Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:4585:1 (inst/NEWS.Rd:3204): Warning: missing </ul> before </div>
NEWS.html:138:1 (inst/NEWS.Rd:154): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:171:1 (inst/NEWS.Rd:175): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:204:1 (inst/NEWS.Rd:196): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:247:1 (inst/NEWS.Rd:222): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:289:1 (inst/NEWS.Rd:250): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:317:1 (inst/NEWS.Rd:268): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:365:1 (inst/NEWS.Rd:298): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:403:1 (inst/NEWS.Rd:321): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:440:1 (inst/NEWS.Rd:345): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:490:1 (inst/NEWS.Rd:373): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:593:1 (inst/NEWS.Rd:435): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:711:1 (inst/NEWS.Rd:506): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:783:1 (inst/NEWS.Rd:551): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:796:1 (inst/NEWS.Rd:560): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:829:1 (inst/NEWS.Rd:581): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:857:1 (inst/NEWS.Rd:598): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:874:1 (inst/NEWS.Rd:610): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:907:1 (inst/NEWS.Rd:631): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:940:1 (inst/NEWS.Rd:652): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:983:1 (inst/NEWS.Rd:678): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:1000:1 (inst/NEWS.Rd:690): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1056:1 (inst/NEWS.Rd:724): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1074:1 (inst/NEWS.Rd:735): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1091:1 (inst/NEWS.Rd:746): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1118:1 (inst/NEWS.Rd:764): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1151:1 (inst/NEWS.Rd:784): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1189:1 (inst/NEWS.Rd:807): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1257:1 (inst/NEWS.Rd:848): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:1287:1 (inst/NEWS.Rd:868): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1300:1 (inst/NEWS.Rd:877): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1343:1 (inst/NEWS.Rd:904): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1381:1 (inst/NEWS.Rd:927): Warning: <h4> anchor "INSTALLATION" already defined
NEWS.html:1396:1 (inst/NEWS.Rd:937): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1409:1 (inst/NEWS.Rd:946): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1427:1 (inst/NEWS.Rd:958): Warning: <h4> anchor "INSTALLATION" already defined
NEWS.html:1444:1 (inst/NEWS.Rd:970): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1472:1 (inst/NEWS.Rd:991): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1530:1 (inst/NEWS.Rd:1036): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1639:1 (inst/NEWS.Rd:1120): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1657:1 (inst/NEWS.Rd:1132): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1690:1 (inst/NEWS.Rd:1153): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1712:1 (inst/NEWS.Rd:1168): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1735:1 (inst/NEWS.Rd:1183): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:1753:1 (inst/NEWS.Rd:1194): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:1770:1 (inst/NEWS.Rd:1206): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2011:1 (inst/NEWS.Rd:1392): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:2064:1 (inst/NEWS.Rd:1427): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:2230:1 (inst/NEWS.Rd:1560): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:2294:1 (inst/NEWS.Rd:1610): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2384:1 (inst/NEWS.Rd:1665): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:2492:1 (inst/NEWS.Rd:1731): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:2575:1 (inst/NEWS.Rd:1781): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:2591:1 (inst/NEWS.Rd:1791): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:2609:1 (inst/NEWS.Rd:1802): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:2626:1 (inst/NEWS.Rd:1813): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2708:1 (inst/NEWS.Rd:1877): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:2757:1 (inst/NEWS.Rd:1912): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:2874:1 (inst/NEWS.Rd:2003): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:2917:1 (inst/NEWS.Rd:2041): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:2978:1 (inst/NEWS.Rd:2081): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3016:1 (inst/NEWS.Rd:2107): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3170:1 (inst/NEWS.Rd:2228): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3189:1 (inst/NEWS.Rd:2241): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3214:1 (inst/NEWS.Rd:2260): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3246:1 (inst/NEWS.Rd:2283): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3265:1 (inst/NEWS.Rd:2299): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3287:1 (inst/NEWS.Rd:2319): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3313:1 (inst/NEWS.Rd:2340): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3339:1 (inst/NEWS.Rd:2360): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3369:1 (inst/NEWS.Rd:2384): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3420:1 (inst/NEWS.Rd:2420): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3450:1 (inst/NEWS.Rd:2436): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3470:1 (inst/NEWS.Rd:2449): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3493:1 (inst/NEWS.Rd:2465): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3531:1 (inst/NEWS.Rd:2493): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3575:1 (inst/NEWS.Rd:2527): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3605:1 (inst/NEWS.Rd:2547): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3644:1 (inst/NEWS.Rd:2568): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3690:1 (inst/NEWS.Rd:2593): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:3842:1 (inst/NEWS.Rd:2658): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3904:1 (inst/NEWS.Rd:2685): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:3945:1 (inst/NEWS.Rd:2724): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:3970:1 (inst/NEWS.Rd:2742): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:4011:1 (inst/NEWS.Rd:2785): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:4024:1 (inst/NEWS.Rd:2793): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:4054:1 (inst/NEWS.Rd:2816): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:4066:1 (inst/NEWS.Rd:2824): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:4082:1 (inst/NEWS.Rd:2836): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:4110:1 (inst/NEWS.Rd:2856): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:4128:1 (inst/NEWS.Rd:2868): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:4188:1 (inst/NEWS.Rd:2918): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:4217:1 (inst/NEWS.Rd:2939): Warning: <h4> anchor "C-LEVEL-FACILITIES" already defined
NEWS.html:4231:1 (inst/NEWS.Rd:2950): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:4246:1 (inst/NEWS.Rd:2959): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:4269:1 (inst/NEWS.Rd:2976): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:4323:1 (inst/NEWS.Rd:3018): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:4397:1 (inst/NEWS.Rd:3072): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:4431:1 (inst/NEWS.Rd:3100): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:4466:1 (inst/NEWS.Rd:3124): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:4531:1 (inst/NEWS.Rd:3174): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:4543:1 (inst/NEWS.Rd:3181): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:4567:1 (inst/NEWS.Rd:3197): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined