| <!DOCTYPE html> |
| <title>Tests anchor positioned scrolling with fragmented containing block</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll"> |
| <link rel="author" href="mailto:xiaochengh@chromium.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/test-common.js"></script> |
| |
| <style> |
| body { |
| margin: 0; |
| } |
| #multicol { |
| column-count: 3; |
| column-width: 90px; |
| column-gap: 10px; |
| width: 300px; |
| height: 100px; |
| } |
| |
| #cb { |
| height: 300px; |
| background: yellow; |
| position: relative; |
| } |
| |
| #spacer { |
| height: 110px; |
| } |
| |
| #scroller { |
| overflow-y: scroll; |
| height: 80px; |
| background: blue; |
| } |
| |
| #anchor { |
| anchor-name: --a; |
| width: 50px; |
| height: 50px; |
| background: orange; |
| position: relative; |
| top: 80px; |
| } |
| |
| #target { |
| position: absolute; |
| left: anchor(--a left); |
| bottom: anchor(--a top); |
| position-anchor: --a; |
| width: 50px; |
| height: 50px; |
| background: lime; |
| } |
| </style> |
| |
| <div id=multicol> |
| <div id=cb> |
| <div id=spacer></div> |
| <div id=scroller> |
| <div id=anchor></div> |
| </div> |
| <div id=target></div> |
| </div> |
| </div> |
| |
| <script> |
| promise_test(async () => { |
| scroller.scrollTop = 10; |
| await waitUntilNextAnimationFrame(); |
| await waitUntilNextAnimationFrame(); |
| |
| let targetRect = target.getBoundingClientRect(); |
| assert_equals(targetRect.top, 30); |
| }, 'Scrolling should work in fragmented containing block'); |
| </script> |
