Default background color for the plot (defaults to "white").
pointsize
default point size.
standalone
Produce a stand alone svg file? If FALSE, omits
xml header and default namespace.
canvas_id
svg id within HTML page.
fonts
Named list of font names to be aliased with
fonts installed on your system. If unspecified, the R default
families sans, serif, mono and symbol
are aliased to the family returned by match_family().