<!doctype html>
<head>
<style>
.a {
    height: 100px;
    background-color: lightgrey;
}
.b {
    display: block;
    border-top: 10px solid green;
    border-radius: 10px;
}

span {
    font-size: 0px;
}
</style>
</head>
<body>
<div class="a"><div class="b"></div></div>
<span>Test for crbug.com/303922: border-radius makes border not appear on empty block elements. If passes, we can see a rounded top border.</span>
</body>