vertOnSpill: false,              // spilling will put the element back where it was dragged from, if this is true
            removeOnSpill: false,              // spilling will `.remove` the element, if this is true
            mirrorContainer: document.body,    // set the element that gets mirror elements appended
            ignoreInputTextSelection: true     // allows users to select input text, see details below
        }).on('drop', function (el, target, source, sibling) {
            var $target     