For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
```js
var editableList = new Sortable(list, {
filter:".js-remove,.js-edit",
onFilter:function (evt) {
var el = editableList.closest(evt.target); // list item
if (editableList.closest(evt.item, ".js-remove")) { // Click on remove button