std::string h_graphics;
std::string h_default_output_format;
std::string h_html_be_strict;
std::string h_html_css_as_file;
std::string h_html_math_output;
std::string h_graphics;
std::string h_default_output_format;
std::string h_html_be_strict;
std::string h_html_css_as_file;
std::string h_html_math_output;