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.perisisted().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
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 |