Master JavaScript Event Propagation: Bubbling & Capturing (2026 Interview Prep)
In this comprehensive 2026 guide, we master the essentials of JavaScript Event Propagation.
Whether you are a beginner or a senior developer preparing for a technical interview, understanding the "order of operations" for events is critical. We break down the three core phases of propagation - Bubbling, Capturing (Trickling), and Delegation - using clear, visual examples and real-world code snippets.
⏱️ Chapters
00:00 Intro
00:45 What is Event Propagation?
01:50 HTML & CSS Setup for Examples
02:30 Default Behavior: Event Bubbling
03:45 event.target vs. event.currentTarget vs. this
05:10 Deep Dive into Event Capturing (Trickling)
06:25 The Shortcut: Third Parameter Options
07:40 Tricky Interview Question: Custom Propagation Order
09:15 Summary & Final Interview Tips
What you will learn:
✓ The Fundamentals: What "propagation" actually means in the context of the DOM.
✓ Event Bubbling: Why events move from child to parent by default (and how to visualize it like soap bubbles).
✓ Event Capturing: How to reverse the flow to move from the top down using the capture property.
✓ Target vs. CurrentTarget: Learn the difference between the element that triggered the event and the element currently handling it.
✓ The "this" Keyword: Why this is identical to event.currentTarget in event listeners.
✓ Interview Logic: How to handle tricky requirements, such as making a parent fire after a child but before a grandparent.
📚 Resources & Links
🚀 Get the Code: https://github.com/logicbaselabs/even...
🔗 Event Delegation - • Event Delegation: Must-Know JS Interview Tip
Connect with me:
🔗 My Website - https://www.sumitsaha.me
🔗 Facebook Page - / @logicbaselabs
🔗 LinkedIn Page - / logicbaselabs
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