| <!DOCTYPE html> |
| <title>CSS Anchor Positioning: Invalidation from changing the base style</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/"> |
| <link rel="help" href="https://issues.chromium.org/issues/333608683"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| @position-try --pt { |
| width: 50px; /* Undo force overflow */ |
| } |
| #cb { |
| position: relative; |
| width: 200px; |
| height: 200px; |
| border: 1px solid black; |
| } |
| #anchor { |
| position: absolute; |
| left: 75px; |
| top: 75px; |
| width: 50px; |
| height: 50px; |
| background: coral; |
| anchor-name: --a; |
| } |
| #anchored { |
| position: absolute; |
| position-anchor: --a; |
| position-try-fallbacks: --pt flip-start; |
| inset: 0; |
| top: anchor(top); |
| bottom: anchor(bottom); |
| right: calc(anchor(left) + 5px); |
| width: 50px; |
| height: 50px; |
| background: skyblue; |
| justify-self: end; |
| } |
| #anchored.flip { |
| background: seagreen; |
| width: 300px; /* Force overflow */ |
| } |
| </style> |
| <div id=cb> |
| <div id=anchor></div> |
| <div id=anchored></div> |
| </div> |
| <script> |
| test(() => { |
| // Initially to the left. |
| assert_equals(anchored.offsetLeft, 20); |
| assert_equals(anchored.offsetTop, 75); |
| |
| // Flips to the right. |
| anchored.classList.toggle('flip'); |
| assert_equals(anchored.offsetLeft, 75); |
| assert_equals(anchored.offsetTop, 20); |
| |
| // Flips to the original position. |
| anchored.classList.toggle('flip'); |
| assert_equals(anchored.offsetLeft, 20); |
| assert_equals(anchored.offsetTop, 75); |
| }, 'The chosen position fallbacks changes when the base style differs'); |
| </script> |
