Returns the best PNG-based graphics device for your system, in the opinion of
the htmltools
maintainers. On Mac,
grDevices::png()
is used; on all other
platforms, either ragg::agg_png()
or
Cairo::CairoPNG()
are used if their packages
are installed. Otherwise, grDevices::png()
is
used.
defaultPngDevice()
A graphics device function.