| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>CSS Reference: A green box</title> | |
| <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org"> | |
| <link rel="author" title="Mozilla" href="https://www.mozilla.org"> | |
| <p>Pass if there is NO red below:</p> | |
| <div id="ref" style="width: 100px; height: 100px; background: green"></div> |