summaryrefslogtreecommitdiffstats
path: root/dom/base/nsINode.h
blob: d82f5f89909681de593e974d75e57776d0c53862 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsINode_h___
#define nsINode_h___

#include "mozilla/Likely.h"
#include "mozilla/ServoTypes.h"
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"               // for member, local
#include "nsGkAtoms.h"              // for nsGkAtoms::baseURIProperty
#include "nsIDOMNode.h"
#include "mozilla/dom/NodeInfo.h"            // member (in nsCOMPtr)
#include "nsIVariant.h"             // for use in GetUserData()
#include "nsNodeInfoManager.h"      // for use in NodePrincipal()
#include "nsPropertyTable.h"        // for typedefs
#include "nsTObserverArray.h"       // for member
#include "mozilla/ErrorResult.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/EventTarget.h" // for base class
#include "js/TypeDecls.h"     // for Handle, Value, JSObject, JSContext
#include "mozilla/dom/DOMString.h"
#include "mozilla/dom/BindingDeclarations.h"
#include <iosfwd>

// Including 'windows.h' will #define GetClassInfo to something else.
#ifdef XP_WIN
#ifdef GetClassInfo
#undef GetClassInfo
#endif
#endif

class nsAttrAndChildArray;
class nsChildContentList;
struct nsCSSSelectorList;
class nsDOMAttributeMap;
class nsIAnimationObserver;
class nsIContent;
class nsIDocument;
class nsIDOMElement;
class nsIDOMNodeList;
class nsIEditor;
class nsIFrame;
class nsIMutationObserver;
class nsINode;
class nsINodeList;
class nsIPresShell;
class nsIPrincipal;
class nsIURI;
class nsNodeSupportsWeakRefTearoff;
class nsNodeWeakReference;
class nsDOMMutationObserver;

namespace mozilla {
class EventListenerManager;
namespace dom {
/**
 * @return true if aChar is what the DOM spec defines as 'space character'.
 * http://dom.spec.whatwg.org/#space-character
 */
inline bool IsSpaceCharacter(char16_t aChar) {
  return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
         aChar == '\f';
}
inline bool IsSpaceCharacter(char aChar) {
  return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
         aChar == '\f';
}
class AccessibleNode;
struct BoxQuadOptions;
struct ConvertCoordinateOptions;
class DOMPoint;
class DOMQuad;
class DOMRectReadOnly;
class Element;
class EventHandlerNonNull;
template<typename T> class Optional;
class OwningNodeOrString;
template<typename> class Sequence;
class Text;
class TextOrElementOrDocument;
struct DOMPointInit;
} // namespace dom
} // namespace mozilla

#define NODE_FLAG_BIT(n_) \
  (nsWrapperCache::FlagsType(1U) << (WRAPPER_CACHE_FLAGS_BITS_USED + (n_)))

enum {
  // This bit will be set if the node has a listener manager.
  NODE_HAS_LISTENERMANAGER =              NODE_FLAG_BIT(0),

  // Whether this node has had any properties set on it
  NODE_HAS_PROPERTIES =                   NODE_FLAG_BIT(1),

  // Whether this node is the root of an anonymous subtree.  Note that this
  // need not be a native anonymous subtree.  Any anonymous subtree, including
  // XBL-generated ones, will do.  This flag is set-once: once a node has it,
  // it must not be removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_ANONYMOUS_ROOT =                NODE_FLAG_BIT(2),

  // Whether the node has some ancestor, possibly itself, that is native
  // anonymous.  This includes ancestors crossing XBL scopes, in cases when an
  // XBL binding is attached to an element which has a native anonymous
  // ancestor.  This flag is set-once: once a node has it, it must not be
  // removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE =          NODE_FLAG_BIT(3),

  // Whether this node is the root of a native anonymous (from the perspective
  // of its parent) subtree.  This flag is set-once: once a node has it, it
  // must not be removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_NATIVE_ANONYMOUS_ROOT =         NODE_FLAG_BIT(4),

  // Forces the XBL code to treat this node as if it were
  // in the document and therefore should get bindings attached.
  NODE_FORCE_XBL_BINDINGS =               NODE_FLAG_BIT(5),

  // Whether a binding manager may have a pointer to this
  NODE_MAY_BE_IN_BINDING_MNGR =           NODE_FLAG_BIT(6),

  NODE_IS_EDITABLE =                      NODE_FLAG_BIT(7),

  // For all Element nodes, NODE_MAY_HAVE_CLASS is guaranteed to be set if the
  // node in fact has a class, but may be set even if it doesn't.
  NODE_MAY_HAVE_CLASS =                   NODE_FLAG_BIT(8),

  // Whether the node participates in a shadow tree.
  NODE_IS_IN_SHADOW_TREE =                NODE_FLAG_BIT(9),

  // Node has an :empty or :-moz-only-whitespace selector
  NODE_HAS_EMPTY_SELECTOR =               NODE_FLAG_BIT(10),

  // A child of the node has a selector such that any insertion,
  // removal, or appending of children requires restyling the parent.
  NODE_HAS_SLOW_SELECTOR =                NODE_FLAG_BIT(11),

  // A child of the node has a :first-child, :-moz-first-node,
  // :only-child, :last-child or :-moz-last-node selector.
  NODE_HAS_EDGE_CHILD_SELECTOR =          NODE_FLAG_BIT(12),

  // A child of the node has a selector such that any insertion or
  // removal of children requires restyling later siblings of that
  // element.  Additionally (in this manner it is stronger than
  // NODE_HAS_SLOW_SELECTOR), if a child's style changes due to any
  // other content tree changes (e.g., the child changes to or from
  // matching :empty due to a grandchild insertion or removal), the
  // child's later siblings must also be restyled.
  NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS = NODE_FLAG_BIT(13),

  NODE_ALL_SELECTOR_FLAGS =               NODE_HAS_EMPTY_SELECTOR |
                                          NODE_HAS_SLOW_SELECTOR |
                                          NODE_HAS_EDGE_CHILD_SELECTOR |
                                          NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS,

  // This node needs to go through frame construction to get a frame (or
  // undisplayed entry).
  NODE_NEEDS_FRAME =                      NODE_FLAG_BIT(14),

  // At least one descendant in the flattened tree has NODE_NEEDS_FRAME set.
  // This should be set on every node on the flattened tree path between the
  // node(s) with NODE_NEEDS_FRAME and the root content.
  NODE_DESCENDANTS_NEED_FRAMES =          NODE_FLAG_BIT(15),

  // Set if the node has the accesskey attribute set.
  NODE_HAS_ACCESSKEY =                    NODE_FLAG_BIT(16),

  // Set if the node has right-to-left directionality
  NODE_HAS_DIRECTION_RTL =                NODE_FLAG_BIT(17),

  // Set if the node has left-to-right directionality
  NODE_HAS_DIRECTION_LTR =                NODE_FLAG_BIT(18),

  NODE_ALL_DIRECTION_FLAGS =              NODE_HAS_DIRECTION_LTR |
                                          NODE_HAS_DIRECTION_RTL,

  NODE_CHROME_ONLY_ACCESS =               NODE_FLAG_BIT(19),

  NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS =    NODE_FLAG_BIT(20),

  // These two bits are shared by Gecko's and Servo's restyle systems for
  // different purposes. They should not be accessed directly, and access to
  // them should be properly guarded by asserts.
  NODE_SHARED_RESTYLE_BIT_1 =             NODE_FLAG_BIT(21),
  NODE_SHARED_RESTYLE_BIT_2 =             NODE_FLAG_BIT(22),

  // Whether this node is dirty for Servo's style system.
  NODE_IS_DIRTY_FOR_SERVO =               NODE_SHARED_RESTYLE_BIT_1,

  // Whether this node has dirty descendants for Servo's style system.
  NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO =  NODE_SHARED_RESTYLE_BIT_2,

  // Remaining bits are node type specific.
  NODE_TYPE_SPECIFIC_BITS_OFFSET =        23
};

// Make sure we have space for our bits
#define ASSERT_NODE_FLAGS_SPACE(n) \
  static_assert(WRAPPER_CACHE_FLAGS_BITS_USED + (n) <=                          \
                  sizeof(nsWrapperCache::FlagsType) * 8,                        \
                "Not enough space for our bits")
ASSERT_NODE_FLAGS_SPACE(NODE_TYPE_SPECIFIC_BITS_OFFSET);

/**
 * Class used to detect unexpected mutations. To use the class create an
 * nsMutationGuard on the stack before unexpected mutations could occur.
 * You can then at any time call Mutated to check if any unexpected mutations
 * have occurred.
 */
class nsMutationGuard {
public:
  nsMutationGuard()
  {
    mStartingGeneration = sGeneration;
  }

  /**
   * Returns true if any unexpected mutations have occurred. You can pass in
   * an 8-bit ignore count to ignore a number of expected mutations.
   *
   * We don't need to care about overflow because subtraction of uint64_t's is
   * finding the difference between two elements of the group Z < 2^64.  Once
   * we know the difference between two elements we only need to check that is
   * less than the given number of mutations to know less than that many
   * mutations occured.  Assuming constant 1ns mutations it would take 584
   * years for sGeneration to fully wrap around so we can ignore a guard living
   * through a full wrap around.
   */
  bool Mutated(uint8_t aIgnoreCount)
  {
    return (sGeneration - mStartingGeneration) > aIgnoreCount;
  }

  // This function should be called whenever a mutation that we want to keep
  // track of happen. For now this is only done when children are added or
  // removed, but we might do it for attribute changes too in the future.
  static void DidMutate()
  {
    sGeneration++;
  }

private:
  // This is the value sGeneration had when the guard was constructed.
  uint64_t mStartingGeneration;

  // This value is incremented on every mutation, for the life of the process.
  static uint64_t sGeneration;
};

// This should be used for any nsINode sub-class that has fields of its own
// that it needs to measure;  any sub-class that doesn't use it will inherit
// SizeOfExcludingThis from its super-class.  SizeOfIncludingThis() need not be
// defined, it is inherited from nsINode.
// This macro isn't actually specific to nodes, and bug 956400 will move it into MFBT.
#define NS_DECL_SIZEOF_EXCLUDING_THIS \
  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const override;

// Categories of node properties
// 0 is global.
#define DOM_USER_DATA         1
#define SMIL_MAPPED_ATTR_ANIMVAL 2

// IID for the nsINode interface
#define NS_INODE_IID \
{ 0x70ba4547, 0x7699, 0x44fc, \
  { 0xb3, 0x20, 0x52, 0xdb, 0xe3, 0xd1, 0xf9, 0x0a } }

