code: function selectorTagNameSpy(results, tagName) {
          var context = phantomas.getDOMPath(this);
  
          // querying by BODY and body is the same (issue #419)
          tagName = tagName.toLowerCase();
  
          phantomas.incrMetric('DOMqueriesByTagName');
          phantomas.addOffender('DOMqueriesByTagName', {tag: tagName, node: phantomas.getDOMPath(this)});
          querySpy('tag name', tagName, 'getElementsByTagName', context, (results.length === 0));
      }
docs: selectors by tag name