| Test WebSocket deflate-frame extension. | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS event.data is firstMessage | |
| PASS event.data is secondMessage | |
| PASS event.data is thirdMessage | |
| onclose() was called. | |
| PASS closeEvent.wasClean is true | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |