Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:1301:1 (inst/NEWS.Rd:721): Warning: missing </ul> before </div>
NEWS.html:73:1 (inst/NEWS.Rd:35): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:105:1 (inst/NEWS.Rd:55): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:123:1 (inst/NEWS.Rd:65): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:143:1 (inst/NEWS.Rd:76): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:167:1 (inst/NEWS.Rd:88): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:208:1 (inst/NEWS.Rd:111): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:225:1 (inst/NEWS.Rd:122): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:260:1 (inst/NEWS.Rd:141): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:278:1 (inst/NEWS.Rd:153): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:339:1 (inst/NEWS.Rd:183): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:389:1 (inst/NEWS.Rd:214): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:409:1 (inst/NEWS.Rd:224): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:425:1 (inst/NEWS.Rd:233): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:467:1 (inst/NEWS.Rd:257): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:519:1 (inst/NEWS.Rd:289): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:531:1 (inst/NEWS.Rd:295): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:559:1 (inst/NEWS.Rd:311): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:576:1 (inst/NEWS.Rd:321): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:600:1 (inst/NEWS.Rd:333): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:646:1 (inst/NEWS.Rd:367): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:673:1 (inst/NEWS.Rd:383): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:688:1 (inst/NEWS.Rd:392): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:715:1 (inst/NEWS.Rd:407): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:731:1 (inst/NEWS.Rd:416): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:742:1 (inst/NEWS.Rd:421): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:763:1 (inst/NEWS.Rd:432): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:783:1 (inst/NEWS.Rd:442): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:805:1 (inst/NEWS.Rd:456): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:838:1 (inst/NEWS.Rd:476): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:855:1 (inst/NEWS.Rd:483): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:871:1 (inst/NEWS.Rd:492): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:893:1 (inst/NEWS.Rd:502): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:930:1 (inst/NEWS.Rd:521): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:983:1 (inst/NEWS.Rd:550): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:1000:1 (inst/NEWS.Rd:559): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1012:1 (inst/NEWS.Rd:565): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1047:1 (inst/NEWS.Rd:584): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1076:1 (inst/NEWS.Rd:601): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1108:1 (inst/NEWS.Rd:617): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:1133:1 (inst/NEWS.Rd:631): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1159:1 (inst/NEWS.Rd:645): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1177:1 (inst/NEWS.Rd:653): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:1195:1 (inst/NEWS.Rd:663): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1209:1 (inst/NEWS.Rd:671): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:1228:1 (inst/NEWS.Rd:683): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1261:1 (inst/NEWS.Rd:702): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1284:1 (inst/NEWS.Rd:713): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined