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<!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>