document.write() obfuscation

HTML

<script>
  var d = document;
  var w = d.write;
  w.call(d, 'Hello Small World');
  
  var d = document;
	var w = d.write.bind(d);
  w('Hello World');
  
  function dw(t){document.write(t)}
  dw('Hello Grand World');
  
  document.write('test')
</script>