| Yi Gu | b250a8d | 2020-03-13 23:08:31 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <title>Scroll timeline with Web Animation using a scroller with overflow hidden</title> |
| 3 | <style> |
| 4 | #box { |
| 5 | width: 100px; |
| 6 | height: 100px; |
| 7 | background-color: green; |
| 8 | transform: translate(0, 100px); |
| 9 | opacity: 0.5; |
| 10 | will-change: transform; /* force compositing */ |
| 11 | } |
| 12 | |
| 13 | #covered { |
| 14 | width: 100px; |
| 15 | height: 100px; |
| 16 | background-color: red; |
| 17 | } |
| 18 | |
| 19 | #scroller { |
| 20 | overflow: hidden; |
| 21 | height: 100px; |
| 22 | width: 100px; |
| 23 | will-change: transform; /* force compositing */ |
| 24 | } |
| 25 | |
| 26 | #contents { |
| 27 | height: 1000px; |
| 28 | width: 100%; |
| 29 | } |
| 30 | </style> |
| 31 | |
| 32 | <div id="box"></div> |
| 33 | <div id="covered"></div> |
| 34 | <div id="scroller"> |
| 35 | <div id="contents"></div> |
| 36 | </div> |
| 37 | |
| 38 | <script> |
| 39 | window.addEventListener('load', function() { |
| 40 | // Move the scroller to halfway. |
| 41 | const scroller = document.getElementById("scroller"); |
| 42 | const maxScroll = scroller.scrollHeight - scroller.clientHeight; |
| 43 | scroller.scrollTop = 0.5 * maxScroll; |
| 44 | }); |
| 45 | </script> |
