code: def render_html(root, options=0, extensions=None):
      
      if extensions is None:
          extensions = _cmark.ffi.NULL
  
      raw_result = _cmark.lib.cmark_render_html(
          root, options, extensions)
  
      return _cmark.ffi.string(raw_result).decode('utf-8')
docs: Render a given syntax tree as HTML.
  
      Args:
          root (Any): The reference to the root node of the syntax tree.
          options (int): The cmark options.
          extensions (Any): The reference to the syntax extensions, generally
              from :func:`parser_get_syntax_extensions`
  
      Returns:
          str: The rendered HTML.