Karabiner Elements script to map [double tap left Cmd] to [Cmd+L] (to focus the address bar in Chrome)

double_tap_cmd_to_cmd_l.json

{"title": "Rules for Karabiner-Elements",
  "rules": [
    { "description": "Press left_command twice to send Cmd+L (Focus Address Bar in Chrome)",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "left_command",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "l",
              "modifiers": ["left_command"]
            }
          ],
          "conditions": [
            {
              "type": "variable_if",
              "name": "key pressed",
              "value": 1
            }
          ]
        },

        {
          "type": "basic",
          "from": {
            "key_code": "left_command",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "set_variable": {
                "name": "key pressed",
                "value": 1
              }
            },
            {
              "key_code": "left_command"
            }
          ],
          "description": "to_delayed_action is set to 400ms in karabiner.json",
          "to_delayed_action": {
            "to_if_invoked": [
              {
                "set_variable": {
                  "name": "key pressed",
                  "value": 0
                }
              }
            ],
            "to_if_canceled": [
              {
                "set_variable": {
                  "name": "key pressed",
                  "value": 0
                }
              }
            ]
          }
        }
      ]
    }
  ]
}