# localStorage

The **`localStorage`** read-only property of the [`window`](https://developer.mozilla.org/en-US/docs/Web/API/Window) interface allows you to access a [`Storage`](https://developer.mozilla.org/en-US/docs/Web/API/Storage) object for the [`Document`](https://developer.mozilla.org/en-US/docs/Web/API/Document)'s [origin](https://developer.mozilla.org/en-US/docs/Glossary/Origin); the stored data is saved across browser sessions.

`localStorage` is similar to [`sessionStorage`](https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage), except that while `localStorage` data has no expiration time, `sessionStorage` data gets cleared when the page session ends — that is, when the page is closed. (`localStorage` data for a document loaded in a "private browsing" or "incognito" session is cleared when the last "private" tab is closed.)

Source: [https://zhidao.baidu.com/question/304730398919931564.html](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://doc.bitbrowser.net/fingerprint/8.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.