An object of this type is returned by the 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.
Gecko 1.9.2 note
Prior to Gecko 1.9.2, the input element only supported a single file being selected at a time, meaning that the FileList would contain only one file. Starting with Gecko 1.9.2, if the input element's multiple attribute is true, the FileList may contain multiple files.