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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 CompatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	?	55	?	Yes	?

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	?	55	Yes	?	?

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https://developer.mozilla.org/en-US/docs/Web/API/StorageManager/persisted