<?php
header("Access-Control-Allow-Origin: *");
header('Access-Control-Allow-Methods: GET, POST');
?>
this is itest
<div style="height:1100px; background-color:pink; width:100px" >sdfsd</div>
<a href="javascript:;" onclick="goTop()">Go to Top</a>
<script>
function goTop () {
  parent.scrollTo(0,0);
}
</script>

<iframe src="http://serverA.com/server.php" height="1200px" >