summaryrefslogtreecommitdiffstats
path: root/dom/base/nsContentUtils.h
blob: 4ccc1aa2534d7e755c83c47b176d62b1564bc344 (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
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
/* -*- 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/. */

/* A namespace class for static content utilities. */

#ifndef nsContentUtils_h___
#define nsContentUtils_h___

#ifdef XP_WIN
#include <float.h>
#endif

#ifdef XP_SOLARIS
#include <ieeefp.h>
#endif	

#include "js/TypeDecls.h"
#include "js/Value.h"
#include "js/RootingAPI.h"
#include "mozilla/EventForwards.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/TimeStamp.h"
#include "nsContentListDeclarations.h"
#include "nsMathUtils.h"
#include "nsTArrayForwardDeclare.h"
#include "Units.h"
#include "mozilla/dom/AutocompleteInfoBinding.h"
#include "mozilla/dom/BindingDeclarations.h" // For CallerType
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "mozilla/Logging.h"
#include "mozilla/NotNull.h"
#include "nsIContentPolicy.h"
#include "nsIDocument.h"
#include "nsPIDOMWindow.h"

#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#undef LoadImage
#endif

class imgICache;
class imgIContainer;
class imgINotificationObserver;
class imgIRequest;
class imgLoader;
class imgRequestProxy;
class nsAutoScriptBlockerSuppressNodeRemoved;
class nsHtml5StringParser;
class nsIChannel;
class nsIConsoleService;
class nsIContent;
class nsIContentPolicy;
class nsIContentSecurityPolicy;
class nsIDocShellTreeItem;
class nsIDocumentLoaderFactory;
class nsIDOMDocument;
class nsIDOMDocumentFragment;
class nsIDOMEvent;
class nsIDOMHTMLInputElement;
class nsIDOMKeyEvent;
class nsIDOMNode;
class nsIDragSession;
class nsIEditor;
class nsIFragmentContentSink;
class nsIFrame;
class nsIImageLoadingContent;
class nsIInterfaceRequestor;
class nsIIOService;
class nsILineBreaker;
class nsILoadGroup;
class nsIMessageBroadcaster;
class nsNameSpaceManager;
class nsIObserver;
class nsIParser;
class nsIParserService;
class nsIPresShell;
class nsIPrincipal;
class nsIRequest;
class nsIRunnable;
class nsIScriptContext;
class nsIScriptSecurityManager;
class nsIStringBundle;
class nsIStringBundleService;
class nsISupportsHashKey;
class nsIURI;
class nsIUUIDGenerator;
class nsIWidget;
class nsIWordBreaker;
class nsIXPConnect;
class nsNodeInfoManager;
class nsPIDOMWindowInner;
class nsPIDOMWindowOuter;
class nsPresContext;
class nsStringBuffer;
class nsStringHashKey;
class nsTextFragment;
class nsView;
class nsViewportInfo;
class nsWrapperCache;
class nsAttrValue;
class nsITransferable;
class nsPIWindowRoot;
class nsIWindowProvider;

struct JSRuntime;

template<class E> class nsCOMArray;
template<class K, class V> class nsDataHashtable;
template<class K, class V> class nsRefPtrHashtable;
template<class T> class nsReadingIterator;

namespace mozilla {
class ErrorResult;
class EventListenerManager;

namespace dom {
struct CustomElementDefinition;
class DocumentFragment;
class Element;
class EventTarget;
class IPCDataTransfer;
class IPCDataTransferItem;
struct LifecycleCallbackArgs;
struct LifecycleAdoptedCallbackArgs;
class NodeInfo;
class nsIContentChild;
class nsIContentParent;
class TabChild;
class Selection;
class TabParent;
} // namespace dom

namespace ipc {
class Shmem;
class IShmemAllocator;
}

namespace gfx {
class DataSourceSurface;
} // namespace gfx

namespace layers {
class LayerManager;
} // namespace layers

} // namespace mozilla

class nsIBidiKeyboard;

extern const char kLoadAsData[];

// Stolen from nsReadableUtils, but that's OK, since we can declare the same
// name multiple times.
const nsAFlatString& EmptyString();
const nsAFlatCString& EmptyCString();

enum EventNameType {
  EventNameType_None = 0x0000,
  EventNameType_HTML = 0x0001,
  EventNameType_XUL = 0x0002,
  EventNameType_SVGGraphic = 0x0004, // svg graphic elements
  EventNameType_SVGSVG = 0x0008, // the svg element
  EventNameType_SMIL = 0x0010, // smil elements
  EventNameType_HTMLBodyOrFramesetOnly = 0x0020,

  EventNameType_HTMLXUL = 0x0003,
  EventNameType_All = 0xFFFF
};

struct EventNameMapping
{
  // This holds pointers to nsGkAtoms members, and is therefore safe as a
  // non-owning reference.
  nsIAtom* MOZ_NON_OWNING_REF mAtom;
  int32_t  mType;
  mozilla::EventMessage mMessage;
  mozilla::EventClassID mEventClassID;
  // True if mAtom is possibly used by special SVG/SMIL events, but
  // mMessage is eUnidentifiedEvent. See EventNameList.h
  bool mMaybeSpecialSVGorSMILEvent;
};

typedef bool (*CallOnRemoteChildFunction) (mozilla::dom::TabParent* aTabParent,
                                           void* aArg);

class nsContentUtils
{
  friend class nsAutoScriptBlockerSuppressNodeRemoved;
  typedef mozilla::dom::Element Element;
  typedef mozilla::TimeDuration TimeDuration;

public:
  static nsresult Init();

  static bool     IsCallerChrome();
  static bool     ThreadsafeIsCallerChrome();
  static bool     IsCallerContentXBL();

  // In the traditional Gecko architecture, both C++ code and untrusted JS code
  // needed to rely on the same XPCOM method/getter/setter to get work done.
  // This required lots of security checks in the various exposed methods, which
  // in turn created difficulty in determining whether the caller was script
  // (whose access needed to be checked) and internal C++ platform code (whose
  // access did not need to be checked). To address this problem, Gecko had a
  // convention whereby the absence of script on the stack was interpretted as
  // "System Caller" and always granted unfettered access.
  //
  // Unfortunately, this created a bunch of footguns. For example, when the
  // implementation of a DOM method wanted to perform a privileged
  // sub-operation, it needed to "hide" the presence of script on the stack in
  // order for that sub-operation to be allowed. Additionally, if script could
  // trigger an API entry point to be invoked in some asynchronous way without
  // script on the stack, it could potentially perform privilege escalation.
  //
  // In the modern world, untrusted script should interact with the platform
  // exclusively over WebIDL APIs, and platform code has a lot more flexibility
  // in deciding whether or not to use XPCOM. This gives us the flexibility to
  // do something better.
  //
  // Going forward, APIs should be designed such that any security checks that
  // ask the question "is my caller allowed to do this?" should live in WebIDL
  // API entry points, with a separate method provided for internal callers
  // that just want to get the job done.
  //
  // To enforce this and catch bugs, nsContentUtils::SubjectPrincipal will crash
  // if it is invoked without script on the stack. To land that transition, it
  // was necessary to go through and whitelist a bunch of callers that were
  // depending on the old behavior. Those callers should be fixed up, and these
  // methods should not be used by new code without review from bholley or bz.
  static bool     LegacyIsCallerNativeCode() { return !GetCurrentJSContext(); }
  static bool     LegacyIsCallerChromeOrNativeCode() { return LegacyIsCallerNativeCode() || IsCallerChrome(); }
  static nsIPrincipal* SubjectPrincipalOrSystemIfNativeCaller()
  {
    if (!GetCurrentJSContext()) {
      return GetSystemPrincipal();
    }
    return SubjectPrincipal();
  }

  static bool LookupBindingMember(JSContext* aCx, nsIContent *aContent,
                                  JS::Handle<jsid> aId,
                                  JS::MutableHandle<JS::PropertyDescriptor> aDesc);

  // Check whether we should avoid leaking distinguishing information to JS/CSS.
  static bool ShouldResistFingerprinting(nsIDocShell* aDocShell);

  /**
   * Returns the parent node of aChild crossing document boundaries.
   * Uses the parent node in the composed document.
   */
  static nsINode* GetCrossDocParentNode(nsINode* aChild);

  /**
   * Do not ever pass null pointers to this method.  If one of your
   * nsIContents is null, you have to decide for yourself what
   * "IsDescendantOf" really means.
   *
   * @param  aPossibleDescendant node to test for being a descendant of
   *         aPossibleAncestor
   * @param  aPossibleAncestor node to test for being an ancestor of
   *         aPossibleDescendant
   * @return true if aPossibleDescendant is a descendant of
   *         aPossibleAncestor (or is aPossibleAncestor).  false
   *         otherwise.
   */
  static bool ContentIsDescendantOf(const nsINode* aPossibleDescendant,
                                      const nsINode* aPossibleAncestor);

  /**
   * Similar to ContentIsDescendantOf, except will treat an HTMLTemplateElement
   * or ShadowRoot as an ancestor of things in the corresponding DocumentFragment.
   * See the concept of "host-including inclusive ancestor" in the DOM
   * specification.
   */
  static bool ContentIsHostIncludingDescendantOf(
    const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor);

  /**
   * Similar to ContentIsDescendantOf except it crosses document boundaries,
   * this function uses ancestor/descendant relations in the composed document
   * (see shadow DOM spec).
   */
  static bool ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant,
                                              nsINode* aPossibleAncestor);

  /*
   * This method fills the |aArray| with all ancestor nodes of |aNode|
   * including |aNode| at the zero index.
   */
  static nsresult GetAncestors(nsINode* aNode,
                               nsTArray<nsINode*>& aArray);

  /*
   * This method fills |aAncestorNodes| with all ancestor nodes of |aNode|
   * including |aNode| (QI'd to nsIContent) at the zero index.
   * For each ancestor, there is a corresponding element in |aAncestorOffsets|
   * which is the IndexOf the child in relation to its parent.
   *
   * This method just sucks.
   */
  static nsresult GetAncestorsAndOffsets(nsIDOMNode* aNode,
                                         int32_t aOffset,
                                         nsTArray<nsIContent*>* aAncestorNodes,
                                         nsTArray<int32_t>* aAncestorOffsets);

  /*
   * The out parameter, |aCommonAncestor| will be the closest node, if any,
   * to both |aNode| and |aOther| which is also an ancestor of each.
   * Returns an error if the two nodes are disconnected and don't have
   * a common ancestor.
   */
  static nsresult GetCommonAncestor(nsIDOMNode *aNode,
                                    nsIDOMNode *aOther,
                                    nsIDOMNode** aCommonAncestor);

  /**
   * Returns the common ancestor, if any, for two nodes. Returns null if the
   * nodes are disconnected.
   */
  static nsINode* GetCommonAncestor(nsINode* aNode1,
                                    nsINode* aNode2);

  /**
   * Returns true if aNode1 is before aNode2 in the same connected
   * tree.
   */
  static bool PositionIsBefore(nsINode* aNode1, nsINode* aNode2);

  /**
   *  Utility routine to compare two "points", where a point is a
   *  node/offset pair
   *  Returns -1 if point1 < point2, 1, if point1 > point2,
   *  0 if error or if point1 == point2.
   *  NOTE! If the two nodes aren't in the same connected subtree,
   *  the result is 1, and the optional aDisconnected parameter
   *  is set to true.
   */
  static int32_t ComparePoints(nsINode* aParent1, int32_t aOffset1,
                               nsINode* aParent2, int32_t aOffset2,
                               bool* aDisconnected = nullptr);
  static int32_t ComparePoints(nsIDOMNode* aParent1, int32_t aOffset1,
                               nsIDOMNode* aParent2, int32_t aOffset2,
                               bool* aDisconnected = nullptr);

  /**
   * Brute-force search of the element subtree rooted at aContent for
   * an element with the given id.  aId must be nonempty, otherwise
   * this method may return nodes even if they have no id!
   */
  static Element* MatchElementId(nsIContent *aContent, const nsAString& aId);

  /**
   * Similar to above, but to be used if one already has an atom for the ID
   */
  static Element* MatchElementId(nsIContent *aContent, const nsIAtom* aId);

  /**
   * Reverses the document position flags passed in.
   *
   * @param   aDocumentPosition   The document position flags to be reversed.
   *
   * @return  The reversed document position flags.
   *
   * @see nsIDOMNode
   */
  static uint16_t ReverseDocumentPosition(uint16_t aDocumentPosition);

  /**
   * Returns a subdocument for aDocument with a particular outer window ID.
   *
   * @param aDocument
   *        The document whose subdocuments will be searched.
   * @param aOuterWindowID
   *        The outer window ID for the subdocument to be found. This must
   *        be a value greater than 0.
   * @return nsIDocument*
   *        A pointer to the found nsIDocument. nullptr if the subdocument
   *        cannot be found, or if either aDocument or aOuterWindowId were
   *        invalid. If the outer window ID belongs to aDocument itself, this
   *        will return a pointer to aDocument.
   */
  static nsIDocument* GetSubdocumentWithOuterWindowId(nsIDocument *aDocument,
                                                      uint64_t aOuterWindowId);

  static uint32_t CopyNewlineNormalizedUnicodeTo(const nsAString& aSource,
                                                 uint32_t aSrcOffset,
                                                 char16_t* aDest,
                                                 uint32_t aLength,
                                                 bool& aLastCharCR);

  static uint32_t CopyNewlineNormalizedUnicodeTo(nsReadingIterator<char16_t>& aSrcStart, const nsReadingIterator<char16_t>& aSrcEnd, nsAString& aDest);

  static const nsDependentSubstring TrimCharsInSet(const char* aSet,
                                                   const nsAString& aValue);

  template<bool IsWhitespace(char16_t)>
  static const nsDependentSubstring TrimWhitespace(const nsAString& aStr,
                                                   bool aTrimTrailing = true);

