Intent to Implement and Ship: "persistent-storage" support for Permission API's query() method
Joshua Bell
Contact emails
Summary
The Storage API [1] and Permissions API [2] define the "persistent-storage" enum value for the set of permissions that can be used with the Permission API. This is not a new permission/capability - it can already be queried with navigator.storage.persisted(), but with this change navigator.permissions.query({name:"persistent-storage"}) can be used as well.
[1] https://storage.spec.whatwg.org/
[2] https://w3c.github.io/permissions
Tracking bug: https://crbug.com/878525
There should be a uniform method of querying a permission's state. The Storage spec also gives examples using the API.
Risks
Interoperability and Compatibility
No compat risk.
Edge: No signals (storage API not supported)
Firefox: Shipped
Safari: No signals (storage API not supported)
Web developers: Unknown
Ergonomics
This bridges the Storage API and Permissions API, as is done for other features that define permissions.
Activation
No need for specific documentation. Developers can already use navigator.storage.persisted()
Debuggability
It appears there is work ongoing (see https://crbug.com/631464) for adding permission query/grant control via DevTools, so hopefully this appears "for free". The plumbing for the internal *DURABLE_STORAGE* permission type is already present.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
Is this feature fully tested by web-platform-tests?
No existing WPTs, but test added to storage/ in the CL.
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/4770049554382848
Requesting approval to ship?
Yes.
Rick Byers
Link to entry on the feature dashboard
https://www.chromestatus.com/feature/4770049554382848
Requesting approval to ship?
Yes.
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Yoav Weiss
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Chris Harrelson
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