| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| .background { |
| position: absolute; |
| top: 50px; |
| left: 50px; |
| width: 140px; |
| height: 140px; |
| background: blue; |
| will-change: transform; |
| } |
| |
| .container { |
| position: absolute; |
| top: 100px; |
| left: 100px; |
| height: 500px; |
| width: 500px; |
| padding: 10px; |
| background-color: orange; |
| } |
| |
| .content { |
| height: 200px; |
| background-color: rgba(255, 255, 255, 0.5); |
| } |
| |
| .fade-in { |
| animation-name: fade-in; |
| animation-duration: 50ms; |
| } |
| |
| @keyframes fade-in { |
| from { opacity: 1 } |
| to { opacity: 1 } |
| } |
| |
| .fade-out { |
| margin: 50px; |
| animation-name: fade-out; |
| animation-duration: 10s; |
| } |
| |
| @keyframes fade-out { |
| from { opacity: 1 } |
| to { opacity: 1 } |
| } |
| </style> |
| </head> |
| <body> |
| <div class="background">fixed</div> |
| <div class="container"> |
| container |
| <div class="content fade-in">fader</div> |
| </div> |
| <script> |
| |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| document.querySelector(".content").addEventListener("animationend", event => { |
| setTimeout(() => { |
| event.target.classList.remove("fade-in"); |
| event.target.classList.add("fade-out"); |
| |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }); |
| }, { once: true }); |
| |
| </script> |
| </body> |
| </html> |
