By default, HTML objects display their HTML markup at the console when
printed. browsable can be used to make specific objects render as HTML
by default when printed at the console.
browsable(x, value = TRUE)
is.browsable(x)browsable returns x with an extra attribute to indicate
that the value is browsable.
is.browsable returns TRUE if the value is browsable, or
FALSE if not.
You can override the default browsability of an HTML object by explicitly
passing browse = TRUE (or FALSE) to the print function.