Add WebPlatform Docs Annotations to any document

snippet.html

<script>
(function () {
  var ssl = !! document.location.protocol.match(/^https:/),
      embedUrl = 'http://notes.webplatform.org/app/embed.js';

  if (ssl && !embedUrl.match(/^https:/)) {
    var msg = ['Sorry, but this service is unavailable on pages ',
                                                                                                               'served with HTTPS at this time. Please contact support for ',
                                                                                                               'further assistance.'];

    alert(msg.join(''));
  }
  else {
    var embed = document.createElement('script');
    embed.setAttribute('src', embedUrl);
    document.body.appendChild(embed);
  }
})();
</script>