| <html class="reftest-wait"> |
| <title>Scroll timeline with Web Animation using a scroller with overflow hidden</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations/"> |
| <meta name="assert" content="Web animation correctly updates values when using a overflow: hidden on the scroller being used as the source for the ScrollTimeline"> |
| <link rel="match" href="animation-with-overflow-hidden-ref.html"> |
| |
| <script src="/web-animations/testcommon.js"></script> |
| <script src="/common/reftest-wait.js"></script> |
| |
| <style> |
| #box { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| } |
| |
| #covered { |
| width: 100px; |
| height: 100px; |
| background-color: red; |
| } |
| |
| #scroller { |
| overflow: hidden; |
| height: 100px; |
| width: 100px; |
| } |
| |
| #contents { |
| height: 1000px; |
| width: 100%; |
| } |
| </style> |
| |
| <div id="box"></div> |
| <div id="covered"></div> |
| <div id="scroller"> |
| <div id="contents"></div> |
| </div> |
| |
| <script> |
| const box = document.getElementById('box'); |
| const effect = new KeyframeEffect(box, |
| [ |
| {transform: 'translateY(0)', opacity: 1}, |
| {transform: 'translateY(200px)', opacity: 0} |
| ], { |
| duration: 1000, |
| } |
| ); |
| |
| const scroller = document.getElementById('scroller'); |
| const timeline = new ScrollTimeline({ scrollSource: scroller, timeRange: 1000, orientation: 'block' }); |
| const animation = new Animation(effect, timeline); |
| animation.play(); |
| |
| animation.ready.then(() => { |
| // Move the scroller to the halfway point. |
| const maxScroll = scroller.scrollHeight - scroller.clientHeight; |
| scroller.scrollTop = 0.5 * maxScroll; |
| waitForAnimationFrames(2).then(_ => { |
| takeScreenshot(); |
| }); |
| }); |
| </script> |
