html_styled_ostream class supports styled output to any
destination, in HTML syntax. Its type is ‘html_styled_ostream_t’.
It is a subclass of ‘styled_ostream_t’.
It can be instantiated through this function:
Creates an output stream that takes input in the UTF-8 encoding and
writes it in HTML form on
destination, styled with the file
Note: The resulting stream must be closed before
can be closed.