  /**
   * Returns true if aChar is of class Ps, Pi, Po, Pf, or Pe.
   */
  static bool IsFirstLetterPunctuation(uint32_t aChar);
  static bool IsFirstLetterPunctuationAt(const nsTextFragment* aFrag, uint32_t aOffset);

  /**
   * Returns true if aChar is of class Lu, Ll, Lt, Lm, Lo, Nd, Nl or No
   */
  static bool IsAlphanumeric(uint32_t aChar);
  static bool IsAlphanumericAt(const nsTextFragment* aFrag, uint32_t aOffset);

  /*
   * Is the character an HTML whitespace character?
   *
   * We define whitespace using the list in HTML5 and css3-selectors:
   * U+0009, U+000A, U+000C, U+000D, U+0020
   *
   * HTML 4.01 also lists U+200B (zero-width space).
   */
  static bool IsHTMLWhitespace(char16_t aChar);

  /*
   * Returns whether the character is an HTML whitespace (see IsHTMLWhitespace)
   * or a nbsp character (U+00A0).
   */
  static bool IsHTMLWhitespaceOrNBSP(char16_t aChar);

  /**
   * Is the HTML local name a block element?
   */
  static bool IsHTMLBlock(nsIContent* aContent);

  enum ParseHTMLIntegerResultFlags {
    eParseHTMLInteger_NoFlags               = 0,
    eParseHTMLInteger_IsPercent             = 1 << 0,
    // eParseHTMLInteger_NonStandard is set if the string representation of the
    // integer was not the canonical one (e.g. had extra leading '+' or '0').
    eParseHTMLInteger_NonStandard           = 1 << 1,
    eParseHTMLInteger_DidNotConsumeAllInput = 1 << 2,
    // Set if one or more error flags were set.
    eParseHTMLInteger_Error                 = 1 << 3,
    eParseHTMLInteger_ErrorNoValue          = 1 << 4,
    eParseHTMLInteger_ErrorOverflow         = 1 << 5,
    // Use this flag to detect the difference between overflow and underflow
    eParseHTMLInteger_Negative              = 1 << 6,
  };
  static int32_t ParseHTMLInteger(const nsAString& aValue,
                                  ParseHTMLIntegerResultFlags *aResult);

  /**
   * Parse a margin string of format 'top, right, bottom, left' into
   * an nsIntMargin.
   *
   * @param aString the string to parse
   * @param aResult the resulting integer
   * @return whether the value could be parsed
   */
  static bool ParseIntMarginValue(const nsAString& aString, nsIntMargin& aResult);

  /**
   * Parse the value of the <font size=""> attribute according to the HTML5
   * spec as of April 16, 2012.
   *
   * @param aValue the value to parse
   * @return 1 to 7, or 0 if the value couldn't be parsed
   */
  static int32_t ParseLegacyFontSize(const nsAString& aValue);

  static void Shutdown();

  /**
   * Checks whether two nodes come from the same origin.
   */
  static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
                                  nsIDOMNode* aUnTrustedNode);
  static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
                                  const nsINode* unTrustedNode);

  // Check if the (JS) caller can access aNode.
  static bool CanCallerAccess(nsIDOMNode *aNode);
  static bool CanCallerAccess(nsINode* aNode);

  // Check if the (JS) caller can access aWindow.
  // aWindow can be either outer or inner window.
  static bool CanCallerAccess(nsPIDOMWindowInner* aWindow);

  /**
   * GetDocumentFromCaller gets its document by looking at the last called
   * function and finding the document that the function itself relates to.
   * For example, consider two windows A and B in the same origin. B has a
   * function which does something that ends up needing the current document.
   * If a script in window A were to call B's function, GetDocumentFromCaller
   * would find that function (in B) and return B's document.
   *
   * @return The document or null if no JS Context.
   */
  static nsIDocument* GetDocumentFromCaller();

  // Check if a node is in the document prolog, i.e. before the document
  // element.
  static bool InProlog(nsINode *aNode);

  static nsIParserService* GetParserService();

  static nsNameSpaceManager* NameSpaceManager()
  {
    return sNameSpaceManager;
  }

  static nsIIOService* GetIOService()
  {
    return sIOService;
  }

  static nsIBidiKeyboard* GetBidiKeyboard();

  /**
   * Get the cache security manager service. Can return null if the layout
   * module has been shut down.
   */
  static nsIScriptSecurityManager* GetSecurityManager()
  {
    return sSecurityManager;
  }

  // Returns the subject principal. Guaranteed to return non-null. May only
  // be called when nsContentUtils is initialized.
  static nsIPrincipal* SubjectPrincipal();

  // Returns the prinipal of the given JS object. This may only be called on
  // the main thread for objects from the main thread's JSRuntime.
  static nsIPrincipal* ObjectPrincipal(JSObject* aObj);

  static nsresult GenerateStateKey(nsIContent* aContent,
                                   const nsIDocument* aDocument,
                                   nsACString& aKey);

  /**
   * Create a new nsIURI from aSpec, using aBaseURI as the base.  The
   * origin charset of the new nsIURI will be the document charset of
   * aDocument.
   */
  static nsresult NewURIWithDocumentCharset(nsIURI** aResult,
                                            const nsAString& aSpec,
                                            nsIDocument* aDocument,
                                            nsIURI* aBaseURI);

  /**
   * Convert aInput (in encoding aEncoding) to UTF16 in aOutput.
   *
   * @param aEncoding the Gecko-canonical name of the encoding or the empty
   *                  string (meaning UTF-8)
   */
  static nsresult ConvertStringFromEncoding(const nsACString& aEncoding,
                                            const char* aInput,
                                            uint32_t aInputLen,
                                            nsAString& aOutput);

  static nsresult ConvertStringFromEncoding(const nsACString& aEncoding,
                                            const nsACString& aInput,
                                            nsAString& aOutput) {
    return ConvertStringFromEncoding(
        aEncoding, aInput.BeginReading(), aInput.Length(), aOutput);
  }

  /**
   * Determine whether a buffer begins with a BOM for UTF-8, UTF-16LE,
   * UTF-16BE
   *
   * @param aBuffer the buffer to check
   * @param aLength the length of the buffer
   * @param aCharset empty if not found
   * @return boolean indicating whether a BOM was detected.
   */
  static bool CheckForBOM(const unsigned char* aBuffer, uint32_t aLength,
                          nsACString& aCharset);

  /**
   * Returns true if |aName| is a valid name to be registered via
   * document.registerElement.
   */
  static bool IsCustomElementName(nsIAtom* aName);

  static nsresult CheckQName(const nsAString& aQualifiedName,
                             bool aNamespaceAware = true,
                             const char16_t** aColon = nullptr);

  static nsresult SplitQName(const nsIContent* aNamespaceResolver,
                             const nsAFlatString& aQName,
                             int32_t *aNamespace, nsIAtom **aLocalName);

  static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI,
                                       const nsAString& aQualifiedName,
                                       nsNodeInfoManager* aNodeInfoManager,
                                       uint16_t aNodeType,
                                       mozilla::dom::NodeInfo** aNodeInfo);

  static void SplitExpatName(const char16_t *aExpatName, nsIAtom **aPrefix,
                             nsIAtom **aTagName, int32_t *aNameSpaceID);

  // Get a permission-manager setting for the given principal and type.
  // If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
  // returned, otherwise true is returned. Always returns true for the
  // system principal, and false for a null principal.
  static bool IsSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);

  // Get a permission-manager setting for the given principal and type.
  // If the pref doesn't exist or if it isn't DENY_ACTION, false is
  // returned, otherwise true is returned. Always returns false for the
  // system principal, and true for a null principal.
  static bool IsSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);

  // Get a permission-manager setting for the given principal and type.
  // If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
  // returned, otherwise true is returned. Always returns true for the
  // system principal, and false for a null principal.
  // This version checks the permission for an exact host match on
  // the principal
  static bool IsExactSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);

  // Get a permission-manager setting for the given principal and type.
  // If the pref doesn't exist or if it isn't DENY_ACTION, false is
  // returned, otherwise true is returned. Always returns false for the
  // system principal, and true for a null principal.
  // This version checks the permission for an exact host match on
  // the principal
  static bool IsExactSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);

  // Returns true if aDoc1 and aDoc2 have equal NodePrincipal()s.
  static bool HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2);

  static nsILineBreaker* LineBreaker()
  {
    return sLineBreaker;
  }

  static nsIWordBreaker* WordBreaker()
  {
    return sWordBreaker;
  }

  /**
   * Regster aObserver as a shutdown observer. A strong reference is held
   * to aObserver until UnregisterShutdownObserver is called.
   */
  static void RegisterShutdownObserver(nsIObserver* aObserver);
  static void UnregisterShutdownObserver(nsIObserver* aObserver);

  /**
   * @return true if aContent has an attribute aName in namespace aNameSpaceID,
   * and the attribute value is non-empty.
   */
  static bool HasNonEmptyAttr(const nsIContent* aContent, int32_t aNameSpaceID,
                                nsIAtom* aName);

  /**
   * Method that gets the primary presContext for the node.
   *
   * @param aContent The content node.
   * @return the presContext, or nullptr if the content is not in a document
   *         (if GetCurrentDoc returns nullptr)
   */
  static nsPresContext* GetContextForContent(const nsIContent* aContent);

  /**
   * Method to do security and content policy checks on the image URI
   *
   * @param aURI uri of the image to be loaded
   * @param aContext the context the image is loaded in (eg an element)
   * @param aLoadingDocument the document we belong to
   * @param aLoadingPrincipal the principal doing the load
   * @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
   *        The CP content type to use
   * @param aImageBlockingStatus the nsIContentPolicy blocking status for this
   *        image.  This will be set even if a security check fails for the
   *        image, to some reasonable REJECT_* value.  This out param will only
   *        be set if it's non-null.
   * @return true if the load can proceed, or false if it is blocked.
   *         Note that aImageBlockingStatus, if set will always be an ACCEPT
   *         status if true is returned and always be a REJECT_* status if
   *         false is returned.
   */
  static bool CanLoadImage(nsIURI* aURI,
                           nsISupports* aContext,
                           nsIDocument* aLoadingDocument,
                           nsIPrincipal* aLoadingPrincipal,
                           int16_t* aImageBlockingStatus = nullptr,
                           uint32_t aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE);

  /**
   * Returns true if objects in aDocument shouldn't initiate image loads.
   */
  static bool DocumentInactiveForImageLoads(nsIDocument* aDocument);

  /**
   * Method to start an image load.  This does not do any security checks.
   * This method will attempt to make aURI immutable; a caller that wants to
   * keep a mutable version around should pass in a clone.
   *
   * @param aURI uri of the image to be loaded
   * @param aContext element of document where the result of this request
   *                 will be used.
   * @param aLoadingDocument the document we belong to
   * @param aLoadingPrincipal the principal doing the load
   * @param aReferrer the referrer URI
   * @param aReferrerPolicy the referrer-sending policy to use on channel
   *         creation
   * @param aObserver the observer for the image load
   * @param aLoadFlags the load flags to use.  See nsIRequest
   * @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
   *        The CP content type to use
   * @return the imgIRequest for the image load
   */
  static nsresult LoadImage(nsIURI* aURI,
                            nsINode* aContext,
                            nsIDocument* aLoadingDocument,
                            nsIPrincipal* aLoadingPrincipal,
                            nsIURI* aReferrer,
                            mozilla::net::ReferrerPolicy aReferrerPolicy,
                            imgINotificationObserver* aObserver,
                            int32_t aLoadFlags,
                            const nsAString& initiatorType,
                            imgRequestProxy** aRequest,
                            uint32_t aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE);

  /**
   * Obtain an image loader that respects the given document/channel's privacy status.
   * Null document/channel arguments return the public image loader.
   */
  static imgLoader* GetImgLoaderForDocument(nsIDocument* aDoc);
  static imgLoader* GetImgLoaderForChannel(nsIChannel* aChannel,
                                           nsIDocument* aContext);

  /**
   * Returns whether the given URI is in the image cache.
   */
  static bool IsImageInCache(nsIURI* aURI, nsIDocument* aDocument);

  /**
   * Method to get an imgIContainer from an image loading content
   *
   * @param aContent The image loading content.  Must not be null.
   * @param aRequest The image request [out]
   * @return the imgIContainer corresponding to the first frame of the image
   */
  static already_AddRefed<imgIContainer> GetImageFromContent(nsIImageLoadingContent* aContent, imgIRequest **aRequest = nullptr);

  /**
   * Helper method to call imgIRequest::GetStaticRequest.
   */
  static already_AddRefed<imgRequestProxy> GetStaticRequest(imgRequestProxy* aRequest);

  /**
   * Method that decides whether a content node is draggable
   *
   * @param aContent The content node to test.
   * @return whether it's draggable
   */
  static bool ContentIsDraggable(nsIContent* aContent);

