chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/font-size-adjust-reload.html

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<link rel="author" title="Vitor Roriz" href="https://github.com/vitorroriz">
<link rel="help" href="http://www.w3.org/TR/css-fonts-3/#font-size-adjust-prop">
<link rel="match" href="font-size-adjust-reload-ref.html">
<style>
body {
    margin: 0;
    padding: 0;
}
iframe {
    border: 0;
    width: 400px;
    height: 400px;
}
</style>
</head>
<body>
    <script>
        let loadCount = 0;
        const iframe = document.createElement("iframe");
        iframe.addEventListener("load", function() {
            if (loadCount == 2) {
                document.documentElement.classList.remove("reftest-wait");
                return;
            }
            iframe.contentWindow.location.reload();
            loadCount++;
        });
        iframe.src = "font-size-adjust-reload-ref.html";
        document.body.append(iframe);
    </script>
</body>
</html>