WindowHistory owns the entry list, current index, and state cache revision. Push and replace operations preserve forward-entry and scroll-restoration semantics.
HistoryEntry stores URL and identity metadata, scroll position and restoration mode, and immutable serialized History/Navigation state.
Entry references can outlive their membership in a history, so a retained NavigationHistoryEntry remains readable after replacement or pruning.

moli-session-history coordinates the traversable's joint history across documents and frames. moli-history stores each Window's native view of those entries. moli-page-types transports serialized snapshots across document or VM replacement.

The renderer provides the structured-clone codec and JS bindings. World-specific History wrappers share the same native WindowHistory; each caches its own deserialized history.state. Weak V8 wrapper registrations lease native records without keeping JS contexts alive. Serialized values contain immutable bytes and trusted native attachments such as Blob data, never realm-local JS handles.