[cts.https.html?q=webgpu:api,operation,buffers,map_ArrayBuffer:postMessage:*]
  implementation-status: backlog
  expected:
    if os == "linux" and debug: [OK, TIMEOUT]
  [:transfer=false;mapMode="READ"]
    expected:
      if os == "win": FAIL
      if os == "linux" and debug: [FAIL, TIMEOUT, NOTRUN]
      if os == "linux" and not debug: FAIL
      if os == "mac": FAIL

  [:transfer=false;mapMode="WRITE"]
    expected:
      if os == "win" and debug: [PASS, FAIL]
      if os == "linux" and debug: [PASS, TIMEOUT, NOTRUN]

  [:transfer=true;mapMode="READ"]
    expected:
      if os == "win": FAIL
      if os == "linux" and debug: [FAIL, TIMEOUT, NOTRUN]
      if os == "linux" and not debug: FAIL
      if os == "mac": FAIL

  [:transfer=true;mapMode="WRITE"]
    expected:
      if os == "win": FAIL
      if os == "linux" and debug: [FAIL, TIMEOUT, NOTRUN]
      if os == "linux" and not debug: FAIL
      if os == "mac": FAIL
