| <!DOCTYPE html> | |
| <body> | |
| <script> | |
| document.body.attachShadow({ mode: 'open' }).innerHTML = | |
| `<style> | |
| div::after { | |
| display: inline-block; | |
| content: 'Hello world!'; | |
| animation: spin 1s infinite; | |
| } | |
| @keyframes spin { | |
| from { transform: rotate(180deg) } | |
| to { transform: rotate(180deg) } | |
| } | |
| </style> | |
| <div></div>` | |
| </script> |