  /**
   * Method that decides whether a content node is a draggable image
   *
   * @param aContent The content node to test.
   * @return whether it's a draggable image
   */
  static bool IsDraggableImage(nsIContent* aContent);

  /**
   * Method that decides whether a content node is a draggable link
   *
   * @param aContent The content node to test.
   * @return whether it's a draggable link
   */
  static bool IsDraggableLink(const nsIContent* aContent);

  /**
   * Convenience method to create a new nodeinfo that differs only by name
   * from aNodeInfo.
   */
  static nsresult NameChanged(mozilla::dom::NodeInfo* aNodeInfo, nsIAtom* aName,
                              mozilla::dom::NodeInfo** aResult);

  /**
   * Returns the appropriate event argument names for the specified
   * namespace and event name.  Added because we need to switch between
   * SVG's "evt" and the rest of the world's "event", and because onerror
   * on window takes 5 args.
   */
  static void GetEventArgNames(int32_t aNameSpaceID, nsIAtom *aEventName,
                               bool aIsForWindow,
                               uint32_t *aArgCount, const char*** aArgNames);

  /**
   * Returns origin attributes of the document.
   **/
  static mozilla::PrincipalOriginAttributes
  GetOriginAttributes(nsIDocument* aDoc);

  /**
   * Returns origin attributes of the load group.
   **/
  static mozilla::PrincipalOriginAttributes
  GetOriginAttributes(nsILoadGroup* aLoadGroup);

  /**
   * Returns true if this document is in a Private Browsing window.
   */
  static bool IsInPrivateBrowsing(nsIDocument* aDoc);

  /**
   * Returns true if this loadGroup uses Private Browsing.
   */
  static bool IsInPrivateBrowsing(nsILoadGroup* aLoadGroup);

  /**
   * If aNode is not an element, return true exactly when aContent's binding
   * parent is null.
   *
   * If aNode is an element, return true exactly when aContent's binding parent
   * is the same as aNode's.
   *
   * This method is particularly useful for callers who are trying to ensure
   * that they are working with a non-anonymous descendant of a given node.  If
   * aContent is a descendant of aNode, a return value of false from this
   * method means that it's an anonymous descendant from aNode's point of view.
   *
   * Both arguments to this method must be non-null.
   */
  static bool IsInSameAnonymousTree(const nsINode* aNode, const nsIContent* aContent);

  /**
   * Return the nsIXPConnect service.
   */
  static nsIXPConnect *XPConnect()
  {
    return sXPConnect;
  }

  /**
   * Report simple error message to the browser console
   *   @param aErrorText the error message
   *   @param classification Name of the module reporting error
   */
  static void LogSimpleConsoleError(const nsAString& aErrorText,
                                    const char * classification);

  /**
   * Report a non-localized error message to the error console.
   *   @param aErrorText the error message
   *   @param aErrorFlags See nsIScriptError.
   *   @param aCategory Name of module reporting error.
   *   @param aDocument Reference to the document which triggered the message.
   *   @param [aURI=nullptr] (Optional) URI of resource containing error.
   *   @param [aSourceLine=EmptyString()] (Optional) The text of the line that
              contains the error (may be empty).
   *   @param [aLineNumber=0] (Optional) Line number within resource
              containing error.
   *   @param [aColumnNumber=0] (Optional) Column number within resource
              containing error.
              If aURI is null, then aDocument->GetDocumentURI() is used.
   *   @param [aLocationMode] (Optional) Specifies the behavior if
              error location information is omitted.
   */
  enum MissingErrorLocationMode {
    // Don't show location information in the error console.
    eOMIT_LOCATION,
    // Get location information from the currently executing script.
    eUSE_CALLING_LOCATION
  };
  static nsresult ReportToConsoleNonLocalized(const nsAString& aErrorText,
                                              uint32_t aErrorFlags,
                                              const nsACString& aCategory,
                                              const nsIDocument* aDocument,
                                              nsIURI* aURI = nullptr,
                                              const nsAFlatString& aSourceLine
                                                = EmptyString(),
                                              uint32_t aLineNumber = 0,
                                              uint32_t aColumnNumber = 0,
                                              MissingErrorLocationMode aLocationMode
                                                = eUSE_CALLING_LOCATION);

  /**
   * Report a localized error message to the error console.
   *   @param aErrorFlags See nsIScriptError.
   *   @param aCategory Name of module reporting error.
   *   @param aDocument Reference to the document which triggered the message.
   *   @param aFile Properties file containing localized message.
   *   @param aMessageName Name of localized message.
   *   @param [aParams=nullptr] (Optional) Parameters to be substituted into
              localized message.
   *   @param [aParamsLength=0] (Optional) Length of aParams.
   *   @param [aURI=nullptr] (Optional) URI of resource containing error.
   *   @param [aSourceLine=EmptyString()] (Optional) The text of the line that
              contains the error (may be empty).
   *   @param [aLineNumber=0] (Optional) Line number within resource
              containing error.
   *   @param [aColumnNumber=0] (Optional) Column number within resource
              containing error.
              If aURI is null, then aDocument->GetDocumentURI() is used.
   */
  enum PropertiesFile {
    eCSS_PROPERTIES,
    eXBL_PROPERTIES,
    eXUL_PROPERTIES,
    eLAYOUT_PROPERTIES,
    eFORMS_PROPERTIES,
    ePRINTING_PROPERTIES,
    eDOM_PROPERTIES,
    eHTMLPARSER_PROPERTIES,
    eSVG_PROPERTIES,
    eBRAND_PROPERTIES,
    eCOMMON_DIALOG_PROPERTIES,
    eMATHML_PROPERTIES,
    eSECURITY_PROPERTIES,
    eNECKO_PROPERTIES,
    PropertiesFile_COUNT
  };
  static nsresult ReportToConsole(uint32_t aErrorFlags,
                                  const nsACString& aCategory,
                                  const nsIDocument* aDocument,
                                  PropertiesFile aFile,
                                  const char *aMessageName,
                                  const char16_t **aParams = nullptr,
                                  uint32_t aParamsLength = 0,
                                  nsIURI* aURI = nullptr,
                                  const nsAFlatString& aSourceLine
                                    = EmptyString(),
                                  uint32_t aLineNumber = 0,
                                  uint32_t aColumnNumber = 0);

  static void LogMessageToConsole(const char* aMsg);

  /**
   * Get the localized string named |aKey| in properties file |aFile|.
   */
  static nsresult GetLocalizedString(PropertiesFile aFile,
                                     const char* aKey,
                                     nsXPIDLString& aResult);

  /**
   * A helper function that parses a sandbox attribute (of an <iframe> or a CSP
   * directive) and converts it to the set of flags used internally.
   *
   * @param aSandboxAttr  the sandbox attribute
   * @return              the set of flags (SANDBOXED_NONE if aSandboxAttr is
   *                      null)
   */
  static uint32_t ParseSandboxAttributeToFlags(const nsAttrValue* aSandboxAttr);

  /**
   * A helper function that checks if a string matches a valid sandbox flag.
   *
   * @param aFlag   the potential sandbox flag.
   * @return        true if the flag is a sandbox flag.
   */
  static bool IsValidSandboxFlag(const nsAString& aFlag);

  /**
   * A helper function that returns a string attribute corresponding to the
   * sandbox flags.
   *
   * @param aFlags    the sandbox flags
   * @param aString   the attribute corresponding to the flags (null if aFlags
   *                  is zero)
   */
  static void SandboxFlagsToString(uint32_t aFlags, nsAString& aString);

  /**
   * Helper function that generates a UUID.
   */
  static nsresult GenerateUUIDInPlace(nsID& aUUID);

  static bool PrefetchEnabled(nsIDocShell* aDocShell);

  static nsresult CalculateBufferSizeForImage(const uint32_t& aStride,
                                              const mozilla::gfx::IntSize& aImageSize,
                                              const mozilla::gfx::SurfaceFormat& aFormat,
                                              size_t* aMaxBufferSize,
                                              size_t* aUsedBufferSize);

private:
  /**
   * Fill (with the parameters given) the localized string named |aKey| in
   * properties file |aFile|.
   */
  static nsresult FormatLocalizedString(PropertiesFile aFile,
                                        const char* aKey,
                                        const char16_t** aParams,
                                        uint32_t aParamsLength,
                                        nsXPIDLString& aResult);

public:
  template<uint32_t N>
  static nsresult FormatLocalizedString(PropertiesFile aFile,
                                        const char* aKey,
                                        const char16_t* (&aParams)[N],
                                        nsXPIDLString& aResult)
  {
    return FormatLocalizedString(aFile, aKey, aParams, N, aResult);
  }

  /**
   * Fill (with the parameters given) the localized string named |aKey| in
   * properties file |aFile| consuming an nsTArray of nsString parameters rather
   * than a char16_t** for the sake of avoiding use-after-free errors involving
   * temporaries.
   */
  static nsresult FormatLocalizedString(PropertiesFile aFile,
                                        const char* aKey,
                                        const nsTArray<nsString>& aParamArray,
                                        nsXPIDLString& aResult);

  /**
   * Returns true if aDocument is a chrome document
   */
  static bool IsChromeDoc(nsIDocument *aDocument);

  /**
   * Returns true if aDocument is in a docshell whose parent is the same type
   */
  static bool IsChildOfSameType(nsIDocument* aDoc);

  /**
   * Returns true if the content-type will be rendered as plain-text.
   */
  static bool IsPlainTextType(const nsACString& aContentType);

  /**
   * Get the script file name to use when compiling the script
   * referenced by aURI. In cases where there's no need for any extra
   * security wrapper automation the script file name that's returned
   * will be the spec in aURI, else it will be the spec in aDocument's
   * URI followed by aURI's spec, separated by " -> ". Returns true
   * if the script file name was modified, false if it's aURI's
   * spec.
   */
  static bool GetWrapperSafeScriptFilename(nsIDocument *aDocument,
                                             nsIURI *aURI,
                                             nsACString& aScriptURI,
                                             nsresult* aRv);


  /**
   * Returns true if aDocument belongs to a chrome docshell for
   * display purposes.  Returns false for null documents or documents
   * which do not belong to a docshell.
   */
  static bool IsInChromeDocshell(nsIDocument *aDocument);

  /**
   * Return the content policy service
   */
  static nsIContentPolicy *GetContentPolicy();

  /**
   * Map internal content policy types to external ones.
   */
  static nsContentPolicyType InternalContentPolicyTypeToExternal(nsContentPolicyType aType);

  /**
   * Map internal content policy types to external ones or preload types:
   *   * TYPE_INTERNAL_SCRIPT_PRELOAD
   *   * TYPE_INTERNAL_IMAGE_PRELOAD
   *   * TYPE_INTERNAL_STYLESHEET_PRELOAD
   *
   * Note: DO NOT call this function unless you know what you're doing!
   */
  static nsContentPolicyType InternalContentPolicyTypeToExternalOrPreload(nsContentPolicyType aType);

  /**
   * Map internal content policy types to external ones, worker, or preload types:
   *   * TYPE_INTERNAL_WORKER
   *   * TYPE_INTERNAL_SHARED_WORKER
   *   * TYPE_INTERNAL_SERVICE_WORKER
   *
   * Note: DO NOT call this function unless you know what you're doing!
   */
  static nsContentPolicyType InternalContentPolicyTypeToExternalOrWorker(nsContentPolicyType aType);

  /**
   * Returns true if the content policy type is any of:
   *   * TYPE_INTERNAL_SCRIPT_PRELOAD
   *   * TYPE_INTERNAL_IMAGE_PRELOAD
   *   * TYPE_INTERNAL_STYLESHEET_PRELOAD
   */
  static bool IsPreloadType(nsContentPolicyType aType);

  /**
   * Quick helper to determine whether there are any mutation listeners
   * of a given type that apply to this content or any of its ancestors.
   * The method has the side effect to call document's MayDispatchMutationEvent
   * using aTargetForSubtreeModified as the parameter.
   *
   * @param aNode  The node to search for listeners
   * @param aType  The type of listener (NS_EVENT_BITS_MUTATION_*)
   * @param aTargetForSubtreeModified The node which is the target of the
   *                                  possible DOMSubtreeModified event.
   *
   * @return true if there are mutation listeners of the specified type
   */
  static bool HasMutationListeners(nsINode* aNode,
                                     uint32_t aType,
                                     nsINode* aTargetForSubtreeModified);

  /**
   * Quick helper to determine whether there are any mutation listeners
   * of a given type that apply to any content in this document. It is valid
   * to pass null for aDocument here, in which case this function always
   * returns true.
   *
   * @param aDocument The document to search for listeners
   * @param aType     The type of listener (NS_EVENT_BITS_MUTATION_*)
   *
   * @return true if there are mutation listeners of the specified type
   */
  static bool HasMutationListeners(nsIDocument* aDocument,
                                     uint32_t aType);
  /**
   * Synchronously fire DOMNodeRemoved on aChild. Only fires the event if
   * there really are listeners by checking using the HasMutationListeners
   * function above. The function makes sure to hold the relevant objects alive
   * for the duration of the event firing. However there are no guarantees
   * that any of the objects are alive by the time the function returns.
   * If you depend on that you need to hold references yourself.
   *
   * @param aChild    The node to fire DOMNodeRemoved at.
   * @param aParent   The parent of aChild.
   * @param aOwnerDoc The ownerDocument of aChild.
   */
  static void MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent,
                                   nsIDocument* aOwnerDoc);

