| <!DOCTYPE html> | |
| <p>There should be no red on this page.</p> | |
| <div style="position:relative;"> | |
| <div id="elm" style="width:200px; height:200px; background:red;"> | |
| <div style="position:absolute; top:0; width:200px; height:200px; background:green;"></div> | |
| </div> | |
| </div> | |
| <script> | |
| document.body.offsetTop; | |
| document.getElementById("elm").style.marginLeft = "200px"; | |
| </script> |