mapcomplete/assets/layers/current_view/current_view.json

{
  "id": "current_view",
  "description": "A meta-layer which contains one single feature, namely the BBOX of the current map view. This can be used to trigger special actions. If a popup is defined for this layer, this popup will be accessible via an extra button on screen",
  "source": {
    "osmTags": "id=currentView"
  },
  "title": "Current View",
  "tagRenderings": [],
  "mapRendering": [
    {
      "color": "#cccc0088"
    }
  ]
}