| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-position"> |
| <link rel="match" href="block-axis-constraint-changes-for-out-of-flow-box-ref.html"> |
| <meta name="assert" content="top anchored abs pos child moves when containing block border changes."> |
| <style> |
| .parent_block { |
| position: relative; |
| width: 200px; |
| height: 100px; |
| box-sizing: border-box; |
| } |
| .child { |
| position: absolute; |
| left: 0px; |
| width: 50px; |
| height: 50px; |
| background-color: green; |
| } |
| </style> |
| <div class=parent_block> |
| <div id=child_top class=child style="top: 0px;"></div> |
| </div> |
| <div class=parent_block> |
| <div id=child_bottom class=child style="bottom: 0px;"></div> |
| </div> |
| <script> |
| document.body.offsetTop; |
| child_top.parentNode.style.borderTop = "50px solid blue"; |
| child_bottom.parentNode.style.borderBottom = "50px solid blue"; |
| </script> |
