Running tidy with the "-e --gnu-emacs true" on the javadoc and standard doclet man pages gives the following report

 ---- begin processing javadoc.html
javadoc.html:1166:5: Warning: <span> anchor "option-Xdoclint" already defined
javadoc.html:1197:5: Warning: <span> anchor "option-Xdoclint" already defined

 ---- begin processing std-doclet-output.html
std-doclet-output.html:320:1: Warning: <span> anchor "details" already defined
std-doclet-output.html:826:1: Warning: <span> anchor "packages" already defined