| <!DOCTYPE HTML> |
| <html class="reftest-wait"> |
| <title>The default scroll-timeline at rule</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-timeline-at-rule"> |
| <link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-timeline"> |
| <meta name="assert" content="CSS animation correctly updates values when using the default scroll-timeline at rule"> |
| <link rel="match" href="at-scroll-timeline-default-descriptors-ref.html"> |
| |
| <style> |
| @keyframes update { |
| from { transform: translateY(0px); } |
| to { transform: translateY(200px); } |
| } |
| |
| @scroll-timeline test-timeline { |
| source: auto; |
| orientation: auto; |
| scroll-offsets: none; |
| } |
| |
| html { |
| min-height: 100%; |
| padding-bottom: 100px; |
| } |
| |
| #box { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| animation: update 1s linear; |
| animation-timeline: test-timeline; |
| } |
| |
| #covered { |
| width: 100px; |
| height: 100px; |
| background-color: red; |
| } |
| |
| * { |
| margin-top: 0px; |
| margin-bottom: 0px; |
| } |
| </style> |
| |
| <div id="box"></div> |
| <div id="covered"></div> |
| |
| <script> |
| window.addEventListener('load', function() { |
| const scroller = document.scrollingElement; |
| |
| // Move the scroller to the halfway point. |
| const maxScroll = scroller.scrollHeight - scroller.clientHeight; |
| scroller.scrollTop = 0.5 * maxScroll; |
| |
| window.requestAnimationFrame(() => { |
| document.documentElement.classList.remove("reftest-wait"); |
| }); |
| }); |
| </script> |
