Facebook Instagram headers checker

<iframe width="1100" height="200" allowtransparency="true" frameborder="0" id="9f302b" scrolling="no" src="https://bailey.sh/seostudio/demo/standard/embed.php?id=headers&h=0&r=9f302b"></iframe>

<script type="text/javascript">

  (function(id) {

    var eventMethod = (window.addEventListener ? "addEventListener" : "attachEvent"), lh = -1;

    window[eventMethod](eventMethod == "attachEvent" ? "onmessage" : "message", function(e) {

      if (e.data.indexOf(id + ':') != 0) return; var h = parseInt(e.data.substring(id.length + 1), 10);

      if (lh != h) document.getElementById(id).style.height = h + 'px'; lh = h;

    }, false);

  })("9f302b");

</script>