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/.
CONSOLE ERROR: line 20: Uncaught RangeError: Maximum call stack size exceeded.
CONSOLE ERROR: line 21: Uncaught RangeError: Maximum call stack size exceeded.
This tests that having infinite recursion in XMLHttpRequest event handler does not crash. 
PASS