Sources

The links an answer was drawn from, as a folding list under the reply or a small marker inside the text.

Anotomy

Structure of the source list and how its parts are composed. These are its semantic parts, so they are also what the classNames and styles objects accept.
Sources anotomy
NameDescription
1rootThe whole block.
2titleThe toggle row, from title. Clicking it opens and closes the list.
3contentThe list of items. expanded and defaultExpanded decide whether it shows.