Secure contextThis feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.
The persisted()
method of the StorageManager
interface returns a Promise
that resolves to true
if box mode is persistent for your site's storage.
Syntax
navigator.storage.persisted().then(function(persistent) { ... })
Parameters
None.
Returns
A Promise
that resolves to a Boolean
.
Example
if (navigator.storage && navigator.storage.persist)
navigator.storage.persisted().then(function(persistent) {
if (persistent)
console.log("Storage will not be cleared except by explicit user action");
else
console.log("Storage may be cleared by the UA under storage pressure.");
});
Specifications
Specification | Status | Comment |
StorageThe definition of 'persisted' in that specification. | Living Standard | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
persisted
|
Chrome Full support 52 Full support 52 No support 48 — 52 Alternate Name' Uses the non-standard name: |
Edge
Full support ≤79 |
Firefox
Full support 55 |
IE
No support No |
Opera
Full support Yes |
Safari
? |
WebView Android Full support 52 Full support 52 No support 48 — 52 Alternate Name' Uses the non-standard name: |
Chrome Android Full support 52 Full support 52 No support 48 — 52 Alternate Name' Uses the non-standard name: |
Firefox Android
Full support 55 |
Opera Android
Full support Yes |
Safari iOS
? |
Samsung Internet Android Full support 6.0 Full support 6.0 No support 5.0 — 6.0 Alternate Name' Uses the non-standard name: |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Uses a non-standard name.'
- Uses a non-standard name.
StorageManager.persisted() by Mozilla Contributors is licensed under CC-BY-SA 2.5.