renderer that renders
the information as a series of html tagstranslator_html(x, size)space_html()
newline_html()
renderer_html(document = TRUE, translator = translator_html,
formatter = formatter_html, space = space_html, newline = newline_html,
header = header_html(document, stylesheet),
footer = footer_html(document), stylesheet = "default", ...)
header_html and
formatter_htmlgetStyleFile for details
on wherehighlightrenderer for a description of the interface
this renderer is implementing. highlight takes a renderer argument to which it
delegates rendering.