- run index.zul with IE10 (http://zkfiddle.org/sample/10skd2k/16-Combobox-with-big-list#source-1)
- open combobox
dropdown list's position is wrong. Its CSS style top is wrong calculated.
- If you set height with a fixed pixel e.g. height="155px" , the issue doesn't happen.
- When the combobox is near the Window's bottom border, its offsetHeight is incorrect. try with document.querySelector('.z-combobox-input').getBoundingClientRect()
Increase the window's height