jQuery UI draggable behavior does work, but you need to update the position manually in the drag handler, as relative CSS positioning doesn't work inside SVG.
svg.rect(20,10,100,50, 10, 10, {fill:'#666'});
svg.rect(40,20,100,50, 10, 10, {fill:'#999'});
svg.rect(60,30,100,50, 10, 10, {fill:'#ccc'});
$('rect')
.draggable()
.bind('mousedown', function(event, ui){
// bring target to front
$(event.target.parentElement).append( event.target );
})
.bind('drag', function(event, ui){
// update coordinates manually, since top/left style props don't work on SVG
event.target.setAttribute('x', ui.position.left);
event.target.setAttribute('y', ui.position.top);
});
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