chromium/third_party/blink/web_tests/http/tests/misc/prefetch-purpose.html

<html>
<head>
<script>

function finishUp() {
    window.location = 'resources/prefetch-purpose.php';
}

if (window.testRunner) {
    testRunner.waitUntilDone();
    testRunner.dumpAsText();
}
</script>
<link href="resources/prefetch-purpose.php" rel="prefetch" onload="finishUp()">
</head>
<body>
<p>Nothing to see here, this page should replace itself with resources/prefetch-purpose.php almost instantly.
</body>
</html>