jQuery Safari/Chrome incompatibility with draggable containment property

<head>
    <script type="text/javascript" src="jquery.js"></script>
    <script type="text/javascript" src="jquery-ui.js"></script>
    <script>
        function newDiv() {
            var div = $('<div id="divNew" style="width: 50px; height: 50px; border: solid 1px; background: Red"></div>');
            $('#divParent').append(div);
            div.draggable(
            {
                containment: 'parent'
            });
        }
    </script>
</head>
<body>
    <a href="javascript:;" onclick="newDiv()">new div</a>
    <div id="divParent" style="width: 500px; height: 500px; border: solid 1px;"></div>
</body>

<script>
        function newDiv() {
            var divs =
              $(unescape('%3Cdiv class="divNew" style=""%3E&nbsp;%3C/div%3E'));
            divs.draggable(
            {
             containment: $('#a')
            });
    	    $('#divParent').append(divs);
       }
   </script>
</head>
<body>
    <style>
    .divNew {width: 50px; height: 50px;border: solid 1px; background: Red;}
    #divParent {width: 500px; height: 500px; border: solid 1px;};
    </style>
    <a href="javascript:;" onclick="newDiv()">new div</a>
    <div id="a">
      <div id="divParent" style=""> <!--<div class="divNew"></div>-->
      </div>
    </div>
</body>

//Draggable
		$("div.article").draggable({ helper: 'clone' });

		//Droppable box
		$("div#playlist").droppable({
			accept: "div.article",
			activeClass: 'drop-active',
			hoverClass: 'drop-hover',
			tolerance: 'touch',
			drop: function(event, ui) {
				alert("dropped");
			}
		});

if(!($browser.safari && navigator.appVersion.indexOf('Mac')!= -1)) {
    $('div.urid').draggable({
        helper: 'clone',
        opacity: 0.4
    });
}