<!DOCTYPE html>
<html>
<head>
<script>
function openWin() {
var myWindow = window.open("", "", "width=400, height=200");
myWindow.opener.document.getElementById("demo").innerHTML =
"A new window has been opened.";
}
</script>
</head>
<body>
<button onclick="openWin()">Open myWindow</button>
<p id="demo"></p>
</body>
</html>