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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/variations/variable-box-font-ref.html 

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<style>
    @font-face {
    font-family: variabletest_box;
    src: url(resources/variabletest_box.ttf);
    }

    body {
    font-family: variabletest_box, sans-serif;
    font-size: 200px;
    }
</style>
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<script>
    document.fonts.ready.then(
        () => { document.documentElement.classList.remove("reftest-wait"); });
</script>