/**
 * An internal interface that abstracts some DOMNode-related parts that both
 * nsIContent and nsIDocument share.  An instance of this interface has a list
 * of nsIContent children and provides access to them.
 */
class nsINode : public mozilla::dom::EventTarget
{
public:
  typedef mozilla::dom::BoxQuadOptions BoxQuadOptions;
  typedef mozilla::dom::ConvertCoordinateOptions ConvertCoordinateOptions;
  typedef mozilla::dom::DOMPoint DOMPoint;
  typedef mozilla::dom::DOMPointInit DOMPointInit;
  typedef mozilla::dom::DOMQuad DOMQuad;
  typedef mozilla::dom::DOMRectReadOnly DOMRectReadOnly;
  typedef mozilla::dom::OwningNodeOrString OwningNodeOrString;
  typedef mozilla::dom::TextOrElementOrDocument TextOrElementOrDocument;
  typedef mozilla::ErrorResult ErrorResult;

  template<class T>
  using Sequence = mozilla::dom::Sequence<T>;

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID)

  // Among the sub-classes that inherit (directly or indirectly) from nsINode,
  // measurement of the following members may be added later if DMD finds it is
  // worthwhile:
  // - nsGenericHTMLElement:  mForm, mFieldSet
  // - nsGenericHTMLFrameElement: mFrameLoader (bug 672539)
  // - HTMLBodyElement:       mContentStyleRule
  // - HTMLDataListElement:   mOptions
  // - HTMLFieldSetElement:   mElements, mDependentElements, mFirstLegend
  // - HTMLFormElement:       many!
  // - HTMLFrameSetElement:   mRowSpecs, mColSpecs
  // - HTMLInputElement:      mInputData, mFiles, mFileList, mStaticDocfileList
  // - nsHTMLMapElement:      mAreas
  // - HTMLMediaElement:      many!
  // - nsHTMLOutputElement:   mDefaultValue, mTokenList
  // - nsHTMLRowElement:      mCells
  // - nsHTMLSelectElement:   mOptions, mRestoreState
  // - nsHTMLTableElement:    mTBodies, mRows, mTableInheritedAttributes
  // - nsHTMLTableSectionElement: mRows
  // - nsHTMLTextAreaElement: mControllers, mState
  //
  // The following members don't need to be measured:
  // - nsIContent: mPrimaryFrame, because it's non-owning and measured elsewhere
  //
  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

  // SizeOfIncludingThis doesn't need to be overridden by sub-classes because
  // sub-classes of nsINode are guaranteed to be laid out in memory in such a
  // way that |this| points to the start of the allocated object, even in
  // methods of nsINode's sub-classes, and so |aMallocSizeOf(this)| is always
  // safe to call no matter which object it was invoked on.
  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }

  friend class nsNodeUtils;
  friend class nsNodeWeakReference;
  friend class nsNodeSupportsWeakRefTearoff;
  friend class nsAttrAndChildArray;

#ifdef MOZILLA_INTERNAL_API
  explicit nsINode(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
  : mNodeInfo(aNodeInfo)
  , mParent(nullptr)
  , mBoolFlags(0)
  , mNextSibling(nullptr)
  , mPreviousSibling(nullptr)
  , mFirstChild(nullptr)
  , mSubtreeRoot(this)
  , mSlots(nullptr)
  {
  }
#endif

  virtual ~nsINode();

  /**
   * Bit-flags to pass (or'ed together) to IsNodeOfType()
   */
  enum {
    /** nsIContent nodes */
    eCONTENT             = 1 << 0,
    /** nsIDocument nodes */
    eDOCUMENT            = 1 << 1,
    /** nsIAttribute nodes */
    eATTRIBUTE           = 1 << 2,
    /** text nodes */
    eTEXT                = 1 << 3,
    /** xml processing instructions */
    ePROCESSING_INSTRUCTION = 1 << 4,
    /** comment nodes */
    eCOMMENT             = 1 << 5,
    /** form control elements */
    eHTML_FORM_CONTROL   = 1 << 6,
    /** document fragments */
    eDOCUMENT_FRAGMENT   = 1 << 7,
    /** data nodes (comments, PIs, text). Nodes of this type always
     returns a non-null value for nsIContent::GetText() */
    eDATA_NODE           = 1 << 8,
    /** HTMLMediaElement */
    eMEDIA               = 1 << 9,
    /** animation elements */
    eANIMATION           = 1 << 10,
    /** filter elements that implement SVGFilterPrimitiveStandardAttributes */
    eFILTER              = 1 << 11
  };

  /**
   * API for doing a quick check if a content is of a given
   * type, such as Text, Document, Comment ...  Use this when you can instead of
   * checking the tag.
   *
   * @param aFlags what types you want to test for (see above)
   * @return whether the content matches ALL flags passed in
   */
  virtual bool IsNodeOfType(uint32_t aFlags) const = 0;

  virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;

  /**
   * returns true if we are in priviliged code or
   * layout.css.getBoxQuads.enabled == true.
   */
  static bool HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */);

protected:
  /**
   * WrapNode is called from WrapObject to actually wrap this node, WrapObject
   * does some additional checks and fix-up that's common to all nodes. WrapNode
   * should just call the DOM binding's Wrap function.
   *
   * aGivenProto is the prototype to use (or null if the default one should be
   * used) and should just be passed directly on to the DOM binding's Wrap
   * function.
   */
  virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) = 0;

public:
  mozilla::dom::ParentObject GetParentObject() const; // Implemented in nsIDocument.h

  /**
   * Return the scope chain parent for this node, for use in things
   * like event handler compilation.  Returning null means to use the
   * global object as the scope chain parent.
   */
  virtual nsINode* GetScopeChainParent() const;

  /**
   * Return whether the node is an Element node
   */
  bool IsElement() const {
    return GetBoolFlag(NodeIsElement);
  }

  /**
   * Return this node as an Element.  Should only be used for nodes
   * for which IsElement() is true.  This is defined inline in Element.h.
   */
  mozilla::dom::Element* AsElement();
  const mozilla::dom::Element* AsElement() const;

  /**
   * Return this node as nsIContent.  Should only be used for nodes for which
   * IsContent() is true.  This is defined inline in nsIContent.h.
   */
  nsIContent* AsContent();
  const nsIContent* AsContent() const
  {
    return const_cast<nsINode*>(this)->AsContent();
  }

  /**
   * Return this node as Text if it is one, otherwise null.  This is defined
   * inline in Text.h.
   */
  mozilla::dom::Text* GetAsText();
  const mozilla::dom::Text* GetAsText() const;

  virtual nsIDOMNode* AsDOMNode() = 0;

  /**
   * Return if this node has any children.
   */
  bool HasChildren() const { return !!mFirstChild; }

  /**
   * Get the number of children
   * @return the number of children
   */
  virtual uint32_t GetChildCount() const = 0;

  /**
   * Get a child by index
   * @param aIndex the index of the child to get
   * @return the child, or null if index out of bounds
   */
  virtual nsIContent* GetChildAt(uint32_t aIndex) const = 0;

  /**
   * Get a raw pointer to the child array.  This should only be used if you
   * plan to walk a bunch of the kids, promise to make sure that nothing ever
   * mutates (no attribute changes, not DOM tree changes, no script execution,
   * NOTHING), and will never ever peform an out-of-bounds access here.  This
   * method may return null if there are no children, or it may return a
   * garbage pointer.  In all cases the out param will be set to the number of
   * children.
   */
  virtual nsIContent * const * GetChildArray(uint32_t* aChildCount) const = 0;

  /**
   * Get the index of a child within this content
   * @param aPossibleChild the child to get the index of.
   * @return the index of the child, or -1 if not a child
   *
   * If the return value is not -1, then calling GetChildAt() with that value
   * will return aPossibleChild.
   */
  virtual int32_t IndexOf(const nsINode* aPossibleChild) const = 0;

  /**
   * Returns the "node document" of this node.
   *
   * https://dom.spec.whatwg.org/#concept-node-document
   *
   * Note that in the case that this node is a document node this method
   * will return |this|.  That is different to the Node.ownerDocument DOM
   * attribute (implemented by nsINode::GetOwnerDocument) which is specified to
   * be null in that case:
   *
   * https://dom.spec.whatwg.org/#dom-node-ownerdocument
   *
   * For all other cases OwnerDoc and GetOwnerDocument behave identically.
   */
  nsIDocument *OwnerDoc() const
  {
    return mNodeInfo->GetDocument();
  }

  /**
   * Return the "owner document" of this node as an nsINode*.  Implemented
   * in nsIDocument.h.
   */
  nsINode *OwnerDocAsNode() const;

  /**
   * Returns true if the content has an ancestor that is a document.
   *
   * @return whether this content is in a document tree
   */
  bool IsInUncomposedDoc() const
  {
    return GetBoolFlag(IsInDocument);
  }

  /**
   * Get the document that this content is currently in, if any. This will be
   * null if the content has no ancestor that is a document.
   *
   * @return the current document
   */

  nsIDocument* GetUncomposedDoc() const
  {
    return IsInUncomposedDoc() ? OwnerDoc() : nullptr;
  }

  /**
   * This method returns the owner doc if the node is in the
   * composed document (as defined in the Shadow DOM spec), otherwise
   * it returns null.
   */
  nsIDocument* GetComposedDoc() const
  {
    return IsInShadowTree() ?
      GetComposedDocInternal() : GetUncomposedDoc();
  }

  /**
   * Returns true if GetComposedDoc() would return a non-null value.
   */
  bool IsInComposedDoc() const
  {
    return IsInUncomposedDoc() || (IsInShadowTree() && GetComposedDocInternal());
  }

  /**
   * The values returned by this function are the ones defined for
   * nsIDOMNode.nodeType
   */
  uint16_t NodeType() const
  {
    return mNodeInfo->NodeType();
  }
  const nsString& NodeName() const
  {
    return mNodeInfo->NodeName();
  }
  const nsString& LocalName() const
  {
    return mNodeInfo->LocalName();
  }

  /**
   * Get the NodeInfo for this element
   * @return the nodes node info
   */
  inline mozilla::dom::NodeInfo* NodeInfo() const
  {
    return mNodeInfo;
  }

  inline bool IsInNamespace(int32_t aNamespace) const
  {
    return mNodeInfo->NamespaceID() == aNamespace;
  }

