CSS.layoutEditorChange

{
  "name": "layoutEditorChange",
  "parameters": [
    {
      "name": "styleSheetId",
      "$ref": "StyleSheetId",
      "description": "Identifier of the stylesheet where the modification occurred."
    },
    {
      "name": "changeRange",
      "$ref": "SourceRange",
      "description": "Range where the modification occurred."
    }
  ]
}