files property of the HTML <input> element; this lets you access the list of files selected with the <input type="file"> element. It's also used for a list of files dropped into web content when using the drag and drop API; see the DataTransfer object for details on this usage.A read-only value indicating the number of files in the list.
Promise<number>Returns a File object representing the file at the specified index in the file list.
number. Needs content.File