code: function noisyRule(context, parser, onError) {
      parser.on('startTag', (name, attrs, selfClosing, location) => {
        onError({
          rule: name,
          message: getAttribute(attrs, 'message') || '',
          location,
        });
      });
    }
docs: This is a rule that reports an error for every startTag, with the ruleName equal to the startTag's name.