| <!DOCTYPE html> |
| <html class="reftest-wait"> |
| <title>Composited scroll-linked animation with initial scroll offset</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/"> |
| <link rel="match" href="scroll-animation-initial-offset-ref.html"> |
| <style> |
| |
| #scroller { |
| overflow-y: auto; |
| height: 200px; |
| border: 2px solid green; |
| position: relative; |
| background: gray; |
| } |
| |
| .spacer { |
| height: 1000px; |
| } |
| |
| @keyframes anim { |
| 0% { transform: translateY(0); } |
| 100% { transform: translateY(800px); } |
| } |
| |
| #align { |
| box-sizing: border-box; |
| width: 100%; |
| height: 50px; |
| background: rgba(0, 0, 200, 0.2); |
| color: white; |
| position: absolute; |
| border: 1px solid white; |
| animation: anim linear 10s; |
| animation-timeline: scroll(); |
| will-change: transform; |
| } |
| |
| #marker { |
| width: 100%; |
| height: 50px; |
| background: #640; |
| position: absolute; |
| top: 350px; |
| } |
| |
| </style> |
| <div id="scroller"> |
| <div id="align">TOP</div> |
| <div class="spacer"></div> |
| <div id="marker">BOTTOM</div> |
| </div> |
| <script> |
| |
| // Test that a scroll-linked animation of a composited property reacts |
| // correctly to a programmatic scroll early during the page load. |
| // |
| // The scroll offset will change before the animation is "started" on the |
| // compositor, so it needs to be able to handle a non-zero initial offset. |
| // |
| scroller.scrollTo(0, 200); |
| |
| </script> |
| <script src="/web-animations/testcommon.js"></script> |
| <script> |
| |
| document.documentElement.addEventListener('TestRendered', async () => { |
| await waitForCompositorReady(); |
| await waitForNextFrame(); |
| await waitForNextFrame(); |
| document.documentElement.classList.remove("reftest-wait"); |
| }, { once: true }); |
| |
| </script> |
