| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#scroll"> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-apply"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/test-common.js"></script> |
| <style> |
| #cb { |
| position: relative; |
| width: 200px; |
| height: 200px; |
| border: solid 1px; |
| } |
| |
| #scroller { |
| width: 200px; |
| height: 200px; |
| overflow: scroll; |
| } |
| |
| #abspos { |
| position: absolute; |
| background: hotpink; |
| width: 50px; |
| height: 50px; |
| |
| position-area: bottom; |
| position-try-fallbacks: flip-block; |
| position-anchor: --a; |
| } |
| |
| #anchor { |
| anchor-name: --a; |
| width: 50px; |
| height: 50px; |
| margin: 150px 0 150px 50px; |
| background: dodgerblue; |
| } |
| |
| </style> |
| <div id="cb"> |
| <div id="scroller"> |
| <div id="anchor"> |
| </div> |
| </div> |
| <div id="abspos"></div> |
| </div> |
| |
| <script> |
| promise_test(async () => { |
| await waitUntilNextAnimationFrame(); |
| assert_fallback_position(abspos, anchor, 'top'); |
| }); |
| |
| promise_test(async () => { |
| scroller.scrollTop = 101; |
| await waitUntilNextAnimationFrame(); |
| assert_fallback_position(abspos, anchor, 'bottom'); |
| }); |
| |
| promise_test(async () => { |
| scroller.scrollTop = 40; |
| await waitUntilNextAnimationFrame(); |
| assert_fallback_position(abspos, anchor, 'top'); |
| }); |
| </script> |
