Because of various security issues, what you really want is something like this web standard going forward: https://developer.chrome.com/docs/web-platform/web-b

Because of various security issues, what you really want is something like this web standard going forward: https://developer.chrome.com/docs/web-platform/web-bundles https://developer.chrome.com/docs/web-platform/web-bundles and combine that with the js file APIs for working with data files.