css/css-ruby/ruby-bidi-004.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Ruby test: dir=rtl on rb and rt elements</title>
<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#bidi">
<link rel="match" href="ruby-bidi-004-ref.html">
<style>
div { font-size: 50px; }
rb, rt, span { unicode-bidi: isolate; }
</style>
<p>All three examples should look the same:</p>

<div>
 <p>
  <ruby dir=rtl>&#x6F1; &#x6F2; &#x6F3;<rt>1 2 3</rt></ruby>
 </p>

 <p>
  <ruby><span dir=rtl>&#x6F1; &#x6F2; &#x6F3;</span><rt dir=rtl>1 2 3</rt></ruby>
 </p>

 <p>
  <ruby><rb dir=rtl>&#x6F1; &#x6F2; &#x6F3;</rb><rt dir=rtl>1 2 3</rt></ruby>
 </p>
</div>