When we want to detect which internal component we are clicking on some webcomponent,we can use **event.composed** to check whether the event is broadcasted through a webcomponent, and then check the array list returned from **event.composedPath()** to look up the DOM, if found then we can confirm we are clicking on the specified DOM node and do some specific things.

https://developer.mozilla.org/en-US/docs/Web/API/Event/composedPath