chromium/third_party/blink/web_tests/fast/borders/empty-border-radius.html

<!doctype html>
<html>
<head>
<style>
.line {
    border-style: solid;
    border-width: 1px 0;
}

#line2 {
    border-color: green;
    border-radius: 1px;
}

span {
    font-size: 0px;
}
</style>
</head>
<body>
  <div class="line" id="line2"></div>
  <span>Test for crbug.com/303383: elements with border radius and 0px height are invisible. If this test passes, we can see a line with green color.</span>
</body>
</html>