https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96995
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- If you have a relative URL like href="../../api/namespaces.html" then it only works if the user has the API docs at that relative location. If you have an absolute URL like href="https://gcc.gnu.org/onlinedocs/gcc-10.2.0/libstdc++/manual/manual/../../api/namespaces.html"; then I don't see any advantage to your suggestion, since it still needs the "gcc-10.2.0" version in the URL, which requires modifying the docs for each release as I said (or fixing them up in the maintainer-scripts/generate_libstdcxx_web_docs script).
