This page has loaded without a query string. Now click here to pass a query string which will be reflected in the body and cause the browser's XSS defence to fire. Watch the developer tools to see the browser submit the report (ensure "Preserve log" is checked). In Chrome, you'll also see a generic browser error page and the text "ERR_BLOCKED_BY_XSS_AUDITOR".
This demonstrates how you can receive reports from your site when the XSS auditor fires.