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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/resources/relevant/relevant.html 

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

<script>
// promise-job-incumbent will end up posting a message to here. We need to signal back the "source".

window.onmessage = e => {
  const testId = e.data;
  const sourceURL = e.source.document.URL;

  window.dispatchEvent(new CustomEvent("messagereceived", { detail: [testId, sourceURL] }));
};
</script>