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chromium/third_party/blink/web_tests/external/wpt/client-hints/service-workers/navigation-preload.https.html 

<!DOCTYPE html>
<title>Client Hint/Service Worker interaction</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script src="resources/util.js"></script>
<script>
promise_test((t) =>
  ch_sw_test(t, 'resources/navigation-preload.js', 'resources/echo-hint-in-html.py', 'PASS'),
  "Service worker successfully passes hints through to new fetch");
</script>