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chromium/third_party/blink/web_tests/external/wpt/html/browsers/origin/origin-keyed-agent-clusters/resources/coep-frame.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>A page with COEP set that will respond when asked</title>

<script type="module" src="send-header-page-script.mjs"></script>