| <body style="background-color: red"> | |
| <script> | |
| const reversedAnimation = () => { | |
| const animation = document.body.animate({ backgroundColor: ["green", "green"] }, 1); | |
| animation.reverse(); | |
| return animation; | |
| } | |
| (async function () { | |
| await reversedAnimation().finished; | |
| await new Promise(setTimeout); | |
| await reversedAnimation().ready; | |
| window.top.postMessage("PASS", "*"); | |
| })(); | |
| </script> | |
| </body> |