2.1.39 [W3C-HTML52] Section 4.10.5.1.1. Hidden state (type=hidden)

V0150: The files attribute returns undefined, not null

The specification states:

 4.10.5.1.1 Hidden state (type=hidden)   
     ...
     Bookkeeping details
         ...
         ▪  The following IDL attributes and methods do not apply to the element: checked, 
         files, list, selectionStart, selectionEnd, selectionDirection, valueAsDate, and 
         valueAsNumber IDL attributes; select(), setRangeText(), setSelectionRange(), 
         stepDown(), and stepUp() methods.

EdgeHTML Mode

The files attribute returns undefined, not null.