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)