CONSOLE WARNING: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/. This test checks for rdar://problem/4962298 REGRESSION: Synchronous XHR for missing local file throws exception -- breaks Wikipedia widget PASS: No exception. readyState: 4 (number) responseText: (string) responseXML: null (object) statusText: (string)