code: function _setAttributes(el, attrs) {
    Object.keys(attrs).forEach((key) => {
      el.setAttribute(key, attrs[key]);
    });
  }
docs: Set multiple attributes on an element, via a hash
  @param {HTMLElement|SVGElement} el The element to set the attributes on
  @param {Object} attrs A hash of key value pairs for attributes to set
  @private