<form onsubmit="event.preventDefault(); displayFavicon();">

  <input type="text" id="fieldval" autocomplete="off" placeholder="eg: gopi blog tech.com"/>

  <button>Grab</button>

</form>

<span id="result"></span>

<script>

   function displayFavicon() {

   var link = document.getElementById("fieldval").value;

   var imglink = "https://www.google.com/s2/favicons?domain=" + link;

   var img = "<img src='"+imglink+"' />";

   document.getElementById("result").innerHTML = img;

 };

</script>