  /**
   * Print a debugger friendly descriptor of this element. This will describe
   * the position of this element in the document.
   */
  friend std::ostream& operator<<(std::ostream& aStream, const nsINode& aNode);

protected:
  // These 2 methods are useful for the recursive templates IsHTMLElement,
  // IsSVGElement, etc.
  inline bool IsNodeInternal() const
  {
    return false;
  }

  template<typename First, typename... Args>
  inline bool IsNodeInternal(First aFirst, Args... aArgs) const
  {
    return mNodeInfo->Equals(aFirst) || IsNodeInternal(aArgs...);
  }

public:
  inline bool IsHTMLElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_XHTML);
  }

  inline bool IsHTMLElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XHTML);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfHTMLElements(First aFirst, Args... aArgs) const
  {
    return IsHTMLElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsSVGElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_SVG);
  }

  inline bool IsSVGElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_SVG);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfSVGElements(First aFirst, Args... aArgs) const
  {
    return IsSVGElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsXULElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_XUL);
  }

  inline bool IsXULElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XUL);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfXULElements(First aFirst, Args... aArgs) const
  {
    return IsXULElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsMathMLElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_MathML);
  }

  inline bool IsMathMLElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_MathML);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfMathMLElements(First aFirst, Args... aArgs) const
  {
    return IsMathMLElement() && IsNodeInternal(aFirst, aArgs...);
  }

  /**
   * Insert a content node at a particular index.  This method handles calling
   * BindToTree on the child appropriately.
   *
   * @param aKid the content to insert
   * @param aIndex the index it is being inserted at (the index it will have
   *        after it is inserted)
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the insert has
   *        occurred
   *
   * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
   * than one element node as a child of a document.  Doing this will also
   * assert -- you shouldn't be doing it!  Check with
   * nsIDocument::GetRootElement() first if you're not sure.  Apart from this
   * one constraint, this doesn't do any checking on whether aKid is a valid
   * child of |this|.
   *
   * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
   */
  virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
                                 bool aNotify) = 0;

  /**
   * Append a content node to the end of the child list.  This method handles
   * calling BindToTree on the child appropriately.
   *
   * @param aKid the content to append
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the append has
   *        occurred
   *
   * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
   * than one element node as a child of a document.  Doing this will also
   * assert -- you shouldn't be doing it!  Check with
   * nsIDocument::GetRootElement() first if you're not sure.  Apart from this
   * one constraint, this doesn't do any checking on whether aKid is a valid
   * child of |this|.
   *
   * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
   */
  nsresult AppendChildTo(nsIContent* aKid, bool aNotify)
  {
    return InsertChildAt(aKid, GetChildCount(), aNotify);
  }

  /**
   * Remove a child from this node.  This method handles calling UnbindFromTree
   * on the child appropriately.
   *
   * @param aIndex the index of the child to remove
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the remove has
   *        occurred
   *
   * Note: If there is no child at aIndex, this method will simply do nothing.
   */
  virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) = 0;

  /**
   * Get a property associated with this node.
   *
   * @param aPropertyName  name of property to get.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* GetProperty(nsIAtom *aPropertyName,
                    nsresult *aStatus = nullptr) const
  {
    return GetProperty(0, aPropertyName, aStatus);
  }

  /**
   * Get a property associated with this node.
   *
   * @param aCategory      category of property to get.
   * @param aPropertyName  name of property to get.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* GetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
                    nsresult *aStatus = nullptr) const;

  /**
   * Set a property to be associated with this node. This will overwrite an
   * existing value if one exists. The existing value is destroyed using the
   * destructor function given when that value was set.
   *
   * @param aPropertyName  name of property to set.
   * @param aValue         new value of property.
   * @param aDtor          destructor function to be used when this property
   *                       is destroyed.
   * @param aTransfer      if true the property will not be deleted when the
   *                       ownerDocument of the node changes, if false it
   *                       will be deleted.
   *
   * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
   *                                       was already set
   * @throws NS_ERROR_OUT_OF_MEMORY if that occurs
   */
  nsresult SetProperty(nsIAtom *aPropertyName, void *aValue,
                       NSPropertyDtorFunc aDtor = nullptr,
                       bool aTransfer = false)
  {
    return SetProperty(0, aPropertyName, aValue, aDtor, aTransfer);
  }

  /**
   * Set a property to be associated with this node. This will overwrite an
   * existing value if one exists. The existing value is destroyed using the
   * destructor function given when that value was set.
   *
   * @param aCategory       category of property to set.
   * @param aPropertyName   name of property to set.
   * @param aValue          new value of property.
   * @param aDtor           destructor function to be used when this property
   *                        is destroyed.
   * @param aTransfer       if true the property will not be deleted when the
   *                        ownerDocument of the node changes, if false it
   *                        will be deleted.
   * @param aOldValue [out] previous value of property.
   *
   * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
   *                                       was already set
   * @throws NS_ERROR_OUT_OF_MEMORY if that occurs
   */
  nsresult SetProperty(uint16_t aCategory,
                       nsIAtom *aPropertyName, void *aValue,
                       NSPropertyDtorFunc aDtor = nullptr,
                       bool aTransfer = false,
                       void **aOldValue = nullptr);

  /**
   * A generic destructor for property values allocated with new.
   */
  template<class T>
  static void DeleteProperty(void *, nsIAtom *, void *aPropertyValue, void *)
  {
    delete static_cast<T *>(aPropertyValue);
  }

  /**
   * Destroys a property associated with this node. The value is destroyed
   * using the destruction function given when that value was set.
   *
   * @param aPropertyName  name of property to destroy.
   */
  void DeleteProperty(nsIAtom *aPropertyName)
  {
    DeleteProperty(0, aPropertyName);
  }

  /**
   * Destroys a property associated with this node. The value is destroyed
   * using the destruction function given when that value was set.
   *
   * @param aCategory      category of property to destroy.
   * @param aPropertyName  name of property to destroy.
   */
  void DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName);

  /**
   * Unset a property associated with this node. The value will not be
   * destroyed but rather returned. It is the caller's responsibility to
   * destroy the value after that point.
   *
   * @param aPropertyName  name of property to unset.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* UnsetProperty(nsIAtom  *aPropertyName,
                      nsresult *aStatus = nullptr)
  {
    return UnsetProperty(0, aPropertyName, aStatus);
  }

  /**
   * Unset a property associated with this node. The value will not be
   * destroyed but rather returned. It is the caller's responsibility to
   * destroy the value after that point.
   *
   * @param aCategory      category of property to unset.
   * @param aPropertyName  name of property to unset.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* UnsetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
                      nsresult *aStatus = nullptr);

  bool HasProperties() const
  {
    return HasFlag(NODE_HAS_PROPERTIES);
  }

  /**
   * Return the principal of this node.  This is guaranteed to never be a null
   * pointer.
   */
  nsIPrincipal* NodePrincipal() const {
    return mNodeInfo->NodeInfoManager()->DocumentPrincipal();
  }

  /**
   * Get the parent nsIContent for this node.
   * @return the parent, or null if no parent or the parent is not an nsIContent
   */
  nsIContent* GetParent() const {
    return MOZ_LIKELY(GetBoolFlag(ParentIsContent)) ?
      reinterpret_cast<nsIContent*>(mParent) : nullptr;
  }

  /**
   * Get the parent nsINode for this node. This can be either an nsIContent,
   * an nsIDocument or an nsIAttribute.
   * @return the parent node
   */
  nsINode* GetParentNode() const
  {
    return mParent;
  }

  /**
   * Returns the node that is the parent of this node in the flattened
   * tree. This differs from the normal parent if the node is filtered
   * into an insertion point, or if the node is a direct child of a
   * shadow root.
   *
   * @return the flattened tree parent
   */
  inline nsINode* GetFlattenedTreeParentNode() const;

  /**
   * Get the parent nsINode for this node if it is an Element.
   * @return the parent node
   */
  mozilla::dom::Element* GetParentElement() const
  {
    return mParent && mParent->IsElement() ? mParent->AsElement() : nullptr;
  }

  /**
   * Get the parent Element of this node, traversing over a ShadowRoot
   * to its host if necessary.
   */
  mozilla::dom::Element* GetParentElementCrossingShadowRoot() const;

  /**
   * Get the root of the subtree this node belongs to.  This never returns
   * null.  It may return 'this' (e.g. for document nodes, and nodes that
   * are the roots of disconnected subtrees).
   */
  nsINode* SubtreeRoot() const;

  nsINode* RootNode() const
  {
    return SubtreeRoot();
  }

  /**
   * See nsIDOMEventTarget
   */
  NS_DECL_NSIDOMEVENTTARGET

  virtual mozilla::EventListenerManager*
    GetExistingListenerManager() const override;
  virtual mozilla::EventListenerManager*
    GetOrCreateListenerManager() override;

  using mozilla::dom::EventTarget::RemoveEventListener;
  using nsIDOMEventTarget::AddEventListener;
  virtual void AddEventListener(const nsAString& aType,
                                mozilla::dom::EventListener* aListener,
                                const mozilla::dom::AddEventListenerOptionsOrBoolean& aOptions,
                                const mozilla::dom::Nullable<bool>& aWantsUntrusted,
                                mozilla::ErrorResult& aRv) override;
  using nsIDOMEventTarget::AddSystemEventListener;

  virtual bool IsApzAware() const override;

  virtual nsPIDOMWindowOuter* GetOwnerGlobalForBindings() override;
  virtual nsIGlobalObject* GetOwnerGlobal() const override;

  /**
   * Returns true if this is a node belonging to a document that uses the Servo
   * style system.
   */
#ifdef MOZ_STYLO
  bool IsStyledByServo() const;
#else
  bool IsStyledByServo() const { return false; }
#endif

  bool IsDirtyForServo() const
  {
    MOZ_ASSERT(IsStyledByServo());
    return HasFlag(NODE_IS_DIRTY_FOR_SERVO);
  }

  bool HasDirtyDescendantsForServo() const
  {
    MOZ_ASSERT(IsStyledByServo());
    return HasFlag(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
  }

  void SetIsDirtyForServo() {
    MOZ_ASSERT(IsStyledByServo());
    SetFlags(NODE_IS_DIRTY_FOR_SERVO);
  }

  void SetHasDirtyDescendantsForServo() {
    MOZ_ASSERT(IsStyledByServo());
    SetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
  }

  void SetIsDirtyAndHasDirtyDescendantsForServo() {
    MOZ_ASSERT(IsStyledByServo());
    SetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO | NODE_IS_DIRTY_FOR_SERVO);
  }

  void UnsetIsDirtyForServo() {
    MOZ_ASSERT(IsStyledByServo());
    UnsetFlags(NODE_IS_DIRTY_FOR_SERVO);
  }

  void UnsetHasDirtyDescendantsForServo() {
    MOZ_ASSERT(IsStyledByServo());
    UnsetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
  }

  void UnsetIsDirtyAndHasDirtyDescendantsForServo() {
    MOZ_ASSERT(IsStyledByServo());
    UnsetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO | NODE_IS_DIRTY_FOR_SERVO);
  }

  inline void UnsetRestyleFlagsIfGecko();

