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chromium/third_party/blink/web_tests/external/wpt/webmessaging/postMessage_cross_domain_image_transfer_2d.sub.htm 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<body>
<script>
// Create a 2D canvas filled in solid gray.
var size = 4;
var sourceCanvas = document.createElement('canvas');
sourceCanvas.width = sourceCanvas.height = size;
var ctx = sourceCanvas.getContext('2d');
ctx.fillStyle = "gray";
ctx.fillRect(0, 0, size, size);
const expectedPixels = "{\"0\":128,\"1\":128,\"2\":128,\"3\":255,\"4\":128,\"5\":128,\"6\":128,\"7\":255,\"8\":128,\"9\":128,\"10\":128,\"11\":255,\"12\":128,\"13\":128,\"14\":128,\"15\":255,\"16\":128,\"17\":128,\"18\":128,\"19\":255,\"20\":128,\"21\":128,\"22\":128,\"23\":255,\"24\":128,\"25\":128,\"26\":128,\"27\":255,\"28\":128,\"29\":128,\"30\":128,\"31\":255,\"32\":128,\"33\":128,\"34\":128,\"35\":255,\"36\":128,\"37\":128,\"38\":128,\"39\":255,\"40\":128,\"41\":128,\"42\":128,\"43\":255,\"44\":128,\"45\":128,\"46\":128,\"47\":255,\"48\":128,\"49\":128,\"50\":128,\"51\":255,\"52\":128,\"53\":128,\"54\":128,\"55\":255,\"56\":128,\"57\":128,\"58\":128,\"59\":255,\"60\":128,\"61\":128,\"62\":128,\"63\":255}";

const {ORIGIN, REMOTE_ORIGIN, HTTP_NOTSAMESITE_ORIGIN} = get_host_info();
for (let origin of [ORIGIN, REMOTE_ORIGIN, HTTP_NOTSAMESITE_ORIGIN]) {
  promise_test(async t => {
    let imageBitmap = await createImageBitmap(sourceCanvas);

    let frame = document.createElement('iframe');
    frame.src = origin + '/webmessaging/support/cross-domain-image-receive.htm';
    document.body.appendChild(frame);
    await new Promise(resolve => { frame.onload = e => resolve(); });

    frame.contentWindow.postMessage({image: imageBitmap}, "*", [imageBitmap]);
    let reply = await new Promise(resolve => {
      window.addEventListener('message', e => resolve(e.data), {once: true});
    });
    assert_equals(reply, expectedPixels);
  }, `sending 2D canvas ImageBitmap to ${origin}`);
}
</script>
</body>