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I was pretty sure the answer was NO, and hence google gears, adobe AIR, etc.
If I was right, then how does http://tiddlywiki.com work? It is persistent and written in javascript. It is also just a single HTML file that has no external (serverside) dependencies. WTF? Where/how does it store its state?
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The main idea of the solution is: the JavaScript code cannot access the file by having its local URL. But it can use the file by having its DataURL: so if the user browses a file and opens it, JavaScript should get the "DataURL" directly from HTML instead of getting "URL".
It can be concluded that although JavaScript cannot access local files directly due to privacy and security, the file can be selected through the “file input” element which can process the file. A “File Reader” can then be used to access the content of the selected files.
Web browsers (and JavaScript) can only access local files with user permission. To standardize the file access from the browser, the W3C published the HTML5 File API in 2014. It defines how to access and upload local files with file objects in web applications.
A file system is the factory for several types of objects: The getPath method converts a system dependent path string, returning a Path object that may be used to locate and access a file. The getPathMatcher method is used to create a PathMatcher that performs match operations on paths.
Tiddlywiki has several methods of saving data, depending on which browser is used. As you could see in the source.
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