Found the following validation problem for the NEWS.Rd HTML conversion:
NEWS.html:69:1 (inst/NEWS.Rd:27): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:102:1 (inst/NEWS.Rd:44): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:117:1 (inst/NEWS.Rd:52): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:132:1 (inst/NEWS.Rd:60): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:166:1 (inst/NEWS.Rd:79): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:189:1 (inst/NEWS.Rd:91): Warning: <h4> anchor "User-visible-changes" already defined
NEWS.html:239:1 (inst/NEWS.Rd:121): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:258:1 (inst/NEWS.Rd:132): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:284:1 (inst/NEWS.Rd:145): Warning: <h4> anchor "User-visible-changes" already defined
NEWS.html:307:1 (inst/NEWS.Rd:158): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:318:1 (inst/NEWS.Rd:163): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:339:1 (inst/NEWS.Rd:175): Warning: <h4> anchor "User-visible-changes" already defined
NEWS.html:366:1 (inst/NEWS.Rd:190): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:377:1 (inst/NEWS.Rd:195): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:413:1 (inst/NEWS.Rd:214): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:424:1 (inst/NEWS.Rd:219): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:462:1 (inst/NEWS.Rd:239): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:478:1 (inst/NEWS.Rd:247): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:494:1 (inst/NEWS.Rd:256): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:512:1 (inst/NEWS.Rd:265): Warning: <h4> anchor "User-visible-changes" already defined
NEWS.html:553:1 (inst/NEWS.Rd:286): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:567:1 (inst/NEWS.Rd:292): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:583:1 (inst/NEWS.Rd:301): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:597:1 (inst/NEWS.Rd:309): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:616:1 (inst/NEWS.Rd:319): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:632:1 (inst/NEWS.Rd:328): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:643:1 (inst/NEWS.Rd:333): Warning: <h4> anchor "Bug-fixes" already defined
NEWS.html:658:1 (inst/NEWS.Rd:341): Warning: <h4> anchor "Miscellaneous" already defined
NEWS.html:672:1 (inst/NEWS.Rd:347): Warning: <h4> anchor "Bug-fixes" already defined