We want to attach un-limited quantity of files
(folders with files) to form by one control
therefore textual input field in control loses any sense -
it's necessary to remove it and to leave only button.
Sometimes it's necessary, that tree of file system was showed not in
a separate window, but inside a document.
I offer to add attribute
look into tag
Attribute can accept two values:
button (default value) and
If user attach directories with sub-directories and files,
then they are coded in the following way at
(browser itself assign arbitrary, but different values into attribute