Change Favicon

#html #javascript 
document.head || (document.head = document.getElementsByTagName('head')[0]);
 
function changeFavicon(src) {
  var link = document.createElement('link');
  var oldLink = document.getElementById('dynamic-favicon');
 
  link.id = 'dynamic-favicon';
  link.rel = 'shortcut icon';
  link.href = src;
 
  if (oldLink) {
    document.head.removeChild(oldLink);
  }
 
  document.head.appendChild(link);
}