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I have created a bookmarklet that tries to read and write with localStorage with the following data: url:
data:text/html;base64,PGRvY3R5cGUgaHRtbD4KPGh0bWw+Cjxib2R5Pgo8c2NyaXB0Pgpsb2NhbFN0b3JhZ2Uuc2V0SXRlbSgnY29udGVudCcsICdoZWxsbyB3b3JsZCcpOwpkb2N1bWVudC53cml0ZShsb2NhbFN0b3JhZ2UuZ2V0SXRlbSgnY29udGVudCcpKTsKPC9zY3JpcHQ+CjwvYm9keT4KPC9odG1sPg==
This translates to following code in the browser:
<doctype html>
<html>
<body>
<script>
localStorage.setItem('content', 'hello world');
document.write(localStorage.getItem('content'));
</script>
</body>
</html>
This code tries to write the string hello world to the browser's localStorage, read the string and finally write it to the page.
However, this results in the following error:
Uncaught SecurityError: Failed to read the 'localStorage' property from 'Window': Storage is disabled inside 'data:' URLs.
As this approach doesn't work, it brings me to the question: How to save data to the browser with data: URL? Is there some other API than localStorage that I could use to save data in data: URLs?
EDIT:
Cookies do not work. Trying to access cookies gives the following error:
Uncaught DOMException: Failed to read the 'cookie' property from 'Document': Cookies are disabled inside 'data:' URLs.
EDIT 2:
File system API does not work either. Fails with the error object:
655
A Data URL is a URI scheme that provides a way to inline data in an HTML document. or you can encode it in a special format, called Data URL, which makes it possible to embed the image directly in the HTML document, so the browser does not have to make a separate request to get it.
HTML web storage provides two objects for storing data on the client: window.localStorage - stores data with no expiration date. window.sessionStorage - stores data for one session (data is lost when the browser tab is closed)
Why not use 0x0 images to query a HTTPS origin that simply stores data in a query string to a cookie so you can retrieve it by loading a dynamic script file based on the cookie content? If that origin caches itself, it will run offline.
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