{
  "properties": {},
  "syntaxes": {
    "bottom": { "syntax": "<length> | auto" },
    "left": { "syntax": "<length> | auto" },
    "right": { "syntax": "<length> | auto" },
    "top": { "syntax": "<length> | auto" },
    "url": { "syntax": "url( <string> <url-modifier>* ) | <url-token>" },
    "url-modifier": { "syntax": "<ident> | <function-token> <any-value> )" }
  }
}