Explain event bubbling in JavaScript.

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Event bubbling in JavaScript is a behavior where an event starts from the target element and then bubbles up through its ancestors in the DOM hierarchy, triggering any event handlers along the way.

How It Works:

When an event occurs (like a click), it goes through three phases:

1. Capturing Phase (rarely used):
   The event travels from the window down to the target element.

2. Target Phase:
   The event reaches the actual element that triggered it.

3. Bubbling Phase:
   The event bubbles up from the target element to the top of the DOM (document), triggering any attached event listeners on parent elements.

Output when clicking the button:

The click first triggers the child’s handler, then bubbles up to the parent.

Preventing Bubbling:

To stop the event from bubbling, use event.stopPropagation():

Why It Matters:

• Useful for event delegation, where you attach a single event listener to a parent to handle events on multiple child elements.

• Helps optimize performance and simplify code.

Understanding bubbling helps avoid unexpected behavior and improves control over how events are handled in complex interfaces.

Read More

What is the DOM and how is it manipulated with JavaScript?

What are the types of CSS positioning?

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