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JavaScript Scroll and Intersection Observer

Build Netflix-style experiences! Master the observers that power modern web performance.

4.5
Advance

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JavaScript Scroll and Intersection Observer
5 Modules
March 2026
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Course Curriculum

5 Modules · 5 Chapters · 12 Topics · 91 Sub-topics

01
Foundation
1 Chapters · 1 Topics · 14 Sub-topics
Introduction to the DOM
1 Topics
DOM Fundamentals
14 Sub-topics
What is the Document Object Model
DOM as a Programming Interface
How Browsers Build the DOM
DOM vs HTML Source Code
DOM Tree Visualization
Understanding Nodes
Node Types Overview
Element Nodes vs Text Nodes
Comment Nodes and Document Nodes
DOM and JavaScript Relationship
Browser Developer Tools for DOM
Inspecting DOM in DevTools
Live DOM Editing
DOM Specifications and Standards
02
Scroll APIs
1 Chapters · 3 Topics · 19 Sub-topics
Scroll APIs
3 Topics
Scroll Properties
7 Sub-topics
Scroll Properties Overview
scrollTop Property
scrollLeft Property
scrollHeight and scrollWidth
Detecting Scroll Position
window.scrollX and scrollY
window.pageXOffset and pageYOffset
Scroll Methods
6 Sub-topics
scroll Method
scrollTo Method
scrollBy Method
Smooth Scrolling Options
Element.scrollIntoView
scrollIntoView Options
Scroll Events
6 Sub-topics
scroll Event
Scroll Event Throttling
Infinite Scroll Pattern
Scroll Spy Implementation
Scroll Restoration
Scroll Best Practices
03
Scroll Events
1 Chapters · 3 Topics · 19 Sub-topics
Scroll APIs
3 Topics
Scroll Properties
7 Sub-topics
Scroll Properties Overview
scrollTop Property
scrollLeft Property
scrollHeight and scrollWidth
Detecting Scroll Position
window.scrollX and scrollY
window.pageXOffset and pageYOffset
Scroll Methods
6 Sub-topics
scroll Method
scrollTo Method
scrollBy Method
Smooth Scrolling Options
Element.scrollIntoView
scrollIntoView Options
Scroll Events
6 Sub-topics
scroll Event
Scroll Event Throttling
Infinite Scroll Pattern
Scroll Spy Implementation
Scroll Restoration
Scroll Best Practices
04
Intersection Observer
1 Chapters · 3 Topics · 19 Sub-topics
Intersection Observer API
3 Topics
Observer Basics
8 Sub-topics
Intersection Observer Introduction
Use Cases for Intersection Observer
Creating an Observer
Observer Callback Function
IntersectionObserverEntry Object
isIntersecting Property
intersectionRatio Property
boundingClientRect Property
Observer Configuration
7 Sub-topics
Observer Options
root Option
rootMargin Option
threshold Option
observe Method
unobserve Method
disconnect Method
Practical Applications
4 Sub-topics
Lazy Loading Images
Infinite Scroll with IO
Animation on Scroll
IO Best Practices
05
Practical Applications
1 Chapters · 2 Topics · 20 Sub-topics
Performance Optimization - DOM
2 Topics
Reflow and Repaint
8 Sub-topics
DOM Performance Overview
Reflow and Repaint
What Triggers Reflow
What Triggers Repaint
Layout Thrashing
Avoiding Layout Thrashing
Batching DOM Reads/Writes
requestAnimationFrame for Batching
DOM Optimization
12 Sub-topics
Document Fragments
Virtual DOM Concepts
Minimizing DOM Access
Caching DOM References
Event Delegation for Performance
Passive Event Listeners
Debouncing and Throttling
Lazy Loading
Code Splitting for DOM
Memory Leaks in DOM
Detached DOM Elements
Performance Measurement Tools

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