  /**
   * Adds a mutation observer to be notified when this node, or any of its
   * descendants, are modified. The node will hold a weak reference to the
   * observer, which means that it is the responsibility of the observer to
   * remove itself in case it dies before the node.  If an observer is added
   * while observers are being notified, it may also be notified.  In general,
   * adding observers while inside a notification is not a good idea.  An
   * observer that is already observing the node must not be added without
   * being removed first.
   *
   * For mutation observers that implement nsIAnimationObserver, use
   * AddAnimationObserver instead.
   */
  void AddMutationObserver(nsIMutationObserver* aMutationObserver)
  {
    nsSlots* s = Slots();
    NS_ASSERTION(s->mMutationObservers.IndexOf(aMutationObserver) ==
                 nsTArray<int>::NoIndex,
                 "Observer already in the list");
    s->mMutationObservers.AppendElement(aMutationObserver);
  }

  /**
   * Same as above, but only adds the observer if its not observing
   * the node already.
   *
   * For mutation observers that implement nsIAnimationObserver, use
   * AddAnimationObserverUnlessExists instead.
   */
  void AddMutationObserverUnlessExists(nsIMutationObserver* aMutationObserver)
  {
    nsSlots* s = Slots();
    s->mMutationObservers.AppendElementUnlessExists(aMutationObserver);
  }

  /**
   * Same as AddMutationObserver, but for nsIAnimationObservers.  This
   * additionally records on the document that animation observers have
   * been registered, which is used to determine whether notifications
   * must be fired when animations are added, removed or changed.
   */
  void AddAnimationObserver(nsIAnimationObserver* aAnimationObserver);

  /**
   * Same as above, but only adds the observer if its not observing
   * the node already.
   */
  void AddAnimationObserverUnlessExists(nsIAnimationObserver* aAnimationObserver);

  /**
   * Removes a mutation observer.
   */
  void RemoveMutationObserver(nsIMutationObserver* aMutationObserver)
  {
    nsSlots* s = GetExistingSlots();
    if (s) {
      s->mMutationObservers.RemoveElement(aMutationObserver);
    }
  }

  /**
   * Clones this node. This needs to be overriden by all node classes. aNodeInfo
   * should be identical to this node's nodeInfo, except for the document which
   * may be different. When cloning an element, all attributes of the element
   * will be cloned. The children of the node will not be cloned.
   *
   * @param aNodeInfo the nodeinfo to use for the clone
   * @param aResult the clone
   */
  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const = 0;

  // This class can be extended by subclasses that wish to store more
  // information in the slots.
  class nsSlots
  {
  public:
    nsSlots();

    // If needed we could remove the vtable pointer this dtor causes by
    // putting a DestroySlots function on nsINode
    virtual ~nsSlots();

    void Traverse(nsCycleCollectionTraversalCallback &cb);
    void Unlink();

    /**
     * A list of mutation observers
     */
    nsTObserverArray<nsIMutationObserver*> mMutationObservers;

    /**
     * An object implementing nsIDOMNodeList for this content (childNodes)
     * @see nsIDOMNodeList
     * @see nsGenericHTMLElement::GetChildNodes
     */
    RefPtr<nsChildContentList> mChildNodes;

    /**
     * Weak reference to this node.  This is cleared by the destructor of
     * nsNodeWeakReference.
     */
    nsNodeWeakReference* MOZ_NON_OWNING_REF mWeakReference;

    /**
     * Number of descendant nodes in the uncomposed document that have been
     * explicitly set as editable.
     */
    uint32_t mEditableDescendantCount;
  };

  /**
   * Functions for managing flags and slots
   */
#ifdef DEBUG
  nsSlots* DebugGetSlots()
  {
    return Slots();
  }
#endif

  void SetFlags(FlagsType aFlagsToSet)
  {
    NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS_ROOT |
                                  NODE_IS_NATIVE_ANONYMOUS_ROOT |
                                  NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
                                  NODE_DESCENDANTS_NEED_FRAMES |
                                  NODE_NEEDS_FRAME |
                                  NODE_CHROME_ONLY_ACCESS)) ||
                 IsNodeOfType(eCONTENT),
                 "Flag only permitted on nsIContent nodes");
    nsWrapperCache::SetFlags(aFlagsToSet);
  }

  void UnsetFlags(FlagsType aFlagsToUnset)
  {
    NS_ASSERTION(!(aFlagsToUnset &
                   (NODE_IS_ANONYMOUS_ROOT |
                    NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
                    NODE_IS_NATIVE_ANONYMOUS_ROOT)),
                 "Trying to unset write-only flags");
    nsWrapperCache::UnsetFlags(aFlagsToUnset);
  }

  void ChangeEditableDescendantCount(int32_t aDelta);

  /**
   * Returns the count of descendant nodes in the uncomposed
   * document that are explicitly set as editable.
   */
  uint32_t EditableDescendantCount();

  /**
   * Sets the editable descendant count to 0. The editable
   * descendant count only counts explicitly editable nodes
   * that are in the uncomposed document so this method
   * should be called when nodes are are removed from it.
   */
  void ResetEditableDescendantCount();

  void SetEditableFlag(bool aEditable)
  {
    if (aEditable) {
      SetFlags(NODE_IS_EDITABLE);
    }
    else {
      UnsetFlags(NODE_IS_EDITABLE);
    }
  }

  bool IsEditable() const
  {
#ifdef MOZILLA_INTERNAL_API
    return IsEditableInternal();
#else
    return IsEditableExternal();
#endif
  }

  /**
   * Returns true if |this| or any of its ancestors is native anonymous.
   */
  bool IsInNativeAnonymousSubtree() const
  {
#ifdef DEBUG
    if (HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE)) {
      return true;
    }
    CheckNotNativeAnonymous();
    return false;
#else
    return HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE);
#endif
  }

  bool IsInAnonymousSubtree() const;

  // Note: This asserts |IsInAnonymousSubtree()|.
  bool IsAnonymousContentInSVGUseSubtree() const;

  // True for native anonymous content and for XBL content if the binding
  // has chromeOnlyContent="true".
  bool ChromeOnlyAccess() const
  {
    return HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE | NODE_CHROME_ONLY_ACCESS);
  }

  bool IsInShadowTree() const
  {
    return HasFlag(NODE_IS_IN_SHADOW_TREE);
  }

  /**
   * Returns true if |this| node is the common ancestor of the start/end
   * nodes of a Range in a Selection or a descendant of such a common ancestor.
   * This node is definitely not selected when |false| is returned, but it may
   * or may not be selected when |true| is returned.
   */
  bool IsSelectionDescendant() const
  {
    return IsDescendantOfCommonAncestorForRangeInSelection() ||
           IsCommonAncestorForRangeInSelection();
  }

  /**
   * Get the root content of an editor. So, this node must be a descendant of
   * an editor. Note that this should be only used for getting input or textarea
   * editor's root content. This method doesn't support HTML editors.
   */
  nsIContent* GetTextEditorRootContent(nsIEditor** aEditor = nullptr);

  /**
   * Get the nearest selection root, ie. the node that will be selected if the
   * user does "Select All" while the focus is in this node. Note that if this
   * node is not in an editor, the result comes from the nsFrameSelection that
   * is related to aPresShell, so the result might not be the ancestor of this
   * node. Be aware that if this node and the computed selection limiter are
   * not in same subtree, this returns the root content of the closeset subtree.
   */
  nsIContent* GetSelectionRootContent(nsIPresShell* aPresShell);

  virtual nsINodeList* ChildNodes();
  nsIContent* GetFirstChild() const { return mFirstChild; }
  nsIContent* GetLastChild() const
  {
    uint32_t count;
    nsIContent* const* children = GetChildArray(&count);

    return count > 0 ? children[count - 1] : nullptr;
  }

  /**
   * Implementation is in nsIDocument.h, because it needs to cast from
   * nsIDocument* to nsINode*.
   */
  nsIDocument* GetOwnerDocument() const;

  void Normalize();

  /**
   * Get the base URI for any relative URIs within this piece of
   * content. Generally, this is the document's base URI, but certain
   * content carries a local base for backward compatibility, and XML
   * supports setting a per-node base URI.
   *
   * @return the base URI
   */
  virtual already_AddRefed<nsIURI> GetBaseURI(bool aTryUseXHRDocBaseURI = false) const = 0;
  already_AddRefed<nsIURI> GetBaseURIObject() const;

  /**
   * Facility for explicitly setting a base URI on a node.
   */
  nsresult SetExplicitBaseURI(nsIURI* aURI);
  /**
   * The explicit base URI, if set, otherwise null
   */

  /**
   * Return true if the node may be apz aware. There are two cases. One is that
   * the node is apz aware (such as HTMLInputElement with number type). The
   * other is that the node has apz aware listeners. This is a non-virtual
   * function which calls IsNodeApzAwareInternal only when the MayBeApzAware is
   * set. We check the details in IsNodeApzAwareInternal which may be overriden
   * by child classes
   */
  bool IsNodeApzAware() const
  {
    return NodeMayBeApzAware() ? IsNodeApzAwareInternal() : false;
  }

  /**
   * Override this function and set the flag MayBeApzAware in case the node has
   * to let APZC be aware of it. It's used when the node may handle the apz
   * aware events and may do preventDefault to stop APZC to do default actions.
   *
   * For example, instead of scrolling page by APZ, we handle mouse wheel event
   * in HTMLInputElement with number type as increasing / decreasing its value.
   */
  virtual bool IsNodeApzAwareInternal() const;

  // HTML elements named <shadow> may or may not be HTMLShadowElement.  This is
  // a way to ask an element whether it's an HTMLShadowElement.
  virtual bool IsHTMLShadowElement() const { return false; }

