A-Frame Course - Source of /examples/0500-environments-04-particles.html

<!DOCTYPE html>
<html>
  <head>
    <title>Environments Example</title>
    <script src="https://aframe.io/releases/1.4.1/aframe.min.js"></script>
    <script src="https://unpkg.com/aframe-environment-component@1.3.7/dist/aframe-environment-component.min.js"></script> 
    <script src="https://cdn.jsdelivr.net/gh/c-frame/aframe-particle-system-component@1.1.4/dist/aframe-particle-system-component.min.js"></script>

  </head>
  <body>
    <a-scene>
      <a-entity environment="preset: contact; playArea: 10; "></a-entity>

      <a-entity particle-system="preset: snow"></a-entity>
    </a-scene>
  </body>
</html>