Please read the focus-trap documentation to understand what a focus trap is, what happens when a focus trap is activated, and what happens when one is deactivated.
This project is a simple Ember modifier that allow you to trap DOM nodes in your applications.
Below is a simple demo if a focus trap working. Click below to active the trap. You will notice that you can't tab to elements out of the box.
When a focus trap is active, the box will be highlighted.