Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:1270:1 (inst/NEWS.Rd:778): Warning: missing </ul> before </div>
NEWS.html:53:1 (inst/NEWS.Rd:27): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:68:1 (inst/NEWS.Rd:36): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:116:1 (inst/NEWS.Rd:65): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:130:1 (inst/NEWS.Rd:73): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:153:1 (inst/NEWS.Rd:87): Warning: <h4> anchor "Misc" already defined
NEWS.html:169:1 (inst/NEWS.Rd:96): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:184:1 (inst/NEWS.Rd:104): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:219:1 (inst/NEWS.Rd:128): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:243:1 (inst/NEWS.Rd:139): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:259:1 (inst/NEWS.Rd:148): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:274:1 (inst/NEWS.Rd:157): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:285:1 (inst/NEWS.Rd:162): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:310:1 (inst/NEWS.Rd:178): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:326:1 (inst/NEWS.Rd:187): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:351:1 (inst/NEWS.Rd:204): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:374:1 (inst/NEWS.Rd:218): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:390:1 (inst/NEWS.Rd:227): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:404:1 (inst/NEWS.Rd:235): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:420:1 (inst/NEWS.Rd:244): Warning: <h4> anchor "Misc" already defined
NEWS.html:435:1 (inst/NEWS.Rd:252): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:451:1 (inst/NEWS.Rd:261): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:472:1 (inst/NEWS.Rd:274): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:493:1 (inst/NEWS.Rd:287): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:504:1 (inst/NEWS.Rd:292): Warning: <h4> anchor "Misc" already defined
NEWS.html:522:1 (inst/NEWS.Rd:302): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:540:1 (inst/NEWS.Rd:313): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:556:1 (inst/NEWS.Rd:322): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:570:1 (inst/NEWS.Rd:330): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:596:1 (inst/NEWS.Rd:348): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:643:1 (inst/NEWS.Rd:383): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:679:1 (inst/NEWS.Rd:408): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:695:1 (inst/NEWS.Rd:417): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:707:1 (inst/NEWS.Rd:423): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:745:1 (inst/NEWS.Rd:451): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:771:1 (inst/NEWS.Rd:468): Warning: <h4> anchor "USER-VISIBLE-CHANGES" already defined
NEWS.html:782:1 (inst/NEWS.Rd:473): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:801:1 (inst/NEWS.Rd:485): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:822:1 (inst/NEWS.Rd:498): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:838:1 (inst/NEWS.Rd:507): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:866:1 (inst/NEWS.Rd:526): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:888:1 (inst/NEWS.Rd:540): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:906:1 (inst/NEWS.Rd:551): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:924:1 (inst/NEWS.Rd:561): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:945:1 (inst/NEWS.Rd:574): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:992:1 (inst/NEWS.Rd:608): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1003:1 (inst/NEWS.Rd:613): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1023:1 (inst/NEWS.Rd:624): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1079:1 (inst/NEWS.Rd:664): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1107:1 (inst/NEWS.Rd:684): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1118:1 (inst/NEWS.Rd:689): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1135:1 (inst/NEWS.Rd:699): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1156:1 (inst/NEWS.Rd:712): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1171:1 (inst/NEWS.Rd:720): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1209:1 (inst/NEWS.Rd:747): Warning: <h4> anchor "NEW-FEATURES" already defined
NEWS.html:1220:1 (inst/NEWS.Rd:752): Warning: <h4> anchor "BUG-FIXES" already defined
NEWS.html:1235:1 (inst/NEWS.Rd:762): Warning: <h4> anchor "NEW-FEATURES" already defined