1. Package parameter `voyager'

This parameter asks for a XML version of the HTML 4.0 output.


2. \Hinclude[*]{unicode.4ht}
\Hinclude[*]{mathml.4ht}

These commands ask to load macro configurations for, respectively, unicode and MathML output. The commands should appear before the \Preamble instruction.


3. -i/.../ht-fonts/unicode/iso88591/

This switch of the t4ht utility asks for unicode fonts in the output, if it points to a subdirectory that holds only fonts of this kind.