<script src="/s/processingmin.js"></script>
<script type="text/processing" data-processing-target="pjs">
function setup() {
$p.size(400, 400);
}
$p.setup = setup;
function draw() {
$p.background(255,0,0);
$p.rect(200,200,200,200);
}
$p.draw = draw;
</script>
<canvas id="pjs"> </canvas>