In Webkit there is currently no way to determine if a file drop is a folder or not. * Chrome returns a FileList with a length of 0. * Firefox returns a FileList with a length of 1, but always reports a file size of 0 for folders, so you can provide a workaround. * Webkit allows the folder to be dropped, and the file size varies depending on the folder contents. http://stackoverflow.com/questions/4857846/html5-drag-and-drop-detect-folders-in-safari-filelist-file http://jsfiddle.net/meleyal/4CX6X/15/
Bump. This is pretty important to get fixed.
<rdar://problem/10455287>
Still dealing with this bug in 2018. I'd love to see it fixed.