Async Lead Dyno script

leaddyno.html

<script>
(function(key) {
  var script = document.createElement('script');
  script.src = 'https://static.leaddyno.com/js';
  script.async = true;
  script.onload = function () {
    LeadDyno.key = key;
    LeadDyno.recordVisit();
    LeadDyno.autoWatch();
  };
  document.body.appendChild(script);
})('<lead-dyno-key>');
</script>