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chromium/third_party/blink/web_tests/http/tests/websocket/close-code-and-reason.html 

<!DOCTYPE HTML>
<script src="/js-test-resources/js-test.js"></script>
<script src="resources/close-code-and-reason-common.js"></script>
<script>
description("Test CloseEvent code and reason property.");

window.jsTestIsAsync = true;

testCloseCodeAndReason();

</script>