Channel_postMessage_transfer_xsite_incoming_messages.window.js

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This WPT test may be referenced by the following Test IDs:
- /webmessaging/Channel_postMessage_transfer_xsite_incoming_messages.window.html - WPT Dashboard Interop Dashboard

// META: script=/common/get-host-info.sub.js

async_test(function(t) {

  var channel1 = new MessageChannel();

  var host = get_host_info();

  let iframe = document.createElement('iframe');

  iframe.src = host.HTTP_NOTSAMESITE_ORIGIN + "/webmessaging/support/ChildWindowPostMessage.htm";

  document.body.appendChild(iframe);

  var TARGET = document.querySelector("iframe").contentWindow;

  iframe.onload = t.step_func(function() {

    // Enable the port.

    channel1.port1.onmessage = t.step_func(function (evt) {

      assert_equals(Number(evt.data), 0);

      // Send a message, expecting it to be received in the iframe.

      channel1.port2.postMessage(1)

      // Transfer the port.

      TARGET.postMessage("ports", "*", [channel1.port1]);

});

    // Send a message, expecting it to be received here.

    channel1.port2.postMessage(0)

    channel1.port2.onmessage = t.step_func(function (evt) {

        assert_equals(Number(evt.data), 1);

        t.done();

});

});

}, `Tasks enqueued on the port-message-queue of an enabled port,

  are transferred along with the port, when the transfer happens in the same task

  during which postMessage is called`);