OptionallowerOpen: booleanOptionalupperOpen: booleanThe lowerBound() static method of the By default, it includes the lower endpoint value and is closed.
Optionalopen: booleanThe only() static method of the IDBKeyRange interface creates a new key range containing a single value.
The upperBound() static method of the it includes the upper endpoint value and is closed.
Optionalopen: boolean
The
bound()static method of the IDBKeyRange interface creates a new key range with the specified upper and lower bounds.MDN Reference