[p5.js] Hello p5.js

Source Code:
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.7.3/p5.js"></script> 
 
<script>
    function setup() {
      var canvas = createCanvas(640, 480);
      canvas.parent('sketch-canvas');
    }

    function draw() {
      if (mouseIsPressed) {
        fill(0);
      } else {
        fill(255);
      }
      ellipse(mouseX, mouseY, 80, 80);
    }
</script>


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