Save the specified HTML object to a file, copying all of it's
dependencies to the directory specified via libdir.
save_html(html, file, background = "white", libdir = "lib", lang = "en")HTML content to print
File path or connection. If a file path containing a sub-directory, the sub-directory must already exist.
Background color for web page
Directory to copy dependencies to
Value of the `<html>` `lang` attribute