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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/StorageManager/persisted below:

StorageManager: persisted() method - Web APIs

StorageManager: persisted() method

Baseline Widely available

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The persisted() method of the StorageManager interface returns a Promise that resolves to true if your site's storage bucket is persistent.

Syntax Parameters

None.

Return value

A Promise that resolves to a Boolean.

Exceptions
TypeError

Thrown if obtaining a local storage shelf failed. For example, if the current origin is an opaque origin or if the user has disabled storage.

Example
if (navigator.storage && navigator.storage.persist) {
  navigator.storage.persisted().then((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 Browser compatibility

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