  /**
   * This method creates and dispatches a trusted event.
   * Works only with events which can be created by calling
   * nsIDOMDocument::CreateEvent() with parameter "Events".
   * @param aDoc           The document which will be used to create the event.
   * @param aTarget        The target of the event, should be QIable to
   *                       nsIDOMEventTarget.
   * @param aEventName     The name of the event.
   * @param aCanBubble     Whether the event can bubble.
   * @param aCancelable    Is the event cancelable.
   * @param aDefaultAction Set to true if default action should be taken,
   *                       see nsIDOMEventTarget::DispatchEvent.
   */
  static nsresult DispatchTrustedEvent(nsIDocument* aDoc,
                                       nsISupports* aTarget,
                                       const nsAString& aEventName,
                                       bool aCanBubble,
                                       bool aCancelable,
                                       bool *aDefaultAction = nullptr);

  /**
   * This method creates and dispatches a untrusted event.
   * Works only with events which can be created by calling
   * nsIDOMDocument::CreateEvent() with parameter "Events".
   * @param aDoc           The document which will be used to create the event.
   * @param aTarget        The target of the event, should be QIable to
   *                       nsIDOMEventTarget.
   * @param aEventName     The name of the event.
   * @param aCanBubble     Whether the event can bubble.
   * @param aCancelable    Is the event cancelable.
   * @param aDefaultAction Set to true if default action should be taken,
   *                       see nsIDOMEventTarget::DispatchEvent.
   */
  static nsresult DispatchUntrustedEvent(nsIDocument* aDoc,
                                         nsISupports* aTarget,
                                         const nsAString& aEventName,
                                         bool aCanBubble,
                                         bool aCancelable,
                                         bool *aDefaultAction = nullptr);

  /**
   * This method creates and dispatches a trusted event to the chrome
   * event handler (the parent object of the DOM Window in the event target
   * chain). Note, chrome event handler is used even if aTarget is a chrome
   * object. Use DispatchEventOnlyToChrome if the normal event dispatching is
   * wanted in case aTarget is a chrome object.
   * Works only with events which can be created by calling
   * nsIDOMDocument::CreateEvent() with parameter "Events".
   * @param aDocument      The document which will be used to create the event,
   *                       and whose window's chrome handler will be used to
   *                       dispatch the event.
   * @param aTarget        The target of the event, used for event->SetTarget()
   * @param aEventName     The name of the event.
   * @param aCanBubble     Whether the event can bubble.
   * @param aCancelable    Is the event cancelable.
   * @param aDefaultAction Set to true if default action should be taken,
   *                       see nsIDOMEventTarget::DispatchEvent.
   */
  static nsresult DispatchChromeEvent(nsIDocument* aDoc,
                                      nsISupports* aTarget,
                                      const nsAString& aEventName,
                                      bool aCanBubble,
                                      bool aCancelable,
                                      bool *aDefaultAction = nullptr);

  /**
   * Helper function for dispatching a "DOMServiceWorkerFocusClient" event to
   * the chrome event handler of the given DOM Window. This has the effect
   * of focusing the corresponding tab and bringing the browser window
   * to the foreground.
   */
  static nsresult DispatchFocusChromeEvent(nsPIDOMWindowOuter* aWindow);

  /**
   * This method creates and dispatches a trusted event.
   * If aTarget is not a chrome object, the nearest chrome object in the
   * propagation path will be used as the start of the event target chain.
   * This method is different than DispatchChromeEvent, which always dispatches
   * events to chrome event handler. DispatchEventOnlyToChrome works like
   * DispatchTrustedEvent in the case aTarget is a chrome object.
   * Works only with events which can be created by calling
   * nsIDOMDocument::CreateEvent() with parameter "Events".
   * @param aDoc           The document which will be used to create the event.
   * @param aTarget        The target of the event, should be QIable to
   *                       nsIDOMEventTarget.
   * @param aEventName     The name of the event.
   * @param aCanBubble     Whether the event can bubble.
   * @param aCancelable    Is the event cancelable.
   * @param aDefaultAction Set to true if default action should be taken,
   *                       see nsIDOMEventTarget::DispatchEvent.
   */
  static nsresult DispatchEventOnlyToChrome(nsIDocument* aDoc,
                                            nsISupports* aTarget,
                                            const nsAString& aEventName,
                                            bool aCanBubble,
                                            bool aCancelable,
                                            bool *aDefaultAction = nullptr);

  /**
   * Determines if an event attribute name (such as onclick) is valid for
   * a given element type. Types are from the EventNameType enumeration
   * defined above.
   *
   * @param aName the event name to look up
   * @param aType the type of content
   */
  static bool IsEventAttributeName(nsIAtom* aName, int32_t aType);

  /**
   * Return the event message for the event with the given name. The name is
   * the event name with the 'on' prefix. Returns eUnidentifiedEvent if the
   * event doesn't match a known event name.
   *
   * @param aName the event name to look up
   */
  static mozilla::EventMessage GetEventMessage(nsIAtom* aName);

  /**
   * Returns the EventMessage and nsIAtom to be used for event listener
   * registration.
   */
  static mozilla::EventMessage
  GetEventMessageAndAtomForListener(const nsAString& aName, nsIAtom** aOnName);

  /**
   * Return the EventClassID for the event with the given name. The name is the
   * event name *without* the 'on' prefix. Returns eBasicEventClass if the event
   * is not known to be of any particular event class.
   *
   * @param aName the event name to look up
   */
  static mozilla::EventClassID GetEventClassID(const nsAString& aName);

  /**
   * Return the event message and atom for the event with the given name.
   * The name is the event name *without* the 'on' prefix.
   * Returns eUnidentifiedEvent on the aEventID if the
   * event doesn't match a known event name in the category.
   *
   * @param aName the event name to look up
   * @param aEventClassID only return event id for aEventClassID
   */
  static nsIAtom* GetEventMessageAndAtom(const nsAString& aName,
                                         mozilla::EventClassID aEventClassID,
                                         mozilla::EventMessage* aEventMessage);

  /**
   * Used only during traversal of the XPCOM graph by the cycle
   * collector: push a pointer to the listener manager onto the
   * children deque, if it exists. Do nothing if there is no listener
   * manager.
   *
   * Crucially: does not perform any refcounting operations.
   *
   * @param aNode The node to traverse.
   * @param children The buffer to push a listener manager pointer into.
   */
  static void TraverseListenerManager(nsINode *aNode,
                                      nsCycleCollectionTraversalCallback &cb);

  /**
   * Get the eventlistener manager for aNode, creating it if it does not
   * already exist.
   *
   * @param aNode The node for which to get the eventlistener manager.
   */
  static mozilla::EventListenerManager*
    GetListenerManagerForNode(nsINode* aNode);
  /**
   * Get the eventlistener manager for aNode, returning null if it does not
   * already exist.
   *
   * @param aNode The node for which to get the eventlistener manager.
   */
  static mozilla::EventListenerManager*
    GetExistingListenerManagerForNode(const nsINode* aNode);

  static void UnmarkGrayJSListenersInCCGenerationDocuments();

  /**
   * Remove the eventlistener manager for aNode.
   *
   * @param aNode The node for which to remove the eventlistener manager.
   */
  static void RemoveListenerManager(nsINode *aNode);

  static bool IsInitialized()
  {
    return sInitialized;
  }

  /**
   * Checks if the localname/prefix/namespace triple is valid wrt prefix
   * and namespace according to the Namespaces in XML and DOM Code
   * specfications.
   *
   * @param aLocalname localname of the node
   * @param aPrefix prefix of the node
   * @param aNamespaceID namespace of the node
   */
  static bool IsValidNodeName(nsIAtom *aLocalName, nsIAtom *aPrefix,
                                int32_t aNamespaceID);

  /**
   * Creates a DocumentFragment from text using a context node to resolve
   * namespaces.
   *
   * Note! In the HTML case with the HTML5 parser enabled, this is only called
   * from Range.createContextualFragment() and the implementation here is
   * quirky accordingly (html context node behaves like a body context node).
   * If you don't want that quirky behavior, don't use this method as-is!
   *
   * @param aContextNode the node which is used to resolve namespaces
   * @param aFragment the string which is parsed to a DocumentFragment
   * @param aReturn the resulting fragment
   * @param aPreventScriptExecution whether to mark scripts as already started
   */
  static nsresult CreateContextualFragment(nsINode* aContextNode,
                                           const nsAString& aFragment,
                                           bool aPreventScriptExecution,
                                           nsIDOMDocumentFragment** aReturn);
  static already_AddRefed<mozilla::dom::DocumentFragment>
  CreateContextualFragment(nsINode* aContextNode, const nsAString& aFragment,
                           bool aPreventScriptExecution,
                           mozilla::ErrorResult& aRv);

  /**
   * Invoke the fragment parsing algorithm (innerHTML) using the HTML parser.
   *
   * @param aSourceBuffer the string being set as innerHTML
   * @param aTargetNode the target container
   * @param aContextLocalName local name of context node
   * @param aContextNamespace namespace of context node
   * @param aQuirks true to make <table> not close <p>
   * @param aPreventScriptExecution true to prevent scripts from executing;
   *        don't set to false when parsing into a target node that has been
   *        bound to tree.
   * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
   *         fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
   *         long and NS_OK otherwise.
   */
  static nsresult ParseFragmentHTML(const nsAString& aSourceBuffer,
                                    nsIContent* aTargetNode,
                                    nsIAtom* aContextLocalName,
                                    int32_t aContextNamespace,
                                    bool aQuirks,
                                    bool aPreventScriptExecution);

  /**
   * Invoke the fragment parsing algorithm (innerHTML) using the XML parser.
   *
   * @param aSourceBuffer the string being set as innerHTML
   * @param aTargetNode the target container
   * @param aTagStack the namespace mapping context
   * @param aPreventExecution whether to mark scripts as already started
   * @param aReturn the result fragment
   * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
   *         fragments is made, a return code from the XML parser.
   */
  static nsresult ParseFragmentXML(const nsAString& aSourceBuffer,
                                   nsIDocument* aDocument,
                                   nsTArray<nsString>& aTagStack,
                                   bool aPreventScriptExecution,
                                   nsIDOMDocumentFragment** aReturn);

  /**
   * Parse a string into a document using the HTML parser.
   * Script elements are marked unexecutable.
   *
   * @param aSourceBuffer the string to parse as an HTML document
   * @param aTargetDocument the document object to parse into. Must not have
   *                        child nodes.
   * @param aScriptingEnabledForNoscriptParsing whether <noscript> is parsed
   *                                            as if scripting was enabled
   * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
   *         fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
   *         long and NS_OK otherwise.
   */
  static nsresult ParseDocumentHTML(const nsAString& aSourceBuffer,
                                    nsIDocument* aTargetDocument,
                                    bool aScriptingEnabledForNoscriptParsing);

  /**
   * Converts HTML source to plain text by parsing the source and using the
   * plain text serializer on the resulting tree.
   *
   * @param aSourceBuffer the string to parse as an HTML document
   * @param aResultBuffer the string where the plain text result appears;
   *                      may be the same string as aSourceBuffer
   * @param aFlags Flags from nsIDocumentEncoder.
   * @param aWrapCol Number of columns after which to line wrap; 0 for no
   *                 auto-wrapping
   * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
   *         fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
   *         long and NS_OK otherwise.
   */
  static nsresult ConvertToPlainText(const nsAString& aSourceBuffer,
                                     nsAString& aResultBuffer,
                                     uint32_t aFlags,
                                     uint32_t aWrapCol);

  /**
   * Sets the text contents of a node by replacing all existing children
   * with a single text child.
   *
   * The function always notifies.
   *
   * Will reuse the first text child if one is available. Will not reuse
   * existing cdata children.
   *
   * @param aContent Node to set contents of.
   * @param aValue   Value to set contents to.
   * @param aTryReuse When true, the function will try to reuse an existing
   *                  textnodes rather than always creating a new one.
   */
  static nsresult SetNodeTextContent(nsIContent* aContent,
                                     const nsAString& aValue,
                                     bool aTryReuse);

  /**
   * Get the textual contents of a node. This is a concatenation of all
   * textnodes that are direct or (depending on aDeep) indirect children
   * of the node.
   *
   * NOTE! No serialization takes place and <br> elements
   * are not converted into newlines. Only textnodes and cdata nodes are
   * added to the result.
   *
   * @see nsLayoutUtils::GetFrameTextContent
   *
   * @param aNode Node to get textual contents of.
   * @param aDeep If true child elements of aNode are recursivly descended
   *              into to find text children.
   * @param aResult the result. Out param.
   * @return false on out of memory errors, true otherwise.
   */
  MOZ_MUST_USE
  static bool GetNodeTextContent(nsINode* aNode, bool aDeep,
                                 nsAString& aResult, const mozilla::fallible_t&);

  static void GetNodeTextContent(nsINode* aNode, bool aDeep,
                                 nsAString& aResult);

  /**
   * Same as GetNodeTextContents but appends the result rather than sets it.
   */
  static bool AppendNodeTextContent(nsINode* aNode, bool aDeep,
                                    nsAString& aResult, const mozilla::fallible_t&);

