<!doctype html>
<html>
<head>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();
setTimeout(() => {
    const stylesheet = document.querySelector('link');
    stylesheet.remove();
    if (window.testRunner)
        testRunner.notifyDone();
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<link rel="stylesheet" href="http://127.0.0.1:8000/local/resources/slow-import.css">
</head>
<body>
<h1>CAN YOU SEE ME NOW?</h1>
</body>
</html>