| <!DOCTYPE html> | |
| <link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color"> | |
| <style> | |
| @keyframes bgcolor { | |
| 0% { background: blue; } | |
| 100% { background: none; } | |
| } | |
| .target { | |
| animation: bgcolor 50ms; | |
| opacity: 0.9; | |
| height: 0.4px; | |
| margin: 21.6px; | |
| } | |
| </style> | |
| <div class="target"></div> |