The traverseTo(key, options) method steps are:

1. If this's current entry index is −1, then return an early error result for an "InvalidStateError" DOMException.

2. If this's entry list does not contain a NavigationHistoryEntry whose session history entry's navigation API key equals key, then return an early error result for an "InvalidStateError" DOMException.

3. Return the result of performing a navigation API traversal given this, key, and options.