This test checks whether various forms of assignment expression are allowed. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS x = 1; x is 1 PASS window.x = 2; x is 2 PASS window["x"] = 3; x is 3 PASS (x) = 4; x is 4 PASS (window.x) = 5; x is 5 PASS (window["x"]) = 6; x is 6 PASS y, x = 7; x is 7 PASS ((x)) = 8; x is 8 PASS ((window.x)) = 9; x is 9 PASS ((window["x"])) = 10; x is 10 PASS (y, x) = "FAIL"; threw exception ReferenceError: Left side of assignment is not a reference.. PASS (true ? x : y) = "FAIL"; threw exception ReferenceError: Left side of assignment is not a reference.. PASS x++ = "FAIL"; threw exception SyntaxError: Parse error. PASS successfullyParsed is true TEST COMPLETE