  // Elements named <content> may or may not be HTMLContentElement.  This is a
  // way to ask an element whether it's an HTMLContentElement.
  virtual bool IsHTMLContentElement() const { return false; }

protected:
  nsIURI* GetExplicitBaseURI() const {
    if (HasExplicitBaseURI()) {
      return static_cast<nsIURI*>(GetProperty(nsGkAtoms::baseURIProperty));
    }
    return nullptr;
  }

public:
  void GetTextContent(nsAString& aTextContent,
                      mozilla::ErrorResult& aError)
  {
    GetTextContentInternal(aTextContent, aError);
  }
  void SetTextContent(const nsAString& aTextContent,
                      mozilla::ErrorResult& aError)
  {
    SetTextContentInternal(aTextContent, aError);
  }

  mozilla::dom::Element* QuerySelector(const nsAString& aSelector,
                                       mozilla::ErrorResult& aResult);
  already_AddRefed<nsINodeList> QuerySelectorAll(const nsAString& aSelector,
                                                 mozilla::ErrorResult& aResult);

  nsresult QuerySelector(const nsAString& aSelector, nsIDOMElement **aReturn);
  nsresult QuerySelectorAll(const nsAString& aSelector, nsIDOMNodeList **aReturn);

protected:
  // nsIDocument overrides this with its own (faster) version.  This
  // should really only be called for elements and document fragments.
  mozilla::dom::Element* GetElementById(const nsAString& aId);

public:
  /**
   * Associate an object aData to aKey on this node. If aData is null any
   * previously registered object associated to aKey on this node will
   * be removed.
   * Should only be used to implement the DOM Level 3 UserData API.
   *
   * @param aKey the key to associate the object to
   * @param aData the object to associate to aKey on this node (may be null)
   * @param aResult [out] the previously registered object for aKey on this
   *                      node, if any
   * @return whether adding the object succeeded
   */
  nsresult SetUserData(const nsAString& aKey, nsIVariant* aData,
                       nsIVariant** aResult);

  /**
   * Get the UserData object registered for a Key on this node, if any.
   * Should only be used to implement the DOM Level 3 UserData API.
   *
   * @param aKey the key to get UserData for
   * @return aResult the previously registered object for aKey on this node, if
   *                 any
   */
  nsIVariant* GetUserData(const nsAString& aKey);

  nsresult GetUserData(const nsAString& aKey, nsIVariant** aResult)
  {
    NS_IF_ADDREF(*aResult = GetUserData(aKey));

    return NS_OK;
  }

  void LookupPrefix(const nsAString& aNamespace, nsAString& aResult);
  bool IsDefaultNamespace(const nsAString& aNamespaceURI)
  {
    nsAutoString defaultNamespace;
    LookupNamespaceURI(EmptyString(), defaultNamespace);
    return aNamespaceURI.Equals(defaultNamespace);
  }
  void LookupNamespaceURI(const nsAString& aNamespacePrefix,
                          nsAString& aNamespaceURI);

  nsresult IsEqualNode(nsIDOMNode* aOther, bool* aReturn);

  nsIContent* GetNextSibling() const { return mNextSibling; }
  nsIContent* GetPreviousSibling() const { return mPreviousSibling; }

  /**
   * Get the next node in the pre-order tree traversal of the DOM.  If
   * aRoot is non-null, then it must be an ancestor of |this|
   * (possibly equal to |this|) and only nodes that are descendants of
   * aRoot, not including aRoot itself, will be returned.  Returns
   * null if there are no more nodes to traverse.
   */
  nsIContent* GetNextNode(const nsINode* aRoot = nullptr) const
  {
    return GetNextNodeImpl(aRoot, false);
  }

  /**
   * Get the next node in the pre-order tree traversal of the DOM but ignoring
   * the children of this node.  If aRoot is non-null, then it must be an
   * ancestor of |this| (possibly equal to |this|) and only nodes that are
   * descendants of aRoot, not including aRoot itself, will be returned.
   * Returns null if there are no more nodes to traverse.
   */
  nsIContent* GetNextNonChildNode(const nsINode* aRoot = nullptr) const
  {
    return GetNextNodeImpl(aRoot, true);
  }

  /**
   * Returns true if 'this' is either document or element or
   * document fragment and aOther is a descendant in the same
   * anonymous tree.
   */
  bool Contains(const nsINode* aOther) const;
  nsresult Contains(nsIDOMNode* aOther, bool* aReturn);

  bool UnoptimizableCCNode() const;

private:

  nsIDocument* GetComposedDocInternal() const;

  nsIContent* GetNextNodeImpl(const nsINode* aRoot,
                              const bool aSkipChildren) const
  {
    // Can't use nsContentUtils::ContentIsDescendantOf here, since we
    // can't include it here.
#ifdef DEBUG
    if (aRoot) {
      const nsINode* cur = this;
      for (; cur; cur = cur->GetParentNode())
        if (cur == aRoot) break;
      NS_ASSERTION(cur, "aRoot not an ancestor of |this|?");
    }
#endif
    if (!aSkipChildren) {
      nsIContent* kid = GetFirstChild();
      if (kid) {
        return kid;
      }
    }
    if (this == aRoot) {
      return nullptr;
    }
    const nsINode* cur = this;
    while (1) {
      nsIContent* next = cur->GetNextSibling();
      if (next) {
        return next;
      }
      nsINode* parent = cur->GetParentNode();
      if (parent == aRoot) {
        return nullptr;
      }
      cur = parent;
    }
    NS_NOTREACHED("How did we get here?");
  }

public:

  /**
   * Get the previous nsIContent in the pre-order tree traversal of the DOM.  If
   * aRoot is non-null, then it must be an ancestor of |this|
   * (possibly equal to |this|) and only nsIContents that are descendants of
   * aRoot, including aRoot itself, will be returned.  Returns
   * null if there are no more nsIContents to traverse.
   */
  nsIContent* GetPreviousContent(const nsINode* aRoot = nullptr) const
  {
      // Can't use nsContentUtils::ContentIsDescendantOf here, since we
      // can't include it here.
#ifdef DEBUG
      if (aRoot) {
        const nsINode* cur = this;
        for (; cur; cur = cur->GetParentNode())
          if (cur == aRoot) break;
        NS_ASSERTION(cur, "aRoot not an ancestor of |this|?");
      }
#endif

    if (this == aRoot) {
      return nullptr;
    }
    nsIContent* cur = this->GetParent();
    nsIContent* iter = this->GetPreviousSibling();
    while (iter) {
      cur = iter;
      iter = reinterpret_cast<nsINode*>(iter)->GetLastChild();
    }
    return cur;
  }

  /**
   * Boolean flags
   */
private:
  enum BooleanFlag {
    // Set if we're being used from -moz-element
    NodeHasRenderingObservers,
    // Set if our parent chain (including this node itself) terminates
    // in a document
    IsInDocument,
    // Set if mParent is an nsIContent
    ParentIsContent,
    // Set if this node is an Element
    NodeIsElement,
    // Set if the element has a non-empty id attribute. This can in rare
    // cases lie for nsXMLElement, such as when the node has been moved between
    // documents with different id mappings.
    ElementHasID,
    // Set if the element might have inline style.
    ElementMayHaveStyle,
    // Set if the element has a name attribute set.
    ElementHasName,
    // Set if the element might have a contenteditable attribute set.
    ElementMayHaveContentEditableAttr,
    // Set if the node is the common ancestor of the start/end nodes of a Range
    // that is in a Selection.
    NodeIsCommonAncestorForRangeInSelection,
    // Set if the node is a descendant of a node with the above bit set.
    NodeIsDescendantOfCommonAncestorForRangeInSelection,
    // Set if CanSkipInCC check has been done for this subtree root.
    NodeIsCCMarkedRoot,
    // Maybe set if this node is in black subtree.
    NodeIsCCBlackTree,
    // Maybe set if the node is a root of a subtree
    // which needs to be kept in the purple buffer.
    NodeIsPurpleRoot,
    // Set if the node has an explicit base URI stored
    NodeHasExplicitBaseURI,
    // Set if the element has some style states locked
    ElementHasLockedStyleStates,
    // Set if element has pointer locked
    ElementHasPointerLock,
    // Set if the node may have DOMMutationObserver attached to it.
    NodeMayHaveDOMMutationObserver,
    // Set if node is Content
    NodeIsContent,
    // Set if the node has animations or transitions
    ElementHasAnimations,
    // Set if node has a dir attribute with a valid value (ltr, rtl, or auto)
    NodeHasValidDirAttribute,
    // Set if node has a dir attribute with a fixed value (ltr or rtl, NOT auto)
    NodeHasFixedDir,
    // Set if the node has dir=auto and has a property pointing to the text
    // node that determines its direction
    NodeHasDirAutoSet,
    // Set if the node is a text node descendant of a node with dir=auto
    // and has a TextNodeDirectionalityMap property listing the elements whose
    // direction it determines.
    NodeHasTextNodeDirectionalityMap,
    // Set if the node has dir=auto.
    NodeHasDirAuto,
    // Set if a node in the node's parent chain has dir=auto.
    NodeAncestorHasDirAuto,
    // Set if the element is in the scope of a scoped style sheet; this flag is
    // only accurate for elements bound to a document
    ElementIsInStyleScope,
    // Set if the element is a scoped style sheet root
    ElementIsScopedStyleRoot,
    // Set if the node is handling a click.
    NodeHandlingClick,
    // Set if the node has had :hover selectors matched against it
    NodeHasRelevantHoverRules,
    // Set if the element has a parser insertion mode other than "in body",
    // per the HTML5 "Parse state" section.
    ElementHasWeirdParserInsertionMode,
    // Parser sets this flag if it has notified about the node.
    ParserHasNotified,
    // Sets if the node is apz aware or we have apz aware listeners.
    MayBeApzAware,
    // Guard value
    BooleanFlagCount
  };

  void SetBoolFlag(BooleanFlag name, bool value) {
    static_assert(BooleanFlagCount <= 8*sizeof(mBoolFlags),
                  "Too many boolean flags");
    mBoolFlags = (mBoolFlags & ~(1 << name)) | (value << name);
  }

  void SetBoolFlag(BooleanFlag name) {
    static_assert(BooleanFlagCount <= 8*sizeof(mBoolFlags),
                  "Too many boolean flags");
    mBoolFlags |= (1 << name);
  }

  void ClearBoolFlag(BooleanFlag name) {
    static_assert(BooleanFlagCount <= 8*sizeof(mBoolFlags),
                  "Too many boolean flags");
    mBoolFlags &= ~(1 << name);
  }

  bool GetBoolFlag(BooleanFlag name) const {
    static_assert(BooleanFlagCount <= 8*sizeof(mBoolFlags),
                  "Too many boolean flags");
    return mBoolFlags & (1 << name);
  }

