Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:999:1 (inst/NEWS.Rd:692): Warning: missing </ul> before </div>
NEWS.html:100:1 (inst/NEWS.Rd:113): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:117:1 (inst/NEWS.Rd:121): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:131:1 (inst/NEWS.Rd:128): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:146:1 (inst/NEWS.Rd:137): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:157:1 (inst/NEWS.Rd:143): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:192:1 (inst/NEWS.Rd:165): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:209:1 (inst/NEWS.Rd:175): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:223:1 (inst/NEWS.Rd:183): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:240:1 (inst/NEWS.Rd:193): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:255:1 (inst/NEWS.Rd:203): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:278:1 (inst/NEWS.Rd:217): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:295:1 (inst/NEWS.Rd:228): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:321:1 (inst/NEWS.Rd:244): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:336:1 (inst/NEWS.Rd:252): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:353:1 (inst/NEWS.Rd:262): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:371:1 (inst/NEWS.Rd:273): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:391:1 (inst/NEWS.Rd:288): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:406:1 (inst/NEWS.Rd:299): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:418:1 (inst/NEWS.Rd:309): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:433:1 (inst/NEWS.Rd:320): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:451:1 (inst/NEWS.Rd:334): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:462:1 (inst/NEWS.Rd:340): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:477:1 (inst/NEWS.Rd:348): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:494:1 (inst/NEWS.Rd:359): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:516:1 (inst/NEWS.Rd:373): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:529:1 (inst/NEWS.Rd:382): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:554:1 (inst/NEWS.Rd:398): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:580:1 (inst/NEWS.Rd:410): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:607:1 (inst/NEWS.Rd:424): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:628:1 (inst/NEWS.Rd:435): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:643:1 (inst/NEWS.Rd:443): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:678:1 (inst/NEWS.Rd:458): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:692:1 (inst/NEWS.Rd:465): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:723:1 (inst/NEWS.Rd:484): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:742:1 (inst/NEWS.Rd:497): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:760:1 (inst/NEWS.Rd:510): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:779:1 (inst/NEWS.Rd:523): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:801:1 (inst/NEWS.Rd:539): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:853:1 (inst/NEWS.Rd:574): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:925:1 (inst/NEWS.Rd:635): Warning: <h4> anchor "OTHER-USER-VISIBLE-CHANGES" already defined
NEWS.html:962:1 (inst/NEWS.Rd:671): Warning: <h4> anchor "DEPRECATED-+26-DEFUNCT" already defined
NEWS.html:979:1 (inst/NEWS.Rd:682): Warning: <h4> anchor "BUG-FIXES" already defined