<!DOCTYPE html>
<meta charset="UTF-8">
<title>Bidirectional text inside ruby content box</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<body dir="rtl" style="font-size: 64px">
<ruby><div>אב12ג</div><rt><div>אabבג</div></ruby>