Function getParentOrHost

Sortable.js:161–163

(el)

    return false;
  }
  function getParentOrHost(el) {
    return el.host && el !== document && el.host.nodeType && el.host !== el ? el.host : el.parentNode;
  }
  function closest( /**HTMLElement*/el, /**String*/selector, /**HTMLElement*/ctx, includeCTX) {
    if (el) {
      ctx = ctx || document;