In a nested event listener scenario, what gets executed first?

In a nested event listener scenario, the order of execution is determined by how event listeners are triggered in the event propagation phase. When an event occurs, it first travels down the DOM hierarchy (the capturing phase) before it bubbles back up (the bubbling phase). In the context of nested event listeners, the outer event listener is executed first during the capturing phase. Once the event reaches the target element, it will then execute the inner listener.

This cascading behavior follows the event propagation model in the browser, where events are typically captured and then bubbled. Since the outer event listener is set on a parent element surrounding the inner element, it will be executed before the inner listener when an event occurs on the inner element. Thus, the correct understanding of event listener execution in JavaScript supports that the outer event listener executes first before the inner one is triggered.