code: function _addMetasToDoc($, metaList) {
      if (!_.isArray(metaList) || metaList.length === 0) return;
      const $head = $('head');
      let lastMeta;
      const existingMetas = $head.find('meta');
      if (existingMetas.length > 0) {
          lastMeta = existingMetas.eq(existingMetas.length - 1);
      } else {
          lastMeta = HtmlParser.DOM.N_TAB + HtmlParser.DOM.getMetaElem(metaList[0]);
          lastMeta = $head.prepend(lastMeta).find('meta');
          metaList.shift(); // remove first
      }
      metaList.forEach(metaInfo => {
          const meta = HtmlParser.DOM.N_TAB + HtmlParser.DOM.getMetaElem(metaInfo);
          lastMeta = $(meta).insertAfter(lastMeta);
      });
  }
docs: -------------------------------- HELPER METHODS -------------------------------- 
  Adds the given meta list to the current document of the given jQuery
  instance.
  @private
  
  @param {jQuery} $ - jQuery instance.
  @param {Array} metaList - List of arbitrary meta objects.