<!DOCTYPE html>
<html>
<body>
<p>Click the button to open a new window called "MsgWindow" with some text.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var myWindow = window.open("", "MsgWindow", "width=200,height=100");
myWindow.document.write("<p>This is 'MsgWindow'. I am 200px wide and 100px tall!</p>");
}
</script>
</body>
</html>