| <!DOCTYPE html> | |
| <meta charset="UTF-8"> | |
| <title>Line break suppression on whitespaces wrapped but not contained in ruby boxes</title> | |
| <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org"> | |
| <link rel="author" title="Mozilla" href="https://www.mozilla.org"> | |
| <span style="white-space: pre"><rb>a</rb><rb> | |
| </rb><rb>b</rb></span> |