At the moment, we don't have a user-visible 'Trash' feature or page history. If you need them, please comment at our public roadmap: page history, restoring deleted pages.
However, internally we keep track of all page versions and can restore them.
Please contact us through the support widget if you:
Note: if you see the "Saving..." indicator on the page, it means the page has not been saved yet. If your internet connection broke and then you closed the tab, the page would not be saved. In this case we would not be able to restore the page — it had never reached the server in the first place.