Sitefinity Link Manager Anchors
From these two threads:
http://www.sitefinity.com/devnet/forums/sitefinity-3-x/general-discussions/anchor-tags.aspx
http://www.sitefinity.com/devnet/forums/sitefinity-3-x/suggestions/bring-back-anchor-editing-inserting.aspx
I was able to ascertain that in earlier versions of SF there's not anchor tag management in the Link Manager that SF uses.
I don't see anchor tags in 4.3 either. Is this still something that is not supported?