What does 'format' for wlr/taskbar do?

[ackstorm23]

It doesn't seem to matter what I put into format, all I get is an icon. {title} {name} {app_id} and {short_state} do not appear anywhere in the bar.

tooltip-format appears to set the tooltip, so what exactly should non-tooltip format be affecting?

    "wlr/taskbar": {
        "format": "{title} {name} {app_id}:{short_state}",
        "icon-size": 14,
        "icon-theme": "Numix-Circle",
        "tooltip-format": "{title}",
        "on-click": "activate",
        "on-click-middle": "close",
        "ignore-list": [
           "Alacritty"
        ],
        "app_ids-mapping": {
          "firefoxdeveloperedition": "firefox-developer-edition"
        },
        "rewrite": {
            "Firefox Web Browser": "Firefox",
            "Foot Server": "Terminal"
        }
    },

[ackstorm23]

Disregard