child window not closing

I am trying to close a child window from javascript but it is not working.

var childWnd;

function openwin(theURL,winName,features)
{
childWnd=window.open(theURL,winName,features);
childWnd.moveTo(400,220);
}

function closeWindow(){
if (childWnd && childWnd.open && !childWnd.closed){
alert(‘closed’);
childWnd.close();
}
else
alert(‘not opened’);
}

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