| <!DOCTYPE html> |
| <style> |
| #container { |
| position: relative; |
| width: 100px; |
| height: 100px; |
| } |
| |
| #anchor { |
| position: absolute; |
| anchor-name: --a; |
| left: 0; |
| top: 0; |
| width: 10px; |
| height: 10px; |
| background: cornflowerblue; |
| } |
| |
| #target { |
| position: absolute; |
| position-anchor: --a; |
| left: 0; |
| top: anchor(bottom); |
| width: 10px; |
| height: 80px; |
| background: lime; |
| position-try-fallbacks: --fallback; |
| } |
| |
| @position-try --fallback { |
| left: anchor(right); |
| top: 0; |
| width: 10px; |
| height: 10%; |
| } |
| |
| </style> |
| <div id="container"> |
| <div id="anchor"></div> |
| <div id="target"></div> |
| </div> |
| <script> |
| document.body.offsetTop; |
| document.getElementById('container').style.height = '20px'; |
| </script> |
