StorageManager.persisted()

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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

52

48 — 521

?55 ? Yes ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support

52

48 — 521

52

48 — 521

?55 Yes ? ?

1. Supported as persistentPermission.

Document Tags and Contributors

Contributors to this page: ddbeck, chrisdavidmills, YourDoge, shawn_huang, david_ross, jpmedley
Last updated by: ddbeck,