| <body> | |
| <div id="container" style="width: 400px; display: none;"> | |
| <span style="position: relative"> | |
| <br> | |
| <div style="z-index: -1; position: absolute; width: 100px; height: 100px; background-color: green;"></div> | |
| <div id="target" style="display: inline-block; width: 100px; height: 100px; background-color: red;"></div> | |
| </span> | |
| </div> | |
| <script> | |
| document.body.offsetTop; | |
| document.getElementById("container").style.removeProperty("display"); | |
| document.body.offsetTop; | |
| document.getElementById("target").style.height = "0"; | |
| </script> | |
| </body> |