  /**
   * Utility method that checks if a given node has any non-empty children. This
   * method does not descend recursively into children by default.
   *
   * @param aDiscoverMode Set to eRecurseIntoChildren to descend recursively
   * into children.
   */
  enum TextContentDiscoverMode : uint8_t {
    eRecurseIntoChildren, eDontRecurseIntoChildren
  };

  static bool HasNonEmptyTextContent(
    nsINode* aNode,
    TextContentDiscoverMode aDiscoverMode = eDontRecurseIntoChildren);

  /**
   * Delete strings allocated for nsContentList matches
   */
  static void DestroyMatchString(void* aData);

  /**
   * Unbinds the content from the tree and nulls it out if it's not null.
   */
  static void DestroyAnonymousContent(nsCOMPtr<nsIContent>* aContent);
  static void DestroyAnonymousContent(nsCOMPtr<Element>* aElement);

  /*
   * Notify when the first XUL menu is opened and when the all XUL menus are
   * closed. At opening, aInstalling should be TRUE, otherwise, it should be
   * FALSE.
   */
  static void NotifyInstalledMenuKeyboardListener(bool aInstalling);

  /**
   * Returns true if aPrincipal is the system principal.
   */
  static bool IsSystemPrincipal(nsIPrincipal* aPrincipal);

  /**
   * Returns true if aPrincipal is an nsExpandedPrincipal.
   */
  static bool IsExpandedPrincipal(nsIPrincipal* aPrincipal);

  /**
   * Returns true if aPrincipal is the system or an nsExpandedPrincipal.
   */
  static bool IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal)
  {
    return IsSystemPrincipal(aPrincipal) || IsExpandedPrincipal(aPrincipal);
  }

  /**
   * Gets the system principal from the security manager.
   */
  static nsIPrincipal* GetSystemPrincipal();

  /**
   * Gets the null subject principal singleton. This is only useful for
   * assertions.
   */
  static nsIPrincipal* GetNullSubjectPrincipal() { return sNullSubjectPrincipal; }

  /**
   * *aResourcePrincipal is a principal describing who may access the contents
   * of a resource. The resource can only be consumed by a principal that
   * subsumes *aResourcePrincipal. MAKE SURE THAT NOTHING EVER ACTS WITH THE
   * AUTHORITY OF *aResourcePrincipal.
   * It may be null to indicate that the resource has no data from any origin
   * in it yet and anything may access the resource.
   * Additional data is being mixed into the resource from aExtraPrincipal
   * (which may be null; if null, no data is being mixed in and this function
   * will do nothing). Update *aResourcePrincipal to reflect the new data.
   * If *aResourcePrincipal subsumes aExtraPrincipal, nothing needs to change,
   * otherwise *aResourcePrincipal is replaced with the system principal.
   * Returns true if *aResourcePrincipal changed.
   */
  static bool CombineResourcePrincipals(nsCOMPtr<nsIPrincipal>* aResourcePrincipal,
                                        nsIPrincipal* aExtraPrincipal);

  /**
   * Trigger a link with uri aLinkURI. If aClick is false, this triggers a
   * mouseover on the link, otherwise it triggers a load after doing a
   * security check using aContent's principal.
   *
   * @param aContent the node on which a link was triggered.
   * @param aPresContext the pres context, must be non-null.
   * @param aLinkURI the URI of the link, must be non-null.
   * @param aTargetSpec the target (like target=, may be empty).
   * @param aClick whether this was a click or not (if false, this method
   *               assumes you just hovered over the link).
   * @param aIsUserTriggered whether the user triggered the link. This would be
   *                         false for loads from auto XLinks or from the
   *                         click() method if we ever implement it.
   * @param aIsTrusted If false, JS Context will be pushed to stack
   *                   when the link is triggered.
   */
  static void TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
                          nsIURI *aLinkURI, const nsString& aTargetSpec,
                          bool aClick, bool aIsUserTriggered,
                          bool aIsTrusted);

  /**
   * Get the link location.
   */
  static void GetLinkLocation(mozilla::dom::Element* aElement,
                              nsString& aLocationString);

  /**
   * Return top-level widget in the parent chain.
   */
  static nsIWidget* GetTopLevelWidget(nsIWidget* aWidget);

  /**
   * Return the localized ellipsis for UI.
   */
  static const nsDependentString GetLocalizedEllipsis();

  /**
   * Hide any XUL popups associated with aDocument, including any documents
   * displayed in child frames. Does nothing if aDocument is null.
   */
  static void HidePopupsInDocument(nsIDocument* aDocument);

  /**
   * Retrieve the current drag session, or null if no drag is currently occuring
   */
  static already_AddRefed<nsIDragSession> GetDragSession();

  /*
   * Initialize and set the dataTransfer field of an WidgetDragEvent.
   */
  static nsresult SetDataTransferInEvent(mozilla::WidgetDragEvent* aDragEvent);

  // filters the drag and drop action to fit within the effects allowed and
  // returns it.
  static uint32_t FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed);

  /*
   * Return true if the target of a drop event is a content document that is
   * an ancestor of the document for the source of the drag.
   */
  static bool CheckForSubFrameDrop(nsIDragSession* aDragSession,
                                   mozilla::WidgetDragEvent* aDropEvent);

  /**
   * Return true if aURI is a local file URI (i.e. file://).
   */
  static bool URIIsLocalFile(nsIURI *aURI);

  /**
   * Get the application manifest URI for this document.  The manifest URI
   * is specified in the manifest= attribute of the root element of the
   * document.
   *
   * @param aDocument The document that lists the manifest.
   * @param aURI The manifest URI.
   */
  static void GetOfflineAppManifest(nsIDocument *aDocument, nsIURI **aURI);

  /**
   * Check whether an application should be allowed to use offline APIs.
   */
  static bool OfflineAppAllowed(nsIURI *aURI);

  /**
   * Check whether an application should be allowed to use offline APIs.
   */
  static bool OfflineAppAllowed(nsIPrincipal *aPrincipal);

  /**
   * If offline-apps.allow_by_default is true, we set offline-app permission
   * for the principal and return true.  Otherwise false.
   */
  static bool MaybeAllowOfflineAppByDefault(nsIPrincipal *aPrincipal);

  /**
   * Increases the count of blockers preventing scripts from running.
   * NOTE: You might want to use nsAutoScriptBlocker rather than calling
   * this directly
   */
  static void AddScriptBlocker();

  /**
   * Decreases the count of blockers preventing scripts from running.
   * NOTE: You might want to use nsAutoScriptBlocker rather than calling
   * this directly
   *
   * WARNING! Calling this function could synchronously execute scripts.
   */
  static void RemoveScriptBlocker();

  /**
   * Add a runnable that is to be executed as soon as it's safe to execute
   * scripts.
   * NOTE: If it's currently safe to execute scripts, aRunnable will be run
   *       synchronously before the function returns.
   *
   * @param aRunnable  The nsIRunnable to run as soon as it's safe to execute
   *                   scripts. Passing null is allowed and results in nothing
   *                   happening. It is also allowed to pass an object that
   *                   has not yet been AddRefed.
   */
  static void AddScriptRunner(already_AddRefed<nsIRunnable> aRunnable);
  static void AddScriptRunner(nsIRunnable* aRunnable);

  /**
   * Returns true if it's safe to execute content script and false otherwise.
   *
   * The only known case where this lies is mutation events. They run, and can
   * run anything else, when this function returns false, but this is ok.
   */
  static bool IsSafeToRunScript() {
    return sScriptBlockerCount == 0;
  }

  // XXXcatalinb: workaround for weird include error when trying to reference
  // ipdl types in WindowWatcher.
  static nsIWindowProvider*
  GetWindowProviderForContentProcess();

  // Returns the browser window with the most recent time stamp that is
  // not in private browsing mode.
  static already_AddRefed<nsPIDOMWindowOuter>
  GetMostRecentNonPBWindow();

  /**
   * Call this function if !IsSafeToRunScript() and we fail to run the script
   * (rather than using AddScriptRunner as we usually do). |aDocument| is
   * optional as it is only used for showing the URL in the console.
   */
  static void WarnScriptWasIgnored(nsIDocument* aDocument);

  /**
   * Add a "synchronous section", in the form of an nsIRunnable run once the
   * event loop has reached a "stable state". |aRunnable| must not cause any
   * queued events to be processed (i.e. must not spin the event loop).
   * We've reached a stable state when the currently executing task/event has
   * finished, see
   * http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section
   * In practice this runs aRunnable once the currently executing event
   * finishes. If called multiple times per task/event, all the runnables will
   * be executed, in the order in which RunInStableState() was called.
   */
  static void RunInStableState(already_AddRefed<nsIRunnable> aRunnable);

  /* Add a "synchronous section", in the form of an nsIRunnable run once the
   * event loop has reached a "metastable state". |aRunnable| must not cause any
   * queued events to be processed (i.e. must not spin the event loop).
   * We've reached a metastable state when the currently executing task or
   * microtask has finished.  This is not specced at this time.
   * In practice this runs aRunnable once the currently executing task or
   * microtask finishes.  If called multiple times per microtask, all the
   * runnables will be executed, in the order in which RunInMetastableState()
   * was called
   */
  static void RunInMetastableState(already_AddRefed<nsIRunnable> aRunnable);

  /* Process viewport META data. This gives us information for the scale
   * and zoom of a page on mobile devices. We stick the information in
   * the document header and use it later on after rendering.
   *
   * See Bug #436083
   */
  static nsresult ProcessViewportInfo(nsIDocument *aDocument,
                                      const nsAString &viewportInfo);

  static nsIScriptContext* GetContextForEventHandlers(nsINode* aNode,
                                                      nsresult* aRv);

  static JSContext *GetCurrentJSContext();
  static JSContext *GetCurrentJSContextForThread();

  /**
   * Case insensitive comparison between two strings. However it only ignores
   * case for ASCII characters a-z.
   */
  static bool EqualsIgnoreASCIICase(const nsAString& aStr1,
                                    const nsAString& aStr2);

  /**
   * Convert ASCII A-Z to a-z.
   */
  static void ASCIIToLower(nsAString& aStr);
  static void ASCIIToLower(nsACString& aStr);
  static void ASCIIToLower(const nsAString& aSource, nsAString& aDest);
  static void ASCIIToLower(const nsACString& aSource, nsACString& aDest);

  /**
   * Convert ASCII a-z to A-Z.
   */
  static void ASCIIToUpper(nsAString& aStr);
  static void ASCIIToUpper(nsACString& aStr);
  static void ASCIIToUpper(const nsAString& aSource, nsAString& aDest);
  static void ASCIIToUpper(const nsACString& aSource, nsACString& aDest);

  /**
   * Return whether aStr contains an ASCII uppercase character.
   */
  static bool StringContainsASCIIUpper(const nsAString& aStr);

  // Returns NS_OK for same origin, error (NS_ERROR_DOM_BAD_URI) if not.
  static nsresult CheckSameOrigin(nsIChannel *aOldChannel, nsIChannel *aNewChannel);
  static nsIInterfaceRequestor* SameOriginChecker();

  /**
   * Get the Origin of the passed in nsIPrincipal or nsIURI. If the passed in
   * nsIURI or the URI of the passed in nsIPrincipal does not have a host, the
   * origin is set to 'null'.
   *
   * The ASCII versions return a ASCII strings that are puny-code encoded,
   * suitable for, for example, header values. The UTF versions return strings
   * containing international characters.
   *
   * @pre aPrincipal/aOrigin must not be null.
   *
   * @note this should be used for HTML5 origin determination.
   */
  static nsresult GetASCIIOrigin(nsIPrincipal* aPrincipal,
                                 nsACString& aOrigin);
  static nsresult GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin);
  static nsresult GetUTFOrigin(nsIPrincipal* aPrincipal,
                               nsAString& aOrigin);
  static nsresult GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin);

  /**
   * This method creates and dispatches "command" event, which implements
   * nsIDOMXULCommandEvent.
   * If aShell is not null, dispatching goes via
   * nsIPresShell::HandleDOMEventWithTarget.
   */
  static nsresult DispatchXULCommand(nsIContent* aTarget,
                                     bool aTrusted,
                                     nsIDOMEvent* aSourceEvent = nullptr,
                                     nsIPresShell* aShell = nullptr,
                                     bool aCtrl = false,
                                     bool aAlt = false,
                                     bool aShift = false,
                                     bool aMeta = false);

  static bool CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, bool aAllowIfInheritsPrincipal);

  /**
   * The method checks whether the caller can access native anonymous content.
   * If there is no JS in the stack or privileged JS is running, this
   * method returns true, otherwise false.
   */
  static bool CanAccessNativeAnon();

  MOZ_MUST_USE
  static nsresult WrapNative(JSContext *cx, nsISupports *native,
                             const nsIID* aIID, JS::MutableHandle<JS::Value> vp,
                             bool aAllowWrapping = true)
  {
    return WrapNative(cx, native, nullptr, aIID, vp, aAllowWrapping);
  }

  // Same as the WrapNative above, but use this one if aIID is nsISupports' IID.
  MOZ_MUST_USE
  static nsresult WrapNative(JSContext *cx, nsISupports *native,
                             JS::MutableHandle<JS::Value> vp,
                             bool aAllowWrapping = true)
  {
    return WrapNative(cx, native, nullptr, nullptr, vp, aAllowWrapping);
  }

