| <!DOCTYPE html> |
| <title>CSS Animation using progress based timeline</title> |
| <link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/web-animations/testcommon.js"></script> |
| <style> |
| main > div { |
| overflow: hidden; |
| width: 100px; |
| height: 100px; |
| } |
| main > div > div { |
| height: 200px; |
| } |
| |
| @keyframes top { |
| from { top: 100px; } |
| to { top: 200px; } |
| } |
| |
| @scroll-timeline top_timeline { |
| source: selector(#scroller1); |
| } |
| |
| #element { |
| animation-name: top; |
| animation-duration: 10s; |
| animation-timing-function: linear; |
| animation-timeline: top_timeline; |
| } |
| /* Ensure stable expectations if feature is not supported */ |
| @supports not (animation-timeline:foo) { |
| #element { animation-play-state: paused; } |
| } |
| </style> |
| <main> |
| <div id=scroller1><div></div></div> |
| <div id=element></div> |
| </main> |
| <script> |
| // Force layout of scrollers. |
| scroller1.offsetTop; |
| |
| scroller1.scrollTop = 20; |
| |
| promise_test(async (t) => { |
| await waitForNextFrame(); |
| assert_equals(getComputedStyle(element).top, '120px'); |
| }, 'progress based animation timeline works'); |
| |
| </script> |
