| <!DOCTYPE html> |
| <title>CSS Anchor Positioning: Transition to a flipped state</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply"> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-fallbacks-try-tactic"> |
| <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: 325px; |
| } |
| #anchor { |
| position: absolute; |
| width: 50px; |
| height: 50px; |
| background: coral; |
| left: 250px; |
| top: 50px; |
| anchor-name: --a; |
| } |
| #target { |
| position-anchor: --a; |
| position: absolute; |
| left: anchor(right); |
| top: anchor(top); |
| width: 50px; |
| height: 50px; |
| background: skyblue; |
| position-try-fallbacks: flip-start; |
| } |
| #target.anim { |
| transition: left 1000s steps(2, start); |
| } |
| </style> |
| <div id=cb> |
| <div id=anchor></div> |
| <div id=target></div> |
| </div> |
| <script> |
| function cleanup() { |
| target.className = ''; |
| cb.className = ''; |
| } |
| |
| test((t) => { |
| t.add_cleanup(cleanup); |
| assert_equals(target.offsetLeft, 300); |
| cb.classList.add('shrink'); |
| target.classList.add('anim'); |
| assert_equals(target.offsetLeft, 275); |
| }, 'Transition to a flipped state'); |
| |
| test((t) => { |
| t.add_cleanup(cleanup); |
| cb.classList.add('shrink'); |
| assert_equals(target.offsetLeft, 250); |
| cb.classList.remove('shrink'); |
| target.classList.add('anim'); |
| assert_equals(target.offsetLeft, 275); |
| }, 'Transition to an unflipped state'); |
| |
| </script> |