  MOZ_MUST_USE
  static nsresult WrapNative(JSContext *cx, nsISupports *native,
                             nsWrapperCache *cache,
                             JS::MutableHandle<JS::Value> vp,
                             bool aAllowWrapping = true)
  {
    return WrapNative(cx, native, cache, nullptr, vp, aAllowWrapping);
  }

  /**
   * Creates an arraybuffer from a binary string.
   */
  static nsresult CreateArrayBuffer(JSContext *aCx, const nsACString& aData,
                                    JSObject** aResult);

  static void StripNullChars(const nsAString& aInStr, nsAString& aOutStr);

  /**
   * Strip all \n, \r and nulls from the given string
   * @param aString the string to remove newlines from [in/out]
   */
  static void RemoveNewlines(nsString &aString);

  /**
   * Convert Windows and Mac platform linebreaks to \n.
   * @param aString the string to convert the newlines inside [in/out]
   */
  static void PlatformToDOMLineBreaks(nsString &aString);
  MOZ_MUST_USE
  static bool PlatformToDOMLineBreaks(nsString &aString,
                                      const mozilla::fallible_t&);

  /**
   * Populates aResultString with the contents of the string-buffer aBuf, up
   * to aBuf's null-terminator.  aBuf must not be null. Ownership of the string
   * is not transferred.
   */
  static void PopulateStringFromStringBuffer(nsStringBuffer* aBuf,
                                             nsAString& aResultString);

  static bool IsHandlingKeyBoardEvent()
  {
    return sIsHandlingKeyBoardEvent;
  }

  static void SetIsHandlingKeyBoardEvent(bool aHandling)
  {
    sIsHandlingKeyBoardEvent = aHandling;
  }

  /**
   * Utility method for getElementsByClassName.  aRootNode is the node (either
   * document or element), which getElementsByClassName was called on.
   */
  static already_AddRefed<nsContentList>
  GetElementsByClassName(nsINode* aRootNode, const nsAString& aClasses)
  {
    NS_PRECONDITION(aRootNode, "Must have root node");

    return NS_GetFuncStringHTMLCollection(aRootNode, MatchClassNames,
                                          DestroyClassNameArray,
                                          AllocClassMatchingInfo,
                                          aClasses);
  }

  /**
   * Returns a presshell for this document, if there is one. This will be
   * aDoc's direct presshell if there is one, otherwise we'll look at all
   * ancestor documents to try to find a presshell, so for example this can
   * still find a presshell for documents in display:none frames that have
   * no presentation. So you have to be careful how you use this presshell ---
   * getting generic data like a device context or widget from it is OK, but it
   * might not be this document's actual presentation.
   */
  static nsIPresShell* FindPresShellForDocument(const nsIDocument* aDoc);

  /**
   * Returns the widget for this document if there is one. Looks at all ancestor
   * documents to try to find a widget, so for example this can still find a
   * widget for documents in display:none frames that have no presentation.
   */
  static nsIWidget* WidgetForDocument(const nsIDocument* aDoc);

  /**
   * Returns a layer manager to use for the given document. Basically we
   * look up the document hierarchy for the first document which has
   * a presentation with an associated widget, and use that widget's
   * layer manager.
   *
   * @param aDoc the document for which to return a layer manager.
   * @param aAllowRetaining an outparam that states whether the returned
   * layer manager should be used for retained layers
   */
  static already_AddRefed<mozilla::layers::LayerManager>
  LayerManagerForDocument(const nsIDocument *aDoc);

  /**
   * Returns a layer manager to use for the given document. Basically we
   * look up the document hierarchy for the first document which has
   * a presentation with an associated widget, and use that widget's
   * layer manager. In addition to the normal layer manager lookup this will
   * specifically request a persistent layer manager. This means that the layer
   * manager is expected to remain the layer manager for the document in the
   * forseeable future. This function should be used carefully as it may change
   * the document's layer manager.
   *
   * @param aDoc the document for which to return a layer manager.
   * @param aAllowRetaining an outparam that states whether the returned
   * layer manager should be used for retained layers
   */
  static already_AddRefed<mozilla::layers::LayerManager>
  PersistentLayerManagerForDocument(nsIDocument *aDoc);

  /**
   * Determine whether a content node is focused or not,
   *
   * @param aContent the content node to check
   * @return true if the content node is focused, false otherwise.
   */
  static bool IsFocusedContent(const nsIContent *aContent);

  /**
   * Returns true if the DOM full-screen API is enabled.
   */
  static bool IsFullScreenApiEnabled();

  /**
   * Returns true if the unprefixed fullscreen API is enabled.
   */
  static bool IsUnprefixedFullscreenApiEnabled()
    { return sIsUnprefixedFullscreenApiEnabled; }

  /**
   * Returns true if requests for full-screen are allowed in the current
   * context. Requests are only allowed if the user initiated them (like with
   * a mouse-click or key press), unless this check has been disabled by
   * setting the pref "full-screen-api.allow-trusted-requests-only" to false.
   */
  static bool IsRequestFullScreenAllowed();

  /**
   * Returns true if calling execCommand with 'cut' or 'copy' arguments
   * is restricted to chrome code.
   */
  static bool IsCutCopyRestricted()
  {
    return !sIsCutCopyAllowed;
  }

  /**
   * Returns true if calling execCommand with 'cut' or 'copy' arguments is
   * allowed in the current context. These are only allowed if the user initiated
   * them (like with a mouse-click or key press).
   */
  static bool IsCutCopyAllowed();

  /*
   * Returns true if the performance timing APIs are enabled.
   */
  static bool IsPerformanceTimingEnabled()
  {
    return sIsPerformanceTimingEnabled;
  }

  /*
   * Returns true if user timing API should print to console.
   */
  static bool IsUserTimingLoggingEnabled()
  {
    return sIsUserTimingLoggingEnabled;
  }

  /*
   * Returns true if the performance timing APIs are enabled.
   */
  static bool IsResourceTimingEnabled()
  {
    return sIsResourceTimingEnabled;
  }

  /*
   * Returns true if the performance timing APIs are enabled.
   */
  static bool IsPerformanceNavigationTimingEnabled()
  {
    return sIsPerformanceNavigationTimingEnabled;
  }

  /*
   * Returns true if notification should be sent for peformance timing events.
   */
  static bool SendPerformanceTimingNotifications()
  {
    return sSendPerformanceTimingNotifications;
  }

  /*
   * Returns true if the frame timing APIs are enabled.
   */
  static bool IsFrameTimingEnabled();

  /*
   * Returns true if URL setters should percent encode the Hash/Ref segment
   * and getters should return the percent decoded value of the segment
   */
  static bool EncodeDecodeURLHash()
  {
    return sEncodeDecodeURLHash;
  }

  /*
   * Returns true if URL getters should percent decode the value of the segment
   */
  static bool GettersDecodeURLHash()
  {
    return sGettersDecodeURLHash && sEncodeDecodeURLHash;
  }

  /*
   * Returns true if the browser should attempt to prevent content scripts
   * from collecting distinctive information about the browser that could
   * be used to "fingerprint" and track the user across websites.
   */
  static bool ResistFingerprinting()
  {
    return sPrivacyResistFingerprinting;
  }

  /*
   * Returns true if the browser should attempt to prevent the given caller type
   * from collecting distinctive information about the browser that could
   * be used to "fingerprint" and track the user across websites.
   */
  static bool ResistFingerprinting(mozilla::dom::CallerType aCallerType)
  {
    return aCallerType != mozilla::dom::CallerType::System &&
           ResistFingerprinting();
  }

  /**
   * Returns true if the browser should show busy cursor when loading page.
   */
  static bool UseActivityCursor()
  {
    return sUseActivityCursor;
  }

  /**
   * Return true if this doc is controlled by a ServiceWorker.
   */
  static bool IsControlledByServiceWorker(nsIDocument* aDocument);

  /**
   * Fire mutation events for changes caused by parsing directly into a
   * context node.
   *
   * @param aDoc the document of the node
   * @param aDest the destination node that got stuff appended to it
   * @param aOldChildCount the number of children the node had before parsing
   */
  static void FireMutationEventsForDirectParsing(nsIDocument* aDoc,
                                                 nsIContent* aDest,
                                                 int32_t aOldChildCount);

  /**
   * Returns true if the content is in a document and contains a plugin
   * which we don't control event dispatch for, i.e. do any plugins in this
   * doc tree receive key events outside of our control? This always returns
   * false on MacOSX.
   */
  static bool HasPluginWithUncontrolledEventDispatch(nsIContent* aContent);

  /**
   * Returns the root document in a document hierarchy. Normally this
   * will be the chrome document.
   */
  static nsIDocument* GetRootDocument(nsIDocument* aDoc);

  /**
   * Returns true if aWin and the current pointer lock document
   * have common scriptable top window.
   */
  static bool IsInPointerLockContext(nsPIDOMWindowOuter* aWin);

  /**
   * Returns the time limit on handling user input before
   * EventStateManager::IsHandlingUserInput() stops returning true.
   * This enables us to detect long running user-generated event handlers.
   */
  static TimeDuration HandlingUserInputTimeout();

  static void GetShiftText(nsAString& text);
  static void GetControlText(nsAString& text);
  static void GetMetaText(nsAString& text);
  static void GetOSText(nsAString& text);
  static void GetAltText(nsAString& text);
  static void GetModifierSeparatorText(nsAString& text);

  /**
   * Returns if aContent has a tabbable subdocument.
   * A sub document isn't tabbable when it's a zombie document.
   *
   * @param aElement element to test.
   *
   * @return Whether the subdocument is tabbable.
   */
  static bool IsSubDocumentTabbable(nsIContent* aContent);

  /**
   * Returns if aNode ignores user focus.
   *
   * @param aNode node to test
   *
   * @return Whether the node ignores user focus.
   */
  static bool IsUserFocusIgnored(nsINode* aNode);

  /**
   * Returns if aContent has the 'scrollgrab' property.
   * aContent may be null (in this case false is returned).
   */
  static bool HasScrollgrab(nsIContent* aContent);

  /**
   * Flushes the layout tree (recursively)
   *
   * @param aWindow the window the flush should start at
   *
   */
  static void FlushLayoutForTree(nsPIDOMWindowOuter* aWindow);

  /**
   * Returns true if content with the given principal is allowed to use XUL
   * and XBL and false otherwise.
   */
  static bool AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal);

  /**
   * Perform cleanup that's appropriate for XPCOM shutdown.
   */
  static void XPCOMShutdown();

  /**
   * Checks if internal PDF viewer is enabled.
   */
  static bool IsPDFJSEnabled();

  /**
   * Checks if internal SWF player is enabled.
   */
  static bool IsSWFPlayerEnabled();

  enum ContentViewerType
  {
      TYPE_UNSUPPORTED,
      TYPE_CONTENT,
      TYPE_PLUGIN,
      TYPE_UNKNOWN
  };

  static already_AddRefed<nsIDocumentLoaderFactory>
  FindInternalContentViewer(const nsACString& aType,
                            ContentViewerType* aLoaderType = nullptr);

  /**
   * This helper method returns true if the aPattern pattern matches aValue.
   * aPattern should not contain leading and trailing slashes (/).
   * The pattern has to match the entire value not just a subset.
   * aDocument must be a valid pointer (not null).
   *
   * This is following the HTML5 specification:
   * http://dev.w3.org/html5/spec/forms.html#attr-input-pattern
   *
   * WARNING: This method mutates aPattern and aValue!
   *
   * @param aValue    the string to check.
   * @param aPattern  the string defining the pattern.
   * @param aDocument the owner document of the element.
   * @result          whether the given string is matches the pattern.
   */
  static bool IsPatternMatching(nsAString& aValue, nsAString& aPattern,
                                  nsIDocument* aDocument);

  /**
   * Calling this adds support for
   * ontouch* event handler DOM attributes.
   */
  static void InitializeTouchEventTable();

  /**
   * Test whether the given URI always inherits a security context
   * from the document it comes from.
   */
  static nsresult URIInheritsSecurityContext(nsIURI *aURI, bool *aResult);

  /**
    * Called before a channel is created to query whether the new
    * channel should inherit the principal.
    *
    * The argument aLoadingPrincipal must not be null. The argument
    * aURI must be the URI of the new channel. If aInheritForAboutBlank
    * is true, then about:blank will be told to inherit the principal.
    * If aForceInherit is true, the new channel will be told to inherit
    * the principal no matter what.
    *
    * The return value is whether the new channel should inherit
    * the principal.
    */
  static bool ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal,
                                            nsIURI* aURI,
                                            bool aInheritForAboutBlank,
                                            bool aForceInherit);

  static nsresult Btoa(const nsAString& aBinaryData,
                       nsAString& aAsciiBase64String);

  static nsresult Atob(const nsAString& aAsciiString,
                       nsAString& aBinaryData);

  /**
   * Returns whether the input element passed in parameter has the autocomplete
   * functionality enabled. It is taking into account the form owner.
   * NOTE: the caller has to make sure autocomplete makes sense for the
   * element's type.
   *
   * @param aInput the input element to check. NOTE: aInput can't be null.
   * @return whether the input element has autocomplete enabled.
   */
  static bool IsAutocompleteEnabled(nsIDOMHTMLInputElement* aInput);

  enum AutocompleteAttrState : uint8_t
  {
    eAutocompleteAttrState_Unknown = 1,
    eAutocompleteAttrState_Invalid,
    eAutocompleteAttrState_Valid,
  };
  /**
   * Parses the value of the autocomplete attribute into aResult, ensuring it's
   * composed of valid tokens, otherwise the value "" is used.
   * Note that this method is used for form fields, not on a <form> itself.
   *
   * @return whether aAttr was valid and can be cached.
   */
  static AutocompleteAttrState
  SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
                                 nsAString& aResult,
                                 AutocompleteAttrState aCachedState =
                                   eAutocompleteAttrState_Unknown);

