<!DOCTYPE html>
<html>
<head>
    <style type="text/css">
        @media (orientation: landscape) {
            body:before {
                content: "landscape";
            }
        }
        
        @media (orientation: portrait) {
            body:before {
                content: "portrait";
            }
        }
    </style>
</head>
<body>
    <textarea></textarea>
    <script type="text/javascript">
        if (!window.eventSender)
            return;

        var textArea = document.getElementsByTagName("textarea")[0];
        var x = textArea.offsetLeft + textArea.offsetWidth / 2;
        var y = textArea.offsetTop + textArea.offsetHeight / 2;
        eventSender.mouseMoveTo(x, y);
        eventSender.mouseDown();
        eventSender.mouseUp();
    </script>
</body>
</html>