Dedicated directory for web-apps

Hello everyone,

I'm certainly not the first to think or to propose, but I think there is a
huge deficiency on web-apps: there is no real dedicated directory for the
application persistent data, where the app could read/write files without user
intervention.


Why this umpteenth interest in such a feature requiring enhanced security?
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I'm currently developing a web-app to communicate securely via an Encryption
Algorithm that I developed.

Considering that my users have a real need for such security, it goes
without saying that they also need persistence.

If the user clears its cache, he lose all application "persistent" data
saved by LocalStorage and/or IndexedDB, then it needs a persistence... more
persistent.


Why "without user intervention"?
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Simply because it would be rather inconvenient to ask the user to
store dataon each
message.

My idea is when the confirmation of installation, a message informs the user
that the application will create the folder and will have rights to
read/write, as well as its sub-folders (never a parent).

This could also allow the user to store downloaded data in its preferred
application (for example, because it is specially adapted to read). This
would avoid having to re-download it especially if all emptied cache (in most
countries, a mobile connection is still paying the volume of data transfer).


Thanks for your advices.

Cordialy,
Michaël Rouges