Verify that scripts running in a detached window can still modify global properties

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS () => foo is 2
PASS () => globalThis[0] is undefined
PASS iframeContentWindow.foo is 2
PASS iframeContentWindow[0] is undefined
PASS successfullyParsed is true

TEST COMPLETE