Function nv

resources/vega.min.js:14135–14139

(t, e)

    );
  }
  function nv(t, e) {
    e = e.toLowerCase();
    for (var n = t.childNodes, r = 0, i = n.length; r < i; ++r)
      if (n[r].tagName.toLowerCase() === e) return n[r];
  }
  function rv(t, e, n, r) {
    var i,
      o = t.childNodes[e];