Indicates the current value associated with the form control that is submitted with the name/value pair for the element. For a fileUpload object, this value is the URL-encoded full pathname to the local file. This is true even for the Macintosh browser versions, which tend to display only the file's name in the form element display. While the property accepts new value assignments in some browsers, only values assigned as a result of a user's explicit file menu choice get submitted.