chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/request-encoding4.html

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Test for <a href="http://crbug.com/277526">http://crbug.com/277526</a>:
XMLHttpRequest normalizes the data sent to the server into Unicode NFC.</p>
<iframe id="frame" src="resources/request-encoding4-doc.html" onload="onFrameLoaded()"></iframe>
<div id="result">FAIL: script didn't run to completion.</div>
<script>

    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    function onFrameLoaded() {
        var xhr = new XMLHttpRequest;
        xhr.open("POST", "resources/post-echo-as-utf-8.cgi", false);
        xhr.setRequestHeader("content-type", "text/html; charset=UTF-8");
        xhr.send(document.getElementById("frame").contentDocument);
        if (xhr.responseText == "<html><head><meta http-equiv=\"content-type\" content=\"text/html; charset=UTF-8\"></head><body>n\u0303</body></html>")
            document.getElementById("result").firstChild.data = "SUCCESS";
        else
            document.getElementById("result").firstChild.data = "FAILURE: '" + xhr.responseText + "'";

        document.body.removeChild(document.getElementById("frame"));

        if (window.testRunner)
            testRunner.notifyDone();
    }

</script>
</body>
</html>