| <!DOCTYPE html> |
| <style> |
| .container { |
| overflow: hidden; |
| width: 40px; |
| height: 40px; |
| background: red; |
| } |
| #floatBox { |
| display: none; |
| width: 40px; |
| height: 20px; |
| background: green; |
| } |
| .sibling { |
| margin-top: 20px; |
| width: 40px; |
| height: 20px; |
| background: green; |
| } |
| </style> |
| <div>There should be a green square below, and no red.</div> |
| <div class=container> |
| <span> |
| <div id=floatBox></div><div class=sibling></div> |
| </span> |
| </div> |
| <script> |
| document.body.offsetTop; |
| floatBox.style.display = "block"; |
| floatBox.style.float = "left"; |
| </script> |
