StorageEvent: oldValue property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
TheoldValue property of theStorageEvent interface returns the original value of the storage item whose value changed.
Value
A string containing the original value of the storage item.
Specifications
| Specification |
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| HTML # dom-storageevent-oldvalue-dev |