| <!DOCTYPE html> |
| <title>CSS Anchor Positioning: Transition when @position-try is applied</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #cb { |
| display: inline-block; |
| position: relative; |
| width: 400px; |
| height: 250px; |
| border: 1px solid black; |
| } |
| #cb.shrink { |
| width: 300px; |
| } |
| #target { |
| position: absolute; |
| left: 300px; |
| width: 50px; |
| height: 50px; |
| background: skyblue; |
| } |
| #target.fallback { |
| position-try-fallbacks: --200; |
| } |
| #target.anim { |
| transition: left 1000s steps(2, start); |
| } |
| @position-try --200 { |
| left: 200px; |
| } |
| </style> |
| <div id=cb> |
| <div id=target></div> |
| </div> |
| <script> |
| function cleanup() { |
| target.className = ''; |
| cb.className = ''; |
| // Clean up running transition |
| target.getAnimations().forEach(a => a.cancel()); |
| } |
| |
| test((t) => { |
| t.add_cleanup(cleanup); |
| assert_equals(target.offsetLeft, 300); |
| cb.classList.add('shrink'); |
| target.classList.add('fallback', 'anim'); |
| // Now we take the --200 fallback: |
| assert_equals(target.offsetLeft, 250); |
| }, 'Transition when @position-try is applied'); |
| |
| test((t) => { |
| t.add_cleanup(cleanup); |
| cb.classList.add('shrink'); |
| target.classList.add('fallback'); |
| assert_equals(target.offsetLeft, 200); |
| cb.classList.remove('shrink'); |
| target.classList.remove('fallback'); |
| target.classList.add('anim'); |
| assert_equals(target.offsetLeft, 250); |
| }, 'Transition when @position-try is unapplied'); |
| </script> |
