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<html><head><script>function myFunction() { var myWindow = window.open("", "myWin", "left=700, top=350, width=200, height=100"); var winLeft = myWindow.screenLeft ? myWindow.screenLeft : myWindow.screenX; var winTop = myWindow.screenTop ? myWindow.screenTop : myWindow.screenY; myWindow.document.write("<p>This is 'myWin'"); myWindow.document.write("<br>Horizontal: " + winLeft); myWindow.document.write("<br>Vertical: " + winTop + "</p>");}</script></head><body><p>Click the button to create a new window and get the horizontal and vertical coordinates of the new window relative to the screen.</p><button onclick="myFunction()">Open "myWin"</button><p id="demo"></p></body></html>