| <!DOCTYPE html> | |
| <meta charset="UTF-8"> | |
| <title>Empty ruby text container</title> | |
| <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org"> | |
| <div style="font-size: 64px; line-height: 5">a<ruby><rb>b</rb><rtc><rt></rt></rtc><rt>c</rt></ruby>d</div> |