public:
  bool HasRenderingObservers() const
    { return GetBoolFlag(NodeHasRenderingObservers); }
  void SetHasRenderingObservers(bool aValue)
    { SetBoolFlag(NodeHasRenderingObservers, aValue); }
  bool IsContent() const { return GetBoolFlag(NodeIsContent); }
  bool HasID() const { return GetBoolFlag(ElementHasID); }
  bool MayHaveStyle() const { return GetBoolFlag(ElementMayHaveStyle); }
  bool HasName() const { return GetBoolFlag(ElementHasName); }
  bool MayHaveContentEditableAttr() const
    { return GetBoolFlag(ElementMayHaveContentEditableAttr); }
  bool IsCommonAncestorForRangeInSelection() const
    { return GetBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
  void SetCommonAncestorForRangeInSelection()
    { SetBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
  void ClearCommonAncestorForRangeInSelection()
    { ClearBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
  bool IsDescendantOfCommonAncestorForRangeInSelection() const
    { return GetBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }
  void SetDescendantOfCommonAncestorForRangeInSelection()
    { SetBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }
  void ClearDescendantOfCommonAncestorForRangeInSelection()
    { ClearBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }

  void SetCCMarkedRoot(bool aValue)
    { SetBoolFlag(NodeIsCCMarkedRoot, aValue); }
  bool CCMarkedRoot() const { return GetBoolFlag(NodeIsCCMarkedRoot); }
  void SetInCCBlackTree(bool aValue)
    { SetBoolFlag(NodeIsCCBlackTree, aValue); }
  bool InCCBlackTree() const { return GetBoolFlag(NodeIsCCBlackTree); }
  void SetIsPurpleRoot(bool aValue)
    { SetBoolFlag(NodeIsPurpleRoot, aValue); }
  bool IsPurpleRoot() const { return GetBoolFlag(NodeIsPurpleRoot); }
  bool MayHaveDOMMutationObserver()
    { return GetBoolFlag(NodeMayHaveDOMMutationObserver); }
  void SetMayHaveDOMMutationObserver()
    { SetBoolFlag(NodeMayHaveDOMMutationObserver, true); }
  bool HasListenerManager() { return HasFlag(NODE_HAS_LISTENERMANAGER); }
  bool HasPointerLock() const { return GetBoolFlag(ElementHasPointerLock); }
  void SetPointerLock() { SetBoolFlag(ElementHasPointerLock); }
  void ClearPointerLock() { ClearBoolFlag(ElementHasPointerLock); }
  bool MayHaveAnimations() { return GetBoolFlag(ElementHasAnimations); }
  void SetMayHaveAnimations() { SetBoolFlag(ElementHasAnimations); }
  void SetHasValidDir() { SetBoolFlag(NodeHasValidDirAttribute); }
  void ClearHasValidDir() { ClearBoolFlag(NodeHasValidDirAttribute); }
  bool HasValidDir() const { return GetBoolFlag(NodeHasValidDirAttribute); }
  void SetHasFixedDir() {
    MOZ_ASSERT(NodeType() != nsIDOMNode::TEXT_NODE,
               "SetHasFixedDir on text node");
    SetBoolFlag(NodeHasFixedDir);
  }
  void ClearHasFixedDir() {
    MOZ_ASSERT(NodeType() != nsIDOMNode::TEXT_NODE,
               "ClearHasFixedDir on text node");
    ClearBoolFlag(NodeHasFixedDir);
  }
  bool HasFixedDir() const { return GetBoolFlag(NodeHasFixedDir); }
  void SetHasDirAutoSet() {
    MOZ_ASSERT(NodeType() != nsIDOMNode::TEXT_NODE,
               "SetHasDirAutoSet on text node");
    SetBoolFlag(NodeHasDirAutoSet);
  }
  void ClearHasDirAutoSet() {
    MOZ_ASSERT(NodeType() != nsIDOMNode::TEXT_NODE,
               "ClearHasDirAutoSet on text node");
    ClearBoolFlag(NodeHasDirAutoSet);
  }
  bool HasDirAutoSet() const
    { return GetBoolFlag(NodeHasDirAutoSet); }
  void SetHasTextNodeDirectionalityMap() {
    MOZ_ASSERT(NodeType() == nsIDOMNode::TEXT_NODE,
               "SetHasTextNodeDirectionalityMap on non-text node");
    SetBoolFlag(NodeHasTextNodeDirectionalityMap);
  }
  void ClearHasTextNodeDirectionalityMap() {
    MOZ_ASSERT(NodeType() == nsIDOMNode::TEXT_NODE,
               "ClearHasTextNodeDirectionalityMap on non-text node");
    ClearBoolFlag(NodeHasTextNodeDirectionalityMap);
  }
  bool HasTextNodeDirectionalityMap() const {
    MOZ_ASSERT(NodeType() == nsIDOMNode::TEXT_NODE,
               "HasTextNodeDirectionalityMap on non-text node");
    return GetBoolFlag(NodeHasTextNodeDirectionalityMap);
  }

  void SetHasDirAuto() { SetBoolFlag(NodeHasDirAuto); }
  void ClearHasDirAuto() { ClearBoolFlag(NodeHasDirAuto); }
  bool HasDirAuto() const { return GetBoolFlag(NodeHasDirAuto); }

  void SetAncestorHasDirAuto() { SetBoolFlag(NodeAncestorHasDirAuto); }
  void ClearAncestorHasDirAuto() { ClearBoolFlag(NodeAncestorHasDirAuto); }
  bool AncestorHasDirAuto() const { return GetBoolFlag(NodeAncestorHasDirAuto); }

  bool NodeOrAncestorHasDirAuto() const
    { return HasDirAuto() || AncestorHasDirAuto(); }

  void SetIsElementInStyleScope(bool aValue) {
    MOZ_ASSERT(IsElement(), "SetIsInStyleScope on a non-Element node");
    SetBoolFlag(ElementIsInStyleScope, aValue);
  }
  void SetIsElementInStyleScope() {
    MOZ_ASSERT(IsElement(), "SetIsInStyleScope on a non-Element node");
    SetBoolFlag(ElementIsInStyleScope);
  }
  void ClearIsElementInStyleScope() {
    MOZ_ASSERT(IsElement(), "ClearIsInStyleScope on a non-Element node");
    ClearBoolFlag(ElementIsInStyleScope);
  }
  bool IsElementInStyleScope() const { return GetBoolFlag(ElementIsInStyleScope); }

  void SetIsScopedStyleRoot() { SetBoolFlag(ElementIsScopedStyleRoot); }
  void ClearIsScopedStyleRoot() { ClearBoolFlag(ElementIsScopedStyleRoot); }
  bool IsScopedStyleRoot() { return GetBoolFlag(ElementIsScopedStyleRoot); }
  bool HasRelevantHoverRules() const { return GetBoolFlag(NodeHasRelevantHoverRules); }
  void SetHasRelevantHoverRules() { SetBoolFlag(NodeHasRelevantHoverRules); }
  void SetParserHasNotified() { SetBoolFlag(ParserHasNotified); };
  bool HasParserNotified() { return GetBoolFlag(ParserHasNotified); }

  void SetMayBeApzAware() { SetBoolFlag(MayBeApzAware); }
  bool NodeMayBeApzAware() const
  {
    return GetBoolFlag(MayBeApzAware);
  }
protected:
  void SetParentIsContent(bool aValue) { SetBoolFlag(ParentIsContent, aValue); }
  void SetIsInDocument() { SetBoolFlag(IsInDocument); }
  void SetNodeIsContent() { SetBoolFlag(NodeIsContent); }
  void ClearInDocument() { ClearBoolFlag(IsInDocument); }
  void SetIsElement() { SetBoolFlag(NodeIsElement); }
  void SetHasID() { SetBoolFlag(ElementHasID); }
  void ClearHasID() { ClearBoolFlag(ElementHasID); }
  void SetMayHaveStyle() { SetBoolFlag(ElementMayHaveStyle); }
  void SetHasName() { SetBoolFlag(ElementHasName); }
  void ClearHasName() { ClearBoolFlag(ElementHasName); }
  void SetMayHaveContentEditableAttr()
    { SetBoolFlag(ElementMayHaveContentEditableAttr); }
  bool HasExplicitBaseURI() const { return GetBoolFlag(NodeHasExplicitBaseURI); }
  void SetHasExplicitBaseURI() { SetBoolFlag(NodeHasExplicitBaseURI); }
  void SetHasLockedStyleStates() { SetBoolFlag(ElementHasLockedStyleStates); }
  void ClearHasLockedStyleStates() { ClearBoolFlag(ElementHasLockedStyleStates); }
  bool HasLockedStyleStates() const
    { return GetBoolFlag(ElementHasLockedStyleStates); }
  void SetHasWeirdParserInsertionMode() { SetBoolFlag(ElementHasWeirdParserInsertionMode); }
  bool HasWeirdParserInsertionMode() const
  { return GetBoolFlag(ElementHasWeirdParserInsertionMode); }
  bool HandlingClick() const { return GetBoolFlag(NodeHandlingClick); }
  void SetHandlingClick() { SetBoolFlag(NodeHandlingClick); }
  void ClearHandlingClick() { ClearBoolFlag(NodeHandlingClick); }

  void SetSubtreeRootPointer(nsINode* aSubtreeRoot)
  {
    NS_ASSERTION(aSubtreeRoot, "aSubtreeRoot can never be null!");
    NS_ASSERTION(!(IsNodeOfType(eCONTENT) && IsInUncomposedDoc()) &&
                 !IsInShadowTree(), "Shouldn't be here!");
    mSubtreeRoot = aSubtreeRoot;
  }

  void ClearSubtreeRootPointer()
  {
    mSubtreeRoot = nullptr;
  }

public:
  // Makes nsINode object to keep aObject alive.
  void BindObject(nsISupports* aObject);
  // After calling UnbindObject nsINode object doesn't keep
  // aObject alive anymore.
  void UnbindObject(nsISupports* aObject);

  void GetBoundMutationObservers(nsTArray<RefPtr<nsDOMMutationObserver> >& aResult);

  already_AddRefed<mozilla::dom::AccessibleNode> GetAccessibleNode();

