assert_class_string(object "[object MessageEvent]", "MessageEvent")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:12:5)

assert_equals("message", "message")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:13:5)

assert_false(false, "bubbles should be false")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:14:5)

assert_false(false, "cancelable should be false")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:15:5)

assert_equals("ping", "ping", "data")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:16:5)

assert_equals("", "", "origin")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:17:5)

assert_equals("", "", "lastEventId")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:18:5)

assert_equals(null, null, "source")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:19:5)

assert_array_equals([], [], "ports")
    at Test.<anonymous> ( /workers/postMessage_event_properties.htm:20:5)