Function rv

resources/vega.min.js:14140–14150

(t, e, n, r)

      if (n[r].tagName.toLowerCase() === e) return n[r];
  }
  function rv(t, e, n, r) {
    var i,
      o = t.childNodes[e];
    return (
      (o && o.tagName.toLowerCase() === n.toLowerCase()) ||
        ((i = o || null),
        (o = ev(t.ownerDocument, n, r)),
        t.insertBefore(o, i)),
      o
    );
  }
  function iv(t, e) {
    for (var n = t.childNodes, r = n.length; r > e; ) t.removeChild(n[--r]);
    return t;