I will have a content fragment appearing in three places:
1) The "original" location which is a section of a long page.
2) The content fragment by itself on a page.
3) 2) in an iframe on another site.
How do I get as much link juice as possible to one? Should the canonical tag just go to example.com/original or to example.com/original#specific-bit
Can I get link juice though the iframe
2) should not be directly seen by users, so a canonical tag looks right, but should it point to the whole page, or to the anchor on the specfic content it reproduces?
I have no idea how best to handle 3).