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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-radius-css-text.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Backgrounds and Borders Module Level 3: border-radius in cssText</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#border-radius">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="test"></div>
<script>
test(() => {
    const element = document.getElementById("test");
    assert_equals(element.style.cssText, "", "cssText is initially empty");

    element.style.borderRadius = "10px";
    assert_equals(element.style.cssText, "border-radius: 10px;");

    element.style.borderTopLeftRadius = "20px";
    assert_equals(element.style.cssText, "border-radius: 20px 10px 10px;");

    element.style.borderBottomLeftRadius = "30px";
    assert_equals(element.style.cssText, "border-radius: 20px 10px 10px 30px;");
}, "Setting border-radius does not expand to longhand properties in cssText.");
</script>
</body>
</html>