| <!DOCTYPE html> |
| <html class="reftest-wait"> |
| <title>Tests that anchored element should update location after scroll offset changes caused by scroll content resizing</title> |
| <link rel="author" href="mailto:xiaochengh@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/"> |
| <link rel="match" href="reference/anchor-scroll-update-006-ref.html"> |
| <style> |
| #cb { |
| position: absolute; |
| inset: 0; |
| } |
| #scroller { |
| margin-top: 300px; |
| overflow-y: scroll; |
| height: 100px; |
| } |
| #spacer { height: 400px; } |
| #spacer.changed { height: 300px; } |
| #anchor { anchor-name: --a; } |
| #anchored { |
| position: absolute; |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| top: anchor(--a top); |
| left: 0; |
| position-anchor: --a; |
| } |
| </style> |
| <div id="cb"> |
| <div id="scroller"> |
| <div id="anchor"></div> |
| <div id="spacer"></div> |
| </div> |
| <div id="anchored"></div> |
| </div> |
| <script> |
| function raf() { |
| return new Promise(resolve => requestAnimationFrame(resolve)); |
| } |
| |
| async function runTest() { |
| const scroller = document.getElementById('scroller'); |
| scroller.scrollTop = 300; |
| |
| await raf(); |
| await raf(); |
| |
| document.getElementById('spacer').classList.add('changed'); |
| document.documentElement.classList.remove('reftest-wait'); |
| |
| // Should change scroll offset and scroll adjustment to 200. |
| } |
| runTest(); |
| </script> |
| |