  /* Variation that is used to retrieve a dictionary of the parts of the
   * autocomplete attribute.
   *
   * @return whether aAttr was valid and can be cached.
   */
  static AutocompleteAttrState
  SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
                                 mozilla::dom::AutocompleteInfo& aInfo,
                                 AutocompleteAttrState aCachedState =
                                   eAutocompleteAttrState_Unknown);

  /**
   * This will parse aSource, to extract the value of the pseudo attribute
   * with the name specified in aName. See
   * http://www.w3.org/TR/xml-stylesheet/#NT-StyleSheetPI for the specification
   * which is used to parse aSource.
   *
   * @param aSource the string to parse
   * @param aName the name of the attribute to get the value for
   * @param aValue [out] the value for the attribute with name specified in
   *                     aAttribute. Empty if the attribute isn't present.
   * @return true     if the attribute exists and was successfully parsed.
   *         false if the attribute doesn't exist, or has a malformed
   *                  value, such as an unknown or unterminated entity.
   */
  static bool GetPseudoAttributeValue(const nsString& aSource, nsIAtom *aName,
                                      nsAString& aValue);

  /**
   * Returns true if the language name is a version of JavaScript and
   * false otherwise
   */
  static bool IsJavaScriptLanguage(const nsString& aName);

  /**
   * Returns the JSVersion for a string of the form '1.n', n = 0, ..., 8, and
   * JSVERSION_UNKNOWN for other strings.
   */
  static JSVersion ParseJavascriptVersion(const nsAString& aVersionStr);

  static bool IsJavascriptMIMEType(const nsAString& aMIMEType);

  static void SplitMimeType(const nsAString& aValue, nsString& aType,
                            nsString& aParams);

  /**
   * Function checks if the user is idle.
   *
   * @param aRequestedIdleTimeInMS    The idle observer's requested idle time.
   * @param aUserIsIdle               boolean indicating if the user
   *                                  is currently idle or not.   *
   * @return NS_OK                    NS_OK returned if the requested idle service and
   *                                  the current idle time were successfully obtained.
   *                                  NS_ERROR_FAILURE returned if the the requested
   *                                  idle service or the current idle were not obtained.
   */
  static nsresult IsUserIdle(uint32_t aRequestedIdleTimeInMS, bool* aUserIsIdle);

  /**
   * Takes a selection, and a text control element (<input> or <textarea>), and
   * returns the offsets in the text content corresponding to the selection.
   * The selection's anchor and focus must both be in the root node passed or a
   * descendant.
   *
   * @param aSelection      Selection to check
   * @param aRoot           Root <input> or <textarea> element
   * @param aOutStartOffset Output start offset
   * @param aOutEndOffset   Output end offset
   */
  static void GetSelectionInTextControl(mozilla::dom::Selection* aSelection,
                                        Element* aRoot,
                                        int32_t& aOutStartOffset,
                                        int32_t& aOutEndOffset);

  /**
   * Takes a frame for anonymous content within a text control (<input> or
   * <textarea>), and returns an offset in the text content, adjusted for a
   * trailing <br> frame.
   *
   * @param aOffsetFrame      Frame for the text content in which the offset
   *                          lies
   * @param aOffset           Offset as calculated by GetContentOffsetsFromPoint
   * @param aOutOffset        Output adjusted offset
   *
   * @see GetSelectionInTextControl for the original basis of this function.
   */
  static int32_t GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame,
                                                int32_t aOffset);

  static nsIEditor* GetHTMLEditor(nsPresContext* aPresContext);

  /**
   * Returns true if the browser.dom.window.dump.enabled pref is set.
   */
  static bool DOMWindowDumpEnabled();

  /**
   * Returns true if the privacy.donottrackheader.enabled pref is set.
   */
  static bool DoNotTrackEnabled();

  /**
   * Returns a LogModule that dump calls from content script are logged to.
   * This can be enabled with the 'Dump' module, and is useful for synchronizing
   * content JS to other logging modules.
   */
  static mozilla::LogModule* DOMDumpLog();

  /**
   * Returns whether a content is an insertion point for XBL
   * bindings or web components ShadowRoot. In web components,
   * this corresponds to a <content> element that participates
   * in node distribution. In XBL this corresponds to an
   * <xbl:children> element in anonymous content.
   *
   * @param aContent The content to test for being an insertion point.
   */
  static bool IsContentInsertionPoint(nsIContent* aContent);


  /**
   * Returns whether the children of the provided content are
   * nodes that are distributed to Shadow DOM insertion points.
   */
  static bool HasDistributedChildren(nsIContent* aContent);

  /**
   * Returns whether a given header is forbidden for an XHR or fetch
   * request.
   */
  static bool IsForbiddenRequestHeader(const nsACString& aHeader);

  /**
   * Returns whether a given header is forbidden for a system XHR
   * request.
   */
  static bool IsForbiddenSystemRequestHeader(const nsACString& aHeader);

  /**
   * Returns whether a given Content-Type header value is allowed
   * for a non-CORS XHR or fetch request.
   */
  static bool IsAllowedNonCorsContentType(const nsACString& aHeaderValue);

  /**
   * Returns whether a given header is forbidden for an XHR or fetch
   * response.
   */
  static bool IsForbiddenResponseHeader(const nsACString& aHeader);

  /**
   * Returns the inner window ID for the window associated with a request,
   */
  static uint64_t GetInnerWindowID(nsIRequest* aRequest);

  /**
   * If the hostname for aURI is an IPv6 it encloses it in brackets,
   * otherwise it just outputs the hostname in aHost.
   */
  static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost);
  static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsCString& aHost);

  /*
   * Call the given callback on all remote children of the given top-level
   * window. Return true from the callback to stop calling further children.
   */
  static void CallOnAllRemoteChildren(nsPIDOMWindowOuter* aWindow,
                                      CallOnRemoteChildFunction aCallback,
                                      void* aArg);

  /*
   * Call nsPIDOMWindow::SetKeyboardIndicators all all remote children. This is
   * in here rather than nsGlobalWindow because TabParent indirectly includes
   * Windows headers which aren't allowed there.
   */
  static void SetKeyboardIndicatorsOnRemoteChildren(nsPIDOMWindowOuter* aWindow,
                                                    UIStateChangeType aShowAccelerators,
                                                    UIStateChangeType aShowFocusRings);

  /**
   * Given an nsIFile, attempts to read it into aString.
   *
   * Note: Use sparingly! This causes main-thread I/O, which causes jank and all
   * other bad things.
   */
  static nsresult SlurpFileToString(nsIFile* aFile, nsACString& aString);

  /**
   * Returns true if the mime service thinks this file contains an image.
   *
   * The content type is returned in aType.
   */
  static bool IsFileImage(nsIFile* aFile, nsACString& aType);

  /**
   * Given an IPCDataTransferItem that has a flavor for which IsFlavorImage
   * returns true and whose IPCDataTransferData is of type nsCString (raw image
   * data), construct an imgIContainer for the image encoded by the transfer
   * item.
   */
  static nsresult DataTransferItemToImage(const mozilla::dom::IPCDataTransferItem& aItem,
                                          imgIContainer** aContainer);

  /**
   * Given a flavor obtained from an IPCDataTransferItem or nsITransferable,
   * returns true if we should treat the data as an image.
   */
  static bool IsFlavorImage(const nsACString& aFlavor);

  static nsresult IPCTransferableToTransferable(const mozilla::dom::IPCDataTransfer& aDataTransfer,
                                                const bool& aIsPrivateData,
                                                nsIPrincipal* aRequestingPrincipal,
                                                nsITransferable* aTransferable,
                                                mozilla::dom::nsIContentParent* aContentParent,
                                                mozilla::dom::TabChild* aTabChild);

  static void TransferablesToIPCTransferables(nsIArray* aTransferables,
                                              nsTArray<mozilla::dom::IPCDataTransfer>& aIPC,
                                              bool aInSyncMessage,
                                              mozilla::dom::nsIContentChild* aChild,
                                              mozilla::dom::nsIContentParent* aParent);

  static void TransferableToIPCTransferable(nsITransferable* aTransferable,
                                            mozilla::dom::IPCDataTransfer* aIPCDataTransfer,
                                            bool aInSyncMessage,
                                            mozilla::dom::nsIContentChild* aChild,
                                            mozilla::dom::nsIContentParent* aParent);

  /*
   * Get the pixel data from the given source surface and return it as a buffer.
   * The length and stride will be assigned from the surface.
   */
  static mozilla::UniquePtr<char[]> GetSurfaceData(
    mozilla::NotNull<mozilla::gfx::DataSourceSurface*> aSurface,
    size_t* aLength, int32_t* aStride);

  /*
   * Get the pixel data from the given source surface and fill it in Shmem.
   * The length and stride will be assigned from the surface.
   */
  static void GetSurfaceData(mozilla::gfx::DataSourceSurface* aSurface,
                             size_t* aLength, int32_t* aStride,
                             mozilla::ipc::IShmemAllocator* aAlloc,
                             mozilla::ipc::Shmem *aOutShmem);

  // Helpers shared by the implementations of nsContentUtils methods and
  // nsIDOMWindowUtils methods.
  static mozilla::Modifiers GetWidgetModifiers(int32_t aModifiers);
  static nsIWidget* GetWidget(nsIPresShell* aPresShell, nsPoint* aOffset);
  static int16_t GetButtonsFlagForButton(int32_t aButton);
  static mozilla::LayoutDeviceIntPoint ToWidgetPoint(const mozilla::CSSPoint& aPoint,
                                                     const nsPoint& aOffset,
                                                     nsPresContext* aPresContext);
  static nsView* GetViewToDispatchEvent(nsPresContext* aPresContext,
                                        nsIPresShell** aPresShell);

  /**
   * Synthesize a key event to the given widget
   * (see nsIDOMWindowUtils.sendKeyEvent).
   */
  static nsresult SendKeyEvent(nsIWidget* aWidget,
                               const nsAString& aType,
                               int32_t aKeyCode,
                               int32_t aCharCode,
                               int32_t aModifiers,
                               uint32_t aAdditionalFlags,
                               bool* aDefaultActionTaken);

  /**
   * Synthesize a mouse event to the given widget
   * (see nsIDOMWindowUtils.sendMouseEvent).
   */
  static nsresult SendMouseEvent(nsCOMPtr<nsIPresShell> aPresShell,
                                 const nsAString& aType,
                                 float aX,
                                 float aY,
                                 int32_t aButton,
                                 int32_t aButtons,
                                 int32_t aClickCount,
                                 int32_t aModifiers,
                                 bool aIgnoreRootScrollFrame,
                                 float aPressure,
                                 unsigned short aInputSourceArg,
                                 bool aToWindow,
                                 bool *aPreventDefault,
                                 bool aIsDOMEventSynthesized,
                                 bool aIsWidgetEventSynthesized);

  static void FirePageShowEvent(nsIDocShellTreeItem* aItem,
                                mozilla::dom::EventTarget* aChromeEventHandler,
                                bool aFireIfShowing);

  static void FirePageHideEvent(nsIDocShellTreeItem* aItem,
                                mozilla::dom::EventTarget* aChromeEventHandler);

  static already_AddRefed<nsPIWindowRoot> GetWindowRoot(nsIDocument* aDoc);

  /*
   * Implements step 3.1 and 3.3 of the Determine request's Referrer algorithm
   * from the Referrer Policy specification.
   *
   * The referrer policy of the document is applied by Necko when using
   * channels.
   *
   * For documents representing an iframe srcdoc attribute, the document sets
   * its own URI correctly, so this method simply uses the document's original
   * or current URI as appropriate.
   *
   * aDoc may be null.
   *
   * https://w3c.github.io/webappsec/specs/referrer-policy/#determine-requests-referrer
   */
  static nsresult SetFetchReferrerURIWithPolicy(nsIPrincipal* aPrincipal,
                                                nsIDocument* aDoc,
                                                nsIHttpChannel* aChannel,
                                                mozilla::net::ReferrerPolicy aReferrerPolicy);

    /*
   * Parse a referrer policy from a Referrer-Policy header
   * https://www.w3.org/TR/referrer-policy/#parse-referrer-policy-from-header
   *
   * @param aHeader the response's Referrer-Policy header to parse
   * @return referrer policy from the response header.
   */
  static mozilla::net::ReferrerPolicy GetReferrerPolicyFromHeader(const nsAString& aHeader);

  static bool PushEnabled(JSContext* aCx, JSObject* aObj);

  static bool IsNonSubresourceRequest(nsIChannel* aChannel);

  static uint32_t CookiesBehavior()
  {
    return sCookiesBehavior;
  }

  // The order of these entries matters, as we use std::min for total ordering
  // of permissions. Private Browsing is considered to be more limiting
  // then session scoping
  enum class StorageAccess {
    // Don't allow access to the storage
    eDeny = 0,
    // Allow access to the storage, but only if it is secure to do so in a
    // private browsing context.
    ePrivateBrowsing = 1,
    // Allow access to the storage, but only persist it for the current session
    eSessionScoped = 2,
    // Allow access to the storage
    eAllow = 3,
  };

