i3-config/layout/w3.json

{
    "border": "normal",
    "floating": "auto_off",
    "layout": "tabbed",
    "marks": [],
    "percent": 1,
    "type": "con",
    "nodes": [
        {
            "border": "none",
            "current_border_width": 2,
            "floating": "auto_off",
            "geometry": {
               "height": 1057,
               "width": 1920,
               "x": 0,
               "y": 0
            },
            "marks": [],
            "name": "kellya@salticus:~/projects/arachnitech/i3-config/layout",
            "percent": 1,
            "swallows": [
               {
                "class": "^kitty$"
               }
            ],
            "type": "con"
        }
    ]
}