| <!DOCTYPE html> |
| <html> |
| <head> |
| <link rel="stylesheet" href="../empty-style.css"> |
| <script> |
| const executed_during_prerendering = document.prerendering; |
| // Encode `document.prerendering` into the beacon URL so the test can |
| // distinguish "script resumed during prerendering (upgrade worked)" from |
| // "script only resumed after activation". The test asserts that the |
| // `prerendering=true` variant fires. |
| navigator.sendBeacon( |
| `/iframe-beacon?prerendering=${executed_during_prerendering}`, ""); |
| </script> |
| </head> |
| <body> |
| </body> |
| </html> |
