The portal.hdgroup.org URLs have a nice feature in that they encode the name of the function n the URL:
The new docs.hdfgroup.org URLs use numbered “title” anchors.
I would be nice if the new docs had predictable anchors for the function names. For example, it would great if the following worked.
In the Julia language package HDF5.jl, we generate our documentation with links to the online HDF5 documentation because of the predictability of the URLs. It would be sad to lose this if the old documentation were to go away.