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StorageManager: persist() method

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The persist() method of the StorageManager interface requests permission to use persistent storage, and returns a Promise that resolves to true if permission is granted and bucket mode is persistent, and false otherwise.

Syntax

persist()

Parameters

None.

Return value

A Promise that resolves to a Boolean.

Example

if (navigator.storage && navigator.storage.persist) {
  navigator.storage.persist().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

Specification
Storage Standard # ref-for-dom-storagemanager-persist

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`persist`	55	79	57	No	42	15.2	55	55	57	42	15.2	6.0

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