Steps to Reproduce

<zk>
  <spinner />
  <timebox />
  <doublespinner />
</zk>

Click up/down button

Current Result

In IE and Firefox, the active style is not working.

Expected Result

In IE and Firefox, the active style is working.

Debug Information

IE bug: https://stackoverflow.com/q/10753215 Demo: https://www.jsnippet.net/snippet/1760/
Firefox bug: https://stackoverflow.com/q/51916402 Demo: https://jsfiddle.net/kwnmbzfL/23/

Workaround

Use jQuery to add active class on mousedown, and remove active class on mouseup.