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chromium/third_party/blink/web_tests/fast/performance/nav-timing-file-url.html 

<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<script>

description("This tests that navigation timing entries don't require HTTP.");

const entries = performance.getEntriesByType("navigation");
shouldBe('entries.length', '1');
shouldBe('entries[0].name', 'document.URL');
shouldBe('new URL(entries[0].name).protocol', '"file:"');
</script>