This is a testharness.js-based test.
FAIL postMessaging to this window does not give back the same SharedArrayBuffer (but does use the same backing block) SharedArrayBuffer is not defined
FAIL postMessaging to a worker and back does not give back the same SharedArrayBuffer SharedArrayBuffer is not defined
FAIL postMessaging to an iframe and back does not give back the same SharedArrayBuffer SharedArrayBuffer is not defined
Harness: the test ran to completion.

