box-shadow-horizontal-tb-tile-edge.html

<!DOCTYPE html>
<html>
<head>
<style>
body {
    -webkit-writing-mode: horizontal-tb;
    margin-top: 231px;
}
p {
    position: absolute;
    left: 0;
    top: 0;
}
span {
    -webkit-box-shadow: 0 15px;
}
</style>
</head>
<body>
<p>Test passes if the full 15px box-shadow beneath text is visible.</p>
<span>Something Fishy</span>
</body>
</html>

chromium/third_party/blink/web_tests/fast/writing-mode/box-shadow-horizontal-tb-tile-edge.html