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chromium/third_party/blink/web_tests/external/wpt/wasm/jsapi/functions/resources/incumbent-incumbent.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Incumbent page used as a test helper</title>

<script src="/wasm/jsapi/wasm-module-builder.js"></script>
<script src="/wasm/jsapi/functions/helper.js"></script>

<iframe src="relevant/relevant.html" id="r"></iframe>
<iframe src="current/current.html" id="c"></iframe>

<script>
const relevant = document.querySelector("#r");
const current = document.querySelector("#c");

window.runWindowPostMessageVeryIndirectly = (...args) => {
  return current.contentWindow.postMessage.call(relevant.contentWindow, ...args);
};

// This tests the backup incumbent settings object stack scenario, by avoiding putting user code on the stack.
window.runWindowPostMessageVeryIndirectlyWithNoUserCode = (...args) => {
  const runWindowPostMessage = current.contentWindow.postMessage.bind(relevant.contentWindow, ...args);
  call_later(runWindowPostMessage);
};
</script>