Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Open "myWindow" and move the new window to the top left corner of the screen:</p>

<button onclick="openWin()">Open "myWindow"</button>
<button onclick="moveWin()">Move "myWindow"</button>

<script>
var myWindow;

function openWin() {
    myWindow=window.open("", "myWindow", "width=200, height=100");
    myWindow.document.write("<p>This is 'myWindow'</p>");
}

function moveWin() {
    myWindow.moveTo(500, 100);
    myWindow.focus();
}
</script>

</body>
</html>