| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <style> |
| iframe { |
| width: 400px; |
| height: 400px; |
| } |
| </style> |
| </head> |
| <body> |
| <iframe frameBorder="none"></iframe> |
| <script> |
| doneLoadingSubframe = false; |
| addEventListener("load", () => { |
| let iframe = document.querySelector("iframe"); |
| iframe.addEventListener("load", () => doneLoadingSubframe = true); |
| iframe.srcdoc = ` |
| <html> |
| <head> |
| <style> |
| body, html { |
| margin: 0; |
| } |
| |
| img { |
| display: block; |
| margin-top: 8000px; |
| } |
| </style> |
| </head> |
| <body> |
| <img src='400x400-green.png' /> |
| <script> |
| addEventListener('load', () => scrollBy(0, 10000)); |
| </script` + `> |
| </body> |
| </html> |
| `; |
| }); |
| </script> |
| </body> |
| </html> |