  /**
   * Returns the length of this node, as specified at
   * <http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-node-length>
   */
  uint32_t Length() const;

  void GetNodeName(mozilla::dom::DOMString& aNodeName)
  {
    const nsString& nodeName = NodeName();
    aNodeName.SetStringBuffer(nsStringBuffer::FromString(nodeName),
                              nodeName.Length());
  }
  MOZ_MUST_USE nsresult GetBaseURI(nsAString& aBaseURI) const;
  // Return the base URI for the document.
  // The returned value may differ if the document is loaded via XHR, and
  // when accessed from chrome privileged script and
  // from content privileged script for compatibility.
  void GetBaseURIFromJS(nsAString& aBaseURI, mozilla::ErrorResult& aRv) const;
  bool HasChildNodes() const
  {
    return HasChildren();
  }
  uint16_t CompareDocumentPosition(nsINode& aOther) const;
  void GetNodeValue(nsAString& aNodeValue)
  {
    GetNodeValueInternal(aNodeValue);
  }
  void SetNodeValue(const nsAString& aNodeValue,
                    mozilla::ErrorResult& aError)
  {
    SetNodeValueInternal(aNodeValue, aError);
  }
  virtual void GetNodeValueInternal(nsAString& aNodeValue);
  virtual void SetNodeValueInternal(const nsAString& aNodeValue,
                                    mozilla::ErrorResult& aError)
  {
    // The DOM spec says that when nodeValue is defined to be null "setting it
    // has no effect", so we don't throw an exception.
  }
  void EnsurePreInsertionValidity(nsINode& aNewChild, nsINode* aRefChild,
                                  mozilla::ErrorResult& aError);
  nsINode* InsertBefore(nsINode& aNode, nsINode* aChild,
                        mozilla::ErrorResult& aError)
  {
    return ReplaceOrInsertBefore(false, &aNode, aChild, aError);
  }
  nsINode* AppendChild(nsINode& aNode, mozilla::ErrorResult& aError)
  {
    return InsertBefore(aNode, nullptr, aError);
  }
  nsINode* ReplaceChild(nsINode& aNode, nsINode& aChild,
                        mozilla::ErrorResult& aError)
  {
    return ReplaceOrInsertBefore(true, &aNode, &aChild, aError);
  }
  nsINode* RemoveChild(nsINode& aChild, mozilla::ErrorResult& aError);
  already_AddRefed<nsINode> CloneNode(bool aDeep, mozilla::ErrorResult& aError);
  bool IsSameNode(nsINode* aNode);
  bool IsEqualNode(nsINode* aNode);
  void GetNamespaceURI(nsAString& aNamespaceURI) const
  {
    mNodeInfo->GetNamespaceURI(aNamespaceURI);
  }
#ifdef MOZILLA_INTERNAL_API
  void GetPrefix(nsAString& aPrefix)
  {
    mNodeInfo->GetPrefix(aPrefix);
  }
#endif
  void GetLocalName(mozilla::dom::DOMString& aLocalName) const
  {
    const nsString& localName = LocalName();
    if (localName.IsVoid()) {
      aLocalName.SetNull();
    } else {
      aLocalName.SetStringBuffer(nsStringBuffer::FromString(localName),
                                 localName.Length());
    }
  }

  nsDOMAttributeMap* GetAttributes();
  void SetUserData(JSContext* aCx, const nsAString& aKey,
                   JS::Handle<JS::Value> aData,
                   JS::MutableHandle<JS::Value> aRetval,
                   mozilla::ErrorResult& aError);
  void GetUserData(JSContext* aCx, const nsAString& aKey,
                   JS::MutableHandle<JS::Value> aRetval,
                   mozilla::ErrorResult& aError);

  // Helper method to remove this node from its parent. This is not exposed
  // through WebIDL.
  // Only call this if the node has a parent node.
  nsresult RemoveFromParent()
  {
    nsINode* parent = GetParentNode();
    mozilla::ErrorResult rv;
    parent->RemoveChild(*this, rv);
    return rv.StealNSResult();
  }

  // ChildNode methods
  mozilla::dom::Element* GetPreviousElementSibling() const;
  mozilla::dom::Element* GetNextElementSibling() const;

  void Before(const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv);
  void After(const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv);
  void ReplaceWith(const Sequence<OwningNodeOrString>& aNodes,
                   ErrorResult& aRv);
  /**
   * Remove this node from its parent, if any.
   */
  void Remove();

  // ParentNode methods
  mozilla::dom::Element* GetFirstElementChild() const;
  mozilla::dom::Element* GetLastElementChild() const;

  void Prepend(const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv);
  void Append(const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv);

  void GetBoxQuads(const BoxQuadOptions& aOptions,
                   nsTArray<RefPtr<DOMQuad> >& aResult,
                   mozilla::ErrorResult& aRv);

  already_AddRefed<DOMQuad> ConvertQuadFromNode(DOMQuad& aQuad,
                                                const TextOrElementOrDocument& aFrom,
                                                const ConvertCoordinateOptions& aOptions,
                                                ErrorResult& aRv);
  already_AddRefed<DOMQuad> ConvertRectFromNode(DOMRectReadOnly& aRect,
                                                const TextOrElementOrDocument& aFrom,
                                                const ConvertCoordinateOptions& aOptions,
                                                ErrorResult& aRv);
  already_AddRefed<DOMPoint> ConvertPointFromNode(const DOMPointInit& aPoint,
                                                  const TextOrElementOrDocument& aFrom,
                                                  const ConvertCoordinateOptions& aOptions,
                                                  ErrorResult& aRv);

protected:

  // Override this function to create a custom slots class.
  // Must not return null.
  virtual nsINode::nsSlots* CreateSlots();

  bool HasSlots() const
  {
    return mSlots != nullptr;
  }

  nsSlots* GetExistingSlots() const
  {
    return mSlots;
  }

  nsSlots* Slots()
  {
    if (!HasSlots()) {
      mSlots = CreateSlots();
      MOZ_ASSERT(mSlots);
    }
    return GetExistingSlots();
  }

  nsTObserverArray<nsIMutationObserver*> *GetMutationObservers()
  {
    return HasSlots() ? &GetExistingSlots()->mMutationObservers : nullptr;
  }

  bool IsEditableInternal() const;
  virtual bool IsEditableExternal() const
  {
    return IsEditableInternal();
  }

  virtual void GetTextContentInternal(nsAString& aTextContent,
                                      mozilla::ErrorResult& aError);
  virtual void SetTextContentInternal(const nsAString& aTextContent,
                                      mozilla::ErrorResult& aError)
  {
  }

#ifdef DEBUG
  // Note: virtual so that IsInNativeAnonymousSubtree can be called accross
  // module boundaries.
  virtual void CheckNotNativeAnonymous() const;
#endif

  // These are just used to implement nsIDOMNode using
  // NS_FORWARD_NSIDOMNODE_TO_NSINODE_HELPER and for quickstubs.
  nsresult GetParentNode(nsIDOMNode** aParentNode);
  nsresult GetParentElement(nsIDOMElement** aParentElement);
  nsresult GetChildNodes(nsIDOMNodeList** aChildNodes);
  nsresult GetFirstChild(nsIDOMNode** aFirstChild);
  nsresult GetLastChild(nsIDOMNode** aLastChild);
  nsresult GetPreviousSibling(nsIDOMNode** aPrevSibling);
  nsresult GetNextSibling(nsIDOMNode** aNextSibling);
  nsresult GetOwnerDocument(nsIDOMDocument** aOwnerDocument);
  nsresult CompareDocumentPosition(nsIDOMNode* aOther,
                                   uint16_t* aReturn);

  void EnsurePreInsertionValidity1(nsINode& aNewChild, nsINode* aRefChild,
                                   mozilla::ErrorResult& aError);
  void EnsurePreInsertionValidity2(bool aReplace, nsINode& aNewChild,
                                   nsINode* aRefChild,
                                   mozilla::ErrorResult& aError);
  nsresult ReplaceOrInsertBefore(bool aReplace, nsIDOMNode *aNewChild,
                                 nsIDOMNode *aRefChild, nsIDOMNode **aReturn);
  nsINode* ReplaceOrInsertBefore(bool aReplace, nsINode* aNewChild,
                                 nsINode* aRefChild,
                                 mozilla::ErrorResult& aError);
  nsresult RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aReturn);

  /**
   * Returns the Element that should be used for resolving namespaces
   * on this node (ie the ownerElement for attributes, the documentElement for
   * documents, the node itself for elements and for other nodes the parentNode
   * if it is an element).
   */
  virtual mozilla::dom::Element* GetNameSpaceElement() = 0;

  /**
   * Most of the implementation of the nsINode RemoveChildAt method.
   * Should only be called on document, element, and document fragment
   * nodes.  The aChildArray passed in should be the one for |this|.
   *
   * @param aIndex The index to remove at.
   * @param aNotify Whether to notify.
   * @param aKid The kid at aIndex.  Must not be null.
   * @param aChildArray The child array to work with.
   * @param aMutationEvent whether to fire a mutation event for this removal.
   */
  void doRemoveChildAt(uint32_t aIndex, bool aNotify, nsIContent* aKid,
                       nsAttrAndChildArray& aChildArray);

  /**
   * Most of the implementation of the nsINode InsertChildAt method.
   * Should only be called on document, element, and document fragment
   * nodes.  The aChildArray passed in should be the one for |this|.
   *
   * @param aKid The child to insert.
   * @param aIndex The index to insert at.
   * @param aNotify Whether to notify.
   * @param aChildArray The child array to work with
   */
  nsresult doInsertChildAt(nsIContent* aKid, uint32_t aIndex,
                           bool aNotify, nsAttrAndChildArray& aChildArray);

  /**
   * Parse the given selector string into an nsCSSSelectorList.
   *
   * A null return value with a non-failing aRv means the string only
   * contained pseudo-element selectors.
   *
   * A failing aRv means the string was not a valid selector.
   */
  nsCSSSelectorList* ParseSelectorList(const nsAString& aSelectorString,
                                       mozilla::ErrorResult& aRv);

public:
  /* Event stuff that documents and elements share.  This needs to be
     NS_IMETHOD because some subclasses implement DOM methods with
     this exact name and signature and then the calling convention
     needs to match.

