However, the user can print out everything on the Web page,
by using the File | Print menu of the browser
(or the keyboard shortcut, e.g. Ctrl+P on Windows systems).
If your script outputs data that users would often
print out, then just remind them to use the File | Print menu.
Also, your script might generate the printable data
in a separate browser window (see example below).
This script generates the multiplication table,
writes it to a new browser window and explains to the user how to print it.