LayoutTests/imported/w3c/web-platform-tests/interfaces/web-nfc.idl

      dictionary NFCMessage {
        sequence<NFCRecord> records;
        USVString url;
      };

      typedef (DOMString or unrestricted double or ArrayBuffer or Dictionary) NFCRecordData;

      dictionary NFCRecord {
        NFCRecordType recordType;
        USVString mediaType;
        NFCRecordData data;
      };

        enum NFCRecordType {
          "empty",
          "text",
          "url",
          "json",
          "opaque"
        };

    partial interface Navigator {
      readonly attribute NFC nfc;
    };

    typedef (DOMString or ArrayBuffer or NFCMessage) NFCPushMessage;

    interface NFC {
      Promise<void> push(NFCPushMessage message, optional NFCPushOptions options);
      Promise<void> cancelPush(optional NFCPushTarget target="any");
      Promise<long> watch(MessageCallback callback, optional NFCWatchOptions options);
      Promise<void> cancelWatch(optional long id);
    };

    callback MessageCallback = void (NFCMessage message);

      dictionary NFCPushOptions {
        NFCPushTarget target = "any";
        unrestricted double timeout = Infinity;
        boolean ignoreRead = true;
      };

      enum NFCPushTarget {
        "tag",
        "peer",
        "any"
      };

        dictionary NFCWatchOptions {
          USVString url = "";
          NFCRecordType? recordType;
          USVString mediaType = "";
          NFCWatchMode mode = "web-nfc-only";
        };

      enum NFCWatchMode {
        "web-nfc-only",
        "any"
      };