| <!DOCTYPE html> | |
| <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1498297"> | |
| <style> | |
| * { | |
| margin-top: 100px; | |
| padding-left: 100px; | |
| position: sticky; | |
| bottom: 0px; | |
| } | |
| </style> | |
| <select id="select1" multiple="multiple" style="writing-mode: vertical-rl"> | |
| <optgroup id="optgroup">text</optgroup> | |
| </select> | |
| <select id="select2" >text</select> | |
| <script> | |
| document.body.offsetTop; | |
| select2.add(optgroup); | |
| document.body.offsetTop; | |
| select1.length = 1; | |
| </script> |