Hide element when target is hidden

[Mikhail Vyrodov]

Let's imagine there is a dropdown, based on tether. It has button that opens and closes dropdown content. This button can be visible on the page or not. It depends of external conditions. We open dropdown content and after some seconds this button has been disappearing, but dropdown content is still visible, because It doesn't know about button, its target.
So how about realize this?

[Trevor Burnham]

I don't think this is possible without using MutationObserver, which is beyond the scope of what Tether does.