  /*
   * Checks if storage for the given window is permitted by a combination of
   * the user's preferences, and whether the window is a third-party iframe.
   *
   * This logic is intended to be shared between the different forms of
   * persistent storage which are available to web pages. Cookies don't use
   * this logic, and security logic related to them must be updated separately.
   */
  static StorageAccess StorageAllowedForWindow(nsPIDOMWindowInner* aWindow);

  /*
   * Checks if storage for the given principal is permitted by the user's
   * preferences. The caller is assumed to not be a third-party iframe.
   * (if that is possible, the caller should use StorageAllowedForWindow)
   */
  static StorageAccess StorageAllowedForPrincipal(nsIPrincipal* aPrincipal);

  /*
   * Serializes a HTML nsINode into its markup representation.
   */
  static bool SerializeNodeToMarkup(nsINode* aRoot,
                                    bool aDescendentsOnly,
                                    nsAString& aOut);

  /*
   * Returns true iff the provided JSObject is a global, and its URI matches
   * the provided about: URI.
   * @param aGlobal the JSObject whose URI to check, if it is a global.
   * @param aUri the URI to match, e.g. "about:feeds"
   */
  static bool IsSpecificAboutPage(JSObject* aGlobal, const char* aUri);

  static void SetScrollbarsVisibility(nsIDocShell* aDocShell, bool aVisible);

  /*
   * Return the associated presentation URL of the presented content.
   * Will return empty string if the docshell is not in a presented content.
   */
  static void GetPresentationURL(nsIDocShell* aDocShell, nsAString& aPresentationUrl);

  /*
   * Try to find the docshell corresponding to the given event target.
   */
  static nsIDocShell* GetDocShellForEventTarget(mozilla::dom::EventTarget* aTarget);

  /**
   * Returns true if the "HTTPS state" of the document should be "modern". See:
   *
   * https://html.spec.whatwg.org/#concept-document-https-state
   * https://fetch.spec.whatwg.org/#concept-response-https-state
   */
  static bool HttpsStateIsModern(nsIDocument* aDocument);

  /**
   * Try to upgrade an element.
   * https://html.spec.whatwg.org/multipage/custom-elements.html#concept-try-upgrade
   */
  static void TryToUpgradeElement(Element* aElement);

  /**
   * Looking up a custom element definition.
   * https://html.spec.whatwg.org/#look-up-a-custom-element-definition
   */
  static mozilla::dom::CustomElementDefinition*
    LookupCustomElementDefinition(nsIDocument* aDoc,
                                  nsIAtom* aNameAtom,
                                  uint32_t aNameSpaceID,
                                  nsIAtom* aTypeAtom);

  static void RegisterUnresolvedElement(Element* aElement, nsIAtom* aTypeName);
  static void UnregisterUnresolvedElement(Element* aElement);

  static mozilla::dom::CustomElementDefinition*
  GetElementDefinitionIfObservingAttr(Element* aCustomElement,
                                      nsIAtom* aExtensionType,
                                      nsIAtom* aAttrName);

  static void EnqueueUpgradeReaction(Element* aElement,
                                     mozilla::dom::CustomElementDefinition* aDefinition);

  static void EnqueueLifecycleCallback(nsIDocument::ElementCallbackType aType,
                                       Element* aCustomElement,
                                       mozilla::dom::LifecycleCallbackArgs* aArgs = nullptr,
                                       mozilla::dom::LifecycleAdoptedCallbackArgs* aAdoptedCallbackArgs = nullptr,
                                       mozilla::dom::CustomElementDefinition* aDefinition = nullptr);

  static void GetCustomPrototype(nsIDocument* aDoc,
                                 int32_t aNamespaceID,
                                 nsIAtom* aAtom,
                                 JS::MutableHandle<JSObject*> prototype);

  static bool AttemptLargeAllocationLoad(nsIHttpChannel* aChannel);

  /**
   * Appends all "document level" native anonymous content subtree roots for
   * aDocument to aElements.  Document level NAC subtrees are those created
   * by ancestor frames of the document element's primary frame, such as
   * the scrollbar elements created by the root scroll frame.
   */
  static void AppendDocumentLevelNativeAnonymousContentTo(
      nsIDocument* aDocument,
      nsTArray<nsIContent*>& aElements);

  /**
   * Detect whether a string is a (CSS) local-url.
   * https://drafts.csswg.org/css-values/#local-urls
   */
  static bool
  IsLocalRefURL(const nsString& aString);

  static bool
  IsWebComponentsEnabled() { return sIsWebComponentsEnabled; }

  /**
   * Walks up the tree from aElement until it finds an element that is
   * not native anonymous content.  aElement must be NAC itself.
   */
  static Element* GetClosestNonNativeAnonymousAncestor(Element* aElement);

  static bool
  IsCustomElementsEnabled() { return sIsCustomElementsEnabled; }

private:
  static bool InitializeEventTable();

  static nsresult EnsureStringBundle(PropertiesFile aFile);

  static bool CanCallerAccess(nsIPrincipal* aSubjectPrincipal,
                                nsIPrincipal* aPrincipal);

  static nsresult WrapNative(JSContext *cx, nsISupports *native,
                             nsWrapperCache *cache, const nsIID* aIID,
                             JS::MutableHandle<JS::Value> vp,
                             bool aAllowWrapping);

  static nsresult DispatchEvent(nsIDocument* aDoc,
                                nsISupports* aTarget,
                                const nsAString& aEventName,
                                bool aCanBubble,
                                bool aCancelable,
                                bool aTrusted,
                                bool *aDefaultAction = nullptr,
                                bool aOnlyChromeDispatch = false);

  static void InitializeModifierStrings();

  static void DropFragmentParsers();

  static bool MatchClassNames(mozilla::dom::Element* aElement,
                              int32_t aNamespaceID,
                              nsIAtom* aAtom, void* aData);
  static void DestroyClassNameArray(void* aData);
  static void* AllocClassMatchingInfo(nsINode* aRootNode,
                                      const nsString* aClasses);

  // Fills in aInfo with the tokens from the supplied autocomplete attribute.
  static AutocompleteAttrState InternalSerializeAutocompleteAttribute(const nsAttrValue* aAttrVal,
                                                                      mozilla::dom::AutocompleteInfo& aInfo);

  static bool CallOnAllRemoteChildren(nsIMessageBroadcaster* aManager,
                                      CallOnRemoteChildFunction aCallback,
                                      void* aArg);

  /*
   * Checks if storage for a given principal is permitted by the user's
   * preferences. If aWindow is non-null, its principal must be passed as
   * aPrincipal, and the third-party iframe and sandboxing status of the window
   * are also checked.
   *
   * Used in the implementation of StorageAllowedForWindow and
   * StorageAllowedForPrincipal.
   */
  static StorageAccess InternalStorageAllowedForPrincipal(nsIPrincipal* aPrincipal,
                                                          nsPIDOMWindowInner* aWindow);

  static nsIXPConnect *sXPConnect;

  static nsIScriptSecurityManager *sSecurityManager;
  static nsIPrincipal *sSystemPrincipal;
  static nsIPrincipal *sNullSubjectPrincipal;

  static nsIParserService *sParserService;

  static nsNameSpaceManager *sNameSpaceManager;

  static nsIIOService *sIOService;
  static nsIUUIDGenerator *sUUIDGenerator;

  static nsIConsoleService* sConsoleService;

  static nsDataHashtable<nsISupportsHashKey, EventNameMapping>* sAtomEventTable;
  static nsDataHashtable<nsStringHashKey, EventNameMapping>* sStringEventTable;
  static nsCOMArray<nsIAtom>* sUserDefinedEvents;

  static nsIStringBundleService* sStringBundleService;
  static nsIStringBundle* sStringBundles[PropertiesFile_COUNT];

  static nsIContentPolicy* sContentPolicyService;
  static bool sTriedToGetContentPolicy;

  static nsILineBreaker* sLineBreaker;
  static nsIWordBreaker* sWordBreaker;

  static nsIBidiKeyboard* sBidiKeyboard;

  static bool sInitialized;
  static uint32_t sScriptBlockerCount;
  static uint32_t sDOMNodeRemovedSuppressCount;
  // Not an nsCOMArray because removing elements from those is slower
  static AutoTArray<nsCOMPtr<nsIRunnable>, 8>* sBlockedScriptRunners;
  static uint32_t sRunnersCountAtFirstBlocker;
  static uint32_t sScriptBlockerCountWhereRunnersPrevented;

  static nsIInterfaceRequestor* sSameOriginChecker;

  static bool sIsHandlingKeyBoardEvent;
  static bool sAllowXULXBL_for_file;
  static bool sIsFullScreenApiEnabled;
  static bool sIsUnprefixedFullscreenApiEnabled;
  static bool sTrustedFullScreenOnly;
  static bool sIsCutCopyAllowed;
  static uint32_t sHandlingInputTimeout;
  static bool sIsPerformanceTimingEnabled;
  static bool sIsResourceTimingEnabled;
  static bool sIsPerformanceNavigationTimingEnabled;
  static bool sIsUserTimingLoggingEnabled;
  static bool sIsFrameTimingPrefEnabled;
  static bool sIsExperimentalAutocompleteEnabled;
  static bool sIsWebComponentsEnabled;
  static bool sIsCustomElementsEnabled;
  static bool sEncodeDecodeURLHash;
  static bool sGettersDecodeURLHash;
  static bool sPrivacyResistFingerprinting;
  static bool sSendPerformanceTimingNotifications;
  static bool sUseActivityCursor;
  static uint32_t sCookiesLifetimePolicy;
  static uint32_t sCookiesBehavior;

  static nsHtml5StringParser* sHTMLFragmentParser;
  static nsIParser* sXMLFragmentParser;
  static nsIFragmentContentSink* sXMLFragmentSink;

  /**
   * True if there's a fragment parser activation on the stack.
   */
  static bool sFragmentParsingActive;

  static nsString* sShiftText;
  static nsString* sControlText;
  static nsString* sMetaText;
  static nsString* sOSText;
  static nsString* sAltText;
  static nsString* sModifierSeparator;

#if !(defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP))
  static bool sDOMWindowDumpEnabled;
#endif
  static bool sDoNotTrackEnabled;
  static mozilla::LazyLogModule sDOMDumpLog;
};

class MOZ_RAII nsAutoScriptBlocker {
public:
  explicit nsAutoScriptBlocker(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM) {
    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    nsContentUtils::AddScriptBlocker();
  }
  ~nsAutoScriptBlocker() {
    nsContentUtils::RemoveScriptBlocker();
  }
private:
  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

class MOZ_STACK_CLASS nsAutoScriptBlockerSuppressNodeRemoved :
                          public nsAutoScriptBlocker {
public:
  nsAutoScriptBlockerSuppressNodeRemoved() {
    ++nsContentUtils::sDOMNodeRemovedSuppressCount;
  }
  ~nsAutoScriptBlockerSuppressNodeRemoved() {
    --nsContentUtils::sDOMNodeRemovedSuppressCount;
  }
};

namespace mozilla {
namespace dom {

class TreeOrderComparator {
public:
  bool Equals(nsINode* aElem1, nsINode* aElem2) const {
    return aElem1 == aElem2;
  }
  bool LessThan(nsINode* aElem1, nsINode* aElem2) const {
    return nsContentUtils::PositionIsBefore(aElem1, aElem2);
  }
};

} // namespace dom
} // namespace mozilla

#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator)                \
  if (aIID.Equals(NS_GET_IID(_interface))) {                                  \
    foundInterface = static_cast<_interface *>(_allocator);                   \
    if (!foundInterface) {                                                    \
      *aInstancePtr = nullptr;                                                \
      return NS_ERROR_OUT_OF_MEMORY;                                          \
    }                                                                         \
  } else

/*
 * In the following helper macros we exploit the fact that the result of a
 * series of additions will not be finite if any one of the operands in the
 * series is not finite.
 */
#define NS_ENSURE_FINITE(f, rv)                                               \
  if (!mozilla::IsFinite(f)) {                                                \
    return (rv);                                                              \
  }

#define NS_ENSURE_FINITE2(f1, f2, rv)                                         \
  if (!mozilla::IsFinite((f1)+(f2))) {                                        \
    return (rv);                                                              \
  }

#define NS_ENSURE_FINITE4(f1, f2, f3, f4, rv)                                 \
  if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4))) {                              \
    return (rv);                                                              \
  }

#define NS_ENSURE_FINITE5(f1, f2, f3, f4, f5, rv)                             \
  if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5))) {                         \
    return (rv);                                                              \
  }

#define NS_ENSURE_FINITE6(f1, f2, f3, f4, f5, f6, rv)                         \
  if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5)+(f6))) {                    \
    return (rv);                                                              \
  }

// Deletes a linked list iteratively to avoid blowing up the stack (bug 460444).
#define NS_CONTENT_DELETE_LIST_MEMBER(type_, ptr_, member_)                   \
  {                                                                           \
    type_ *cur = (ptr_)->member_;                                             \
    (ptr_)->member_ = nullptr;                                                 \
    while (cur) {                                                             \
      type_ *next = cur->member_;                                             \
      cur->member_ = nullptr;                                                  \
      delete cur;                                                             \
      cur = next;                                                             \
    }                                                                         \
  }

#endif /* nsContentUtils_h___ */