"Missile launch" button pattern name and implementation?

I am curious about a specific confirmation pattern. The best way I could describe it is the "missile launch" pattern, where the user has to "arm" the button by removing some sort of cover before pressing it to perform the action.

Reddit implemented it a few years ago for one of their April fools.

I am aware of this question but it is a few years old and doesn't mention it.

• Is there a common name for this pattern?
• Is there a library that implements it for the web?