Character limitations with saving form data
We are not aware of any limitations about number of characters / max length of a string as neither the CSV-standard nor our method 'writeData' have such limitations.
The main limitation is the size of the hard disk and
window.writeToFile(filename, data, callback) returns an error if write data operation fails. While we have used HTML5 local storage for projects in the past, it appears that UIWebView currently supports local WebSQL databases as well.
With that said, support for both is part of the rendering browsers we are required to use by Apple (Apple's UIWebview & WKWebView browser) so we don't have any control over whether they will be supported in future versions (we're guessing they will, but just want to make it clear that this possibility exists).