Draws a rectangle with background and/or border. The ContentArea ist similar to the ChartArea but also contains the background of the legend.
<contentArea>
<style>style1</style>
<padding>0.04 * $chartShorterSide</padding>
<paddingTop>0.045 * $chartShorterSide</paddingTop>
<borderRoundness>5</borderRoundness>{{:contentarea.png|}}
</contentArea>
All elements not affected by ChartAreaOption have been grayed out.