,
  <span class='kw'>fill_colour</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>fill_opacity</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>stroke_colour</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>stroke_width</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>stroke_opacity</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>tooltip</span>