code: function runHtmlCodeSniffer() {
  			return new Promise((resolve, reject) => {
  				window.HTMLCS.process(options.standard, window.document, error => {
  					if (error) {
  						return reject(error);
  					}
  					resolve(window.HTMLCS.getMessages());
  				});
  			});
  		}
docs: Run HTML CodeSniffer on the current page.
  @private
  @returns {Promise} Returns a promise which resolves with HTML CodeSniffer issues.