example.html

<style>
  body {
    padding: 50px;
  }
  canvas {
    border: 1px solid #eee;
  }
</style>

<script src="build/build.js"></script>

<canvas width=900 height=300></canvas>

<script>
  var x = 0;
  var y = 50;
  var canvas = document.querySelector('canvas');
  var ctx = canvas.getContext('2d');
  var raf = require('raf');

  function animate() {
    raf(animate);
    draw();
  }

  var prev = Date.now();
  function draw() {
    var curr = Date.now();
    var diff = curr - prev;
    var p = diff / 16;
    ctx.clearRect(0, 0, 900, 300);
    ctx.beginPath();
    ctx.globalAlpha = .5;
    ctx.arc(x, y, 10, 0, Math.PI * 2, false);
    ctx.fill();
    x += 2;
    y += Math.sin(x/20) * 5;
    prev = curr;
  }

  animate();
</script>