| <!DOCTYPE html> |
| <html class="reftest-wait"> |
| <title>Tests anchor-positioned element paint order in composited scrolling</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll"> |
| <link rel="author" href="mailto:[email protected]"> |
| <link rel="match" href="reference/anchor-scroll-composited-scrolling-006-ref.html"> |
| <style> |
| body { |
| margin: 0; |
| } |
| #scroller { |
| width: 200px; |
| height: 100px; |
| overflow: scroll; |
| will-change: scroll-position; |
| } |
| #spacer { |
| height: 400px; |
| } |
| #anchor { |
| width: 100px; |
| height: 100px; |
| anchor-name: --a; |
| } |
| #target { |
| position: absolute; |
| width: 100px; |
| height: 100px; |
| background: red; |
| left: 0; |
| bottom: anchor(top); |
| position-anchor: --a; |
| } |
| #overlap { |
| position: absolute; |
| width: 100px; |
| height: 100px; |
| top: 150px; |
| left: 0; |
| z-index: 100; |
| background: green; |
| } |
| </style> |
| |
| <div id="overlap"></div> |
| <div id="scroller"> |
| <div id="spacer"></div> |
| <div id="anchor"></div> |
| </div> |
| <div id="target"></div> |
| |
| <script type="module"> |
| function raf() { return new Promise(resolve => requestAnimationFrame(resolve)); } |
| |
| await raf(); |
| await raf(); |
| scroller.scrollTop = 150; |
| |
| document.documentElement.classList.remove('reftest-wait'); |
| </script> |
| </html> |
