| <!DOCTYPE html> |
| <title>Tests scrolling with anchor in fixed-positioned scroller</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; |
| height: 200vh; |
| } |
| |
| #scroller { |
| position: fixed; |
| width: 200px; |
| height: 200px; |
| overflow-y: scroll; |
| } |
| |
| #anchor { |
| position: absolute; |
| width: 100px; |
| height: 100px; |
| top: 200px; |
| background: orange; |
| anchor-name: --a; |
| } |
| |
| #target { |
| position: fixed; |
| width: 100px; |
| height: 100px; |
| bottom: anchor(--a top); |
| anchor-default: --a; |
| background: lime; |
| } |
| </style> |
| |
| <div id=scroller> |
| <div id=anchor></div> |
| </div> |
| <div id=target></div> |
| |
| <script> |
| promise_test(async () => { |
| await waitUntilNextAnimationFrame(); |
| assert_equals(target.getBoundingClientRect().top, 100); |
| |
| document.documentElement.scrollTop = 100; |
| await waitUntilNextAnimationFrame(); |
| assert_equals(target.getBoundingClientRect().top, 100); |
| }, 'Target should not scroll with viewport when anchor is in fixed-positioned scroller'); |
| </script> |
