Method background

resources/vega.min.js:14279–14283

(t)

      return this._el && this._el.firstChild;
    }
    background(t) {
      return 0 === arguments.length
        ? this._bgcolor
        : ((this._bgcolor = t), this);
    }
    resize(t, e, n, r) {
      return (
        (this._width = t),