Function scrollBy

Sortable.js:497–500

(el, x, y)

    _throttleTimeout = void 0;
  }
  function scrollBy(el, x, y) {
    el.scrollLeft += x;
    el.scrollTop += y;
  }
  function clone(el) {
    var Polymer = window.Polymer;
    var $ = window.jQuery || window.Zepto;