| <!DOCTYPE html> |
| <html class="reftest-wait"> |
| <link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color"> |
| <link rel="match" href="background-color-animation-will-change-contents-ref.html"> |
| <style> |
| .container { |
| width: 600px; |
| height: 600px; |
| will-change: contents; |
| /* Start with a short delay and ensure that we pick up the color change when |
| the animation enters the active phase. */ |
| animation: bgcolor 10s steps(1, jump-start) backwards 0.2s; |
| } |
| @keyframes bgcolor { |
| 0% { background-color: rgba(200, 0, 0, 1); } |
| 100% { background-color: rgba(0, 200, 0, 1); } |
| } |
| </style> |
| <script src="/common/reftest-wait.js"></script> |
| <body> |
| <div class="container"></div> |
| |
| <script> |
| function waitForActiveAnimation() { |
| const anim = document.getAnimations()[0]; |
| return new Promise(resolve => { |
| const tick = () => { |
| requestAnimationFrame(() => { |
| if (anim.currentTime > 200) |
| resolve(); |
| else |
| tick(); |
| }); |
| }; |
| tick(); |
| }); |
| } |
| |
| window.onload = async () => { |
| await waitForActiveAnimation(); |
| takeScreenshot(); |
| }; |
| </script> |
| </body> |
| </html> |