index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Webpack App</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <style>
      * { margin:0; padding:0 }
      html, body { width:100%; height:100% }
      canvas { display:block; background-color: black; width: 100vw; height: 100vh}
    </style>
  </head>
  <body>
  <script type="text/javascript">
    var demo = null
    window.addEventListener('load', () => {
      const canvas = document.createElement('canvas')
      canvas.setAttribute('width', window.innerWidth)
      canvas.setAttribute('height', window.innerHeight)
      document.body.appendChild(canvas)
      demo = new ParticleField(canvas, {
        stateSize: 5,
        trailLength: 500,
        debug: true
      })

      demo.start()
    })
    </script>
  </body>
</html>