     Note that we include DOCUMENT_ONLY_EVENT events here so that we
     can forward all the document stuff to this implementation.
  */
#define EVENT(name_, id_, type_, struct_)                             \
  mozilla::dom::EventHandlerNonNull* GetOn##name_();                  \
  void SetOn##name_(mozilla::dom::EventHandlerNonNull* listener);
#define TOUCH_EVENT EVENT
#define DOCUMENT_ONLY_EVENT EVENT
#include "mozilla/EventNameList.h"
#undef DOCUMENT_ONLY_EVENT
#undef TOUCH_EVENT
#undef EVENT

  bool HasServoData() {
#ifdef MOZ_STYLO
    return !!mServoData.Get();
#else
    MOZ_CRASH("Accessing servo node data in non-stylo build");
#endif
  }

  void ClearServoData();

protected:
  static bool Traverse(nsINode *tmp, nsCycleCollectionTraversalCallback &cb);
  static void Unlink(nsINode *tmp);

  RefPtr<mozilla::dom::NodeInfo> mNodeInfo;

  // mParent is an owning ref most of the time, except for the case of document
  // nodes, so it cannot be represented by nsCOMPtr, so mark is as
  // MOZ_OWNING_REF.
  nsINode* MOZ_OWNING_REF mParent;

private:
  // Boolean flags.
  uint32_t mBoolFlags;

protected:
  // These references are non-owning and safe, as they are managed by
  // nsAttrAndChildArray.
  nsIContent* MOZ_NON_OWNING_REF mNextSibling;
  nsIContent* MOZ_NON_OWNING_REF mPreviousSibling;
  // This reference is non-owning and safe, since in the case of documents,
  // it is set to null when the document gets destroyed, and in the case of
  // other nodes, the children keep the parents alive.
  nsIContent* MOZ_NON_OWNING_REF mFirstChild;

  union {
    // Pointer to our primary frame.  Might be null.
    nsIFrame* mPrimaryFrame;

    // Pointer to the root of our subtree.  Might be null.
    // This reference is non-owning and safe, since it either points to the
    // object itself, or is reset by ClearSubtreeRootPointer.
    nsINode* MOZ_NON_OWNING_REF mSubtreeRoot;
  };

  // Storage for more members that are usually not needed; allocated lazily.
  nsSlots* mSlots;

#ifdef MOZ_STYLO
  // Per-node data managed by Servo.
  mozilla::ServoCell<ServoNodeData*> mServoData;
#endif
};

inline nsIDOMNode* GetAsDOMNode(nsINode* aNode)
{
  return aNode ? aNode->AsDOMNode() : nullptr;
}

// Useful inline function for getting a node given an nsIContent and an
// nsIDocument.  Returns the first argument cast to nsINode if it is non-null,
// otherwise returns the second (which may be null).  We use type variables
// instead of nsIContent* and nsIDocument* because the actual types must be
// known for the cast to work.
template<class C, class D>
inline nsINode* NODE_FROM(C& aContent, D& aDocument)
{
  if (aContent)
    return static_cast<nsINode*>(aContent);
  return static_cast<nsINode*>(aDocument);
}

NS_DEFINE_STATIC_IID_ACCESSOR(nsINode, NS_INODE_IID)

inline nsISupports*
ToSupports(nsINode* aPointer)
{
  return aPointer;
}

inline nsISupports*
ToCanonicalSupports(nsINode* aPointer)
{
  return aPointer;
}

#define NS_FORWARD_NSIDOMNODE_TO_NSINODE_HELPER(...) \
  NS_IMETHOD GetNodeName(nsAString& aNodeName) __VA_ARGS__ override \
  { \
    aNodeName = nsINode::NodeName(); \
    return NS_OK; \
  } \
  NS_IMETHOD GetNodeValue(nsAString& aNodeValue) __VA_ARGS__ override \
  { \
    nsINode::GetNodeValue(aNodeValue); \
    return NS_OK; \
  } \
  NS_IMETHOD SetNodeValue(const nsAString& aNodeValue) __VA_ARGS__ override \
  { \
    mozilla::ErrorResult rv; \
    nsINode::SetNodeValue(aNodeValue, rv); \
    return rv.StealNSResult(); \
  } \
  NS_IMETHOD GetNodeType(uint16_t* aNodeType) __VA_ARGS__ override \
  { \
    *aNodeType = nsINode::NodeType(); \
    return NS_OK; \
  } \
  NS_IMETHOD GetParentNode(nsIDOMNode** aParentNode) __VA_ARGS__ override \
  { \
    return nsINode::GetParentNode(aParentNode); \
  } \
  NS_IMETHOD GetParentElement(nsIDOMElement** aParentElement) __VA_ARGS__ override \
  { \
    return nsINode::GetParentElement(aParentElement); \
  } \
  NS_IMETHOD GetChildNodes(nsIDOMNodeList** aChildNodes) __VA_ARGS__ override \
  { \
    return nsINode::GetChildNodes(aChildNodes); \
  } \
  NS_IMETHOD GetFirstChild(nsIDOMNode** aFirstChild) __VA_ARGS__ override \
  { \
    return nsINode::GetFirstChild(aFirstChild); \
  } \
  NS_IMETHOD GetLastChild(nsIDOMNode** aLastChild) __VA_ARGS__ override \
  { \
    return nsINode::GetLastChild(aLastChild); \
  } \
  NS_IMETHOD GetPreviousSibling(nsIDOMNode** aPreviousSibling) __VA_ARGS__ override \
  { \
    return nsINode::GetPreviousSibling(aPreviousSibling); \
  } \
  NS_IMETHOD GetNextSibling(nsIDOMNode** aNextSibling) __VA_ARGS__ override \
  { \
    return nsINode::GetNextSibling(aNextSibling); \
  } \
  NS_IMETHOD GetOwnerDocument(nsIDOMDocument** aOwnerDocument) __VA_ARGS__ override \
  { \
    return nsINode::GetOwnerDocument(aOwnerDocument); \
  } \
  NS_IMETHOD InsertBefore(nsIDOMNode* aNewChild, nsIDOMNode* aRefChild, nsIDOMNode** aResult) __VA_ARGS__ override \
  { \
    return ReplaceOrInsertBefore(false, aNewChild, aRefChild, aResult); \
  } \
  NS_IMETHOD ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild, nsIDOMNode** aResult) __VA_ARGS__ override \
  { \
    return ReplaceOrInsertBefore(true, aNewChild, aOldChild, aResult); \
  } \
  NS_IMETHOD RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aResult) __VA_ARGS__ override \
  { \
    return nsINode::RemoveChild(aOldChild, aResult); \
  } \
  NS_IMETHOD AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aResult) __VA_ARGS__ override \
  { \
    return InsertBefore(aNewChild, nullptr, aResult); \
  } \
  NS_IMETHOD HasChildNodes(bool* aResult) __VA_ARGS__ override \
  { \
    *aResult = nsINode::HasChildNodes(); \
    return NS_OK; \
  } \
  NS_IMETHOD CloneNode(bool aDeep, uint8_t aArgc, nsIDOMNode** aResult) __VA_ARGS__ override \
  { \
    if (aArgc == 0) { \
      aDeep = true; \
    } \
    mozilla::ErrorResult rv; \
    nsCOMPtr<nsINode> clone = nsINode::CloneNode(aDeep, rv); \
    if (rv.Failed()) { \
      return rv.StealNSResult(); \
    } \
    *aResult = clone.forget().take()->AsDOMNode(); \
    return NS_OK; \
  } \
  NS_IMETHOD Normalize() __VA_ARGS__ override \
  { \
    nsINode::Normalize(); \
    return NS_OK; \
  } \
  NS_IMETHOD GetNamespaceURI(nsAString& aNamespaceURI) __VA_ARGS__ override \
  { \
    nsINode::GetNamespaceURI(aNamespaceURI); \
    return NS_OK; \
  } \
  NS_IMETHOD GetPrefix(nsAString& aPrefix) __VA_ARGS__ override \
  { \
    nsINode::GetPrefix(aPrefix); \
    return NS_OK; \
  } \
  NS_IMETHOD GetLocalName(nsAString& aLocalName) __VA_ARGS__ override \
  { \
    aLocalName = nsINode::LocalName(); \
    return NS_OK; \
  } \
  NS_IMETHOD UnusedPlaceholder(bool* aResult) __VA_ARGS__ override \
  { \
    *aResult = false; \
    return NS_OK; \
  } \
  NS_IMETHOD GetDOMBaseURI(nsAString& aBaseURI) __VA_ARGS__ override \
  { \
    return nsINode::GetBaseURI(aBaseURI); \
  } \
  NS_IMETHOD CompareDocumentPosition(nsIDOMNode* aOther, uint16_t* aResult) __VA_ARGS__ override \
  { \
    return nsINode::CompareDocumentPosition(aOther, aResult); \
  } \
  NS_IMETHOD GetTextContent(nsAString& aTextContent) __VA_ARGS__ override \
  { \
    mozilla::ErrorResult rv; \
    nsINode::GetTextContent(aTextContent, rv); \
    return rv.StealNSResult(); \
  } \
  NS_IMETHOD SetTextContent(const nsAString& aTextContent) __VA_ARGS__ override \
  { \
    mozilla::ErrorResult rv; \
    nsINode::SetTextContent(aTextContent, rv); \
    return rv.StealNSResult(); \
  } \
  NS_IMETHOD LookupPrefix(const nsAString& aNamespaceURI, nsAString& aResult) __VA_ARGS__ override \
  { \
    nsINode::LookupPrefix(aNamespaceURI, aResult); \
    return NS_OK; \
  } \
  NS_IMETHOD IsDefaultNamespace(const nsAString& aNamespaceURI, bool* aResult) __VA_ARGS__ override \
  { \
    *aResult = nsINode::IsDefaultNamespace(aNamespaceURI); \
    return NS_OK; \
  } \
  NS_IMETHOD LookupNamespaceURI(const nsAString& aPrefix, nsAString& aResult) __VA_ARGS__ override \
  { \
    nsINode::LookupNamespaceURI(aPrefix, aResult); \
    return NS_OK; \
  } \
  NS_IMETHOD IsEqualNode(nsIDOMNode* aArg, bool* aResult) __VA_ARGS__ override \
  { \
    return nsINode::IsEqualNode(aArg, aResult); \
  } \
  NS_IMETHOD SetUserData(const nsAString& aKey, nsIVariant* aData, nsIVariant** aResult) __VA_ARGS__ override \
  { \
    return nsINode::SetUserData(aKey, aData, aResult); \
  } \
  NS_IMETHOD GetUserData(const nsAString& aKey, nsIVariant** aResult) __VA_ARGS__ override \
  { \
    return nsINode::GetUserData(aKey, aResult); \
  } \
  NS_IMETHOD Contains(nsIDOMNode* aOther, bool* aResult) __VA_ARGS__ override \
  { \
    return nsINode::Contains(aOther, aResult); \
  }

#define NS_FORWARD_NSIDOMNODE_TO_NSINODE \
  NS_FORWARD_NSIDOMNODE_TO_NSINODE_HELPER(final)

#define NS_FORWARD_NSIDOMNODE_TO_NSINODE_OVERRIDABLE \
  NS_FORWARD_NSIDOMNODE_TO_NSINODE_HELPER()

#endif /* nsINode_h___ */