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BOM window Objects in javascript

 <html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BOM Window Objects</title>
   
</head>
<body>
    <h1>BOM Window Objects</h1>
    <button onclick="openWindow()">Open Window</button>
    <button onclick="resizeToWindow()">Resize To Window</button>
    <button onclick="resizeByWindow()">Resize By Window</button>
    <button onclick="closeWindow()">Close Window</button>
    <script>
        var mywindow;
        function openWindow(){
            mywindow=window.open('','','width=400px,height=200px,left=60px,top=40px');
            mywindow.document.write('<p>This is paragraph</p>')
        }

        function resizeToWindow(){
            // it will resize window to given with and height
            mywindow.resizeTo(300,300);
        }

        function resizeByWindow(){
            // it will resize window relative to the existing width and height,(it
            will add width and height to the existing width and height of the window).
            // 100+400 = 250px
            mywindow.resizeBy(400,400);
        }

        function closeWindow(){
            mywindow.close();
        }
    </script>
</body>
</html>

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