drag and drop in html5

This is example for how to drag and drop in html5
<!DOCTYPE HTML>
<html>
<head>
    <style type="text/css">
        #div1{width:250px; height:200px; padding:10px; border:1px solid red;}
    </style>
    <script type="text/javascript">
        function allowDrop(event)
        {
		    event.preventDefault();
        }
        function drag(event)
        {
            event.dataTransfer.setData("Text", event.target.id);
        }
        function drop(event)
        {
            event.preventDefault();
            var data = event.dataTransfer.getData("Text");
            event.target.appendChild(document.getElementById(data));
        } 
    </script>
</head>
<body>
    <p>You can drag image to rect area</p>
    <div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
    <img id="drag1" src="images/pic/German.jpg" draggable="true" ondragstart="drag(event)" width="200" height="200">
</body>
</html> 

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