chromium/third_party/blink/web_tests/fast/css/focus-ring-multiline-writingmode-vertical.html

<html>
<head>
<script>
window.onload = function()
{
    document.getElementById("multiline").focus();
}
</script>
</head>
<body>
<div id="multiline" style="-webkit-writing-mode: vertical-rl; width: 10em; height: 10em;" contenteditable>
Assuming the port-specific theme draws focus rings, this test draws focus rings around editable multiline text in vertical writing mode.
</div>
</body>
</html>