Returns the list of the file extensions acceptable by the file chooser. The acceptable
file extensions are based on the accept attribute value of the HTML input
element. The extensions do not include the preceding dot character. The list is empty in
case no accept attribute is specified or its value is empty.
default java.lang.String filterDescription()
Returns a string that represents the meaningful (e.g. "Image files", "PDF File (.pdf)",
etc.) description of the acceptable extensions. In case no extensions are provided, the
value is empty, which implies that any file type is acceptable.