I've just noticed that the Youtube events (onReady, onStateChange) are no longer firing when I am testing in my local, but works when I upload the code to JsFiddle. I've decided to copy and paste the code from Youtube Player API where I am able to verify that it indeed is not working. Is anyone else having this issue? This issue occurs on Chrome, Firefox, IE, Safari, and Opera.
EDIT - When I console.log(player); in my local, I see that it is missing a lot of Youtube functions such as seekTo(), setVolume(), showVideoInfo() which are present in JsFiddle. I am unsure why this is happening, but I believe this might be the root of my problem. Any ideas?
<!DOCTYPE html>
<html>
  <body>
    <!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
    <div id="player"></div>
    <script>
      // 2. This code loads the IFrame Player API code asynchronously.
      var tag = document.createElement('script');
      tag.src = "https://www.youtube.com/iframe_api";
      var firstScriptTag = document.getElementsByTagName('script')[0];
      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
      // 3. This function creates an <iframe> (and YouTube player)
      //    after the API code downloads.
      var player;
      function onYouTubeIframeAPIReady() {
        player = new YT.Player('player', {
          height: '190',
          width: '140',
          videoId: 'M7lc1UVf-VE',
          events: {
            'onReady': onPlayerReady,
            'onStateChange': onPlayerStateChange
          }
        });
      }
      // 4. The API will call this function when the video player is ready.
      function onPlayerReady(event) {
        console.log('ready');
        event.target.playVideo();
      }
      // 5. The API calls this function when the player's state changes.
      //    The function indicates that when playing a video (state=1),
      //    the player should play for six seconds and then stop.
      var done = false;
      function onPlayerStateChange(event) {
        console.log('change');
        if (event.data == YT.PlayerState.PLAYING && !done) {
          setTimeout(stopVideo, 6000);
          done = true;
        }
      }
      function stopVideo() {
        player.stopVideo();
      }
    </script>
  </body>
</html>