Structure of the anchor and how its internal parts are composed. These are its semantic parts, so they are also what the classNames and styles objects accept.
Name
Description
1
root
The list of links, with the rail down its side. direction lays it out in a row, and affix pins it while the page scrolls.
2
item
One link, from an entry in items. An entry's children are indented under it.
3
itemTitle
The link's text, from the item's title. It points at the item's href.
4
indicator
The bar on the rail beside the link whose section is in view. It slides as the reader scrolls.