Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The persisted property 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 |
|---|---|---|
| Storage The definition of 'persisted' in that specification. |
Living Standard | Initial definition. |
Browser Compatibility
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 55.0 | 57 (57) | ? | 42 | ? |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | No support | 55.0 | 57.0 (57) | ? | 42 | ? | 55.0 |