If you close the browser, close the WipeAway tab, or navigate away while a deletion is in progress, the deletion will pause at its current point.
Events that were already deleted before the browser was closed are gone permanently — they will not reappear. WipeAway does not roll back a partial deletion.
Events that had not yet been processed when the browser was closed are unaffected — they remain in your calendar exactly as they were.
Because WipeAway only deletes events that still exist in your calendar, you cannot accidentally delete anything twice.
The count will be lower than before. This is correct — it reflects the events still remaining after the partial deletion. The number you see is exactly what will be removed when you confirm.