers": {
          "optional": [
            "any"
          ]
        }
      },
      "to": [
        {
          "key_code": "down_arrow",
          "modifiers": [
            "left_option"
          ]
        }
      ]
    }
  ]
}

After pouring over the documentation trying to find the issue, I also used a generator to re-create the same modification to make sure I wasn't missing something basic. The generated modification was identical to what I wrote by hand, above.