Finds the next node in reading order matching a target, loading pages as it walks.
public AccessibleNode? FindNext(AccessibleNode? from, AccessibleNavigation target, bool backward = false, int level = 0)
The node to start after (before, backwards); null or the document starts at the document's edge.
What to find.
True to walk backwards.
For headings, the level to find; 0 for any.