css/css-writing-modes/writing-mode-vlr-forms-002-manual.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>writing mode:vertical-lr, input type=text placeholder</title>
<link rel="author" title="Richard Ishida" href="mailto:ishida@w3.org"/>
<link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#block-flow"/>
<meta name="assert" content="writing-mode:vertical-lr will display an input field for text vertically, and with vertical placeholder text inside."/>
<style type="text/css">
@font-face {
    font-family: 'webfont';
    src: 	url('/fonts/noto/NotoSansMongolian-regular.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
	}
input { font-family: webfont; font-size: 34px; }
</style>
<!-- this is the test -->
<style type="text/css">
.test { writing-mode: vertical-lr; }
</style>
</head>
<body>
<p class="instructions">Test passes if the input field is vertical and the text inside it has default vertical settings.</p>
<div class="test">
<input type="text" placeholder="ᠮᠤᠩᠭᠤᠯ W3C i18n ᠤᠯᠤᠰ" />
</div>
</body>
</html>