Hi Keith,
Scripts in an iframe can’t be conflicted with scripts in the parent page.
Maybe something in your parent page or ActivePresenter HTML5 output keeps stealing focus so the dropdown is closed.
If your project contains an object having a tab order, the HTML5 output will keep focusing on that object. It may cause this issue on some browsers such as Chrome. We’ll check to see if there’s any workaround and get back to you later.
Regards