domaincanary-gtm.html

<script type="text/javascript" src="https://unpkg.com/[email protected]/promise.min.js"></script>
<script type="text/javascript" src="https://unpkg.com/[email protected]/fetch.js"></script>
<script type="text/javascript">
  (function() {
    // Add your settings.
    var dcWhitelist = ['YOUR_ORIGIN']
      , dcKey = encodeURIComponent('YOUR_KEY');

    // Check against the whitelist.
    var dcOrigin = document.location.protocol + '//' + document.location.host;
    if(dcWhitelist.indexOf( dcOrigin ) == -1) {
      fetch('https://service.domaincanary.co/hit/?key=' + dcKey + '&origin=' + encodeURIComponent(dcOrigin)).then(function(resp) {
      	return resp.json();
      }).then(function(resp){});
    }
  })();
</script>