This article is in need of a technical review.
This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
path property provides the full path to the file affected by the change.
var path = instanceOfDeviceStorageChangeEvent.path;
A string representing a file's path name.
Not part of any specification.