This change adds a dictionary to the returned dictionary of storageManager.estimate() that contains details about usage for each storage backend. The goal is to aid in debugging issues around overuse of specific storage systems.


This change is useful in debugging usage between the various storage systems. Right now, this information is already available to origin's if they manually keep track of the usage delta with each call to a storage API.



Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.



Web developer support:

Search tags

quota, estimate, usage, usage details, usage breakdown,

Last updated on 2021-12-13