Web Development chapters
  1. 01HTML5 & Semantic Web Architecture
  2. 02CSS3 & Modern Styling Architecture
  3. 03Modern JavaScript (ES6+ & Asynchronous Engine)
  4. 04React.js Frontend Framework
  5. 05Backend Architecture with Node.js & Express

Chapter 3 · HTML, CSS, JS, React, Node

Modern JavaScript (ES6+ & Asynchronous Engine)

14 topics in 3 parts

Key ideas

Flex Container (display: flex; justify-content: space-between; align-items: center;) Main Axis (Row) ➜ Cross Axis ⬇ Flex Item 1 flex: 1 Flex Item 2 flex: 2 (Grows) Flex Item 3 flex: 1
Modern JavaScript (ES6+ & Asynchronous Engine)
Technical AspectRecommended StandardCommon Pitfall to Avoid
DOM / Render PerformanceHardware accelerated transforms & batch updatesForcing synchronous layout thrashing (repeated offsetHeight calls)
Accessibility (a11y)Semantic tags with proper ARIA attributesDiv soup with no keyboard navigation
Responsive DesignFluid layouts using Flexbox, CSS Grid & clamp()Fixed pixel widths causing mobile horizontal overflows
State ManagementUnidirectional data flow with clean cleanup hooksDirect DOM manipulation or stale closure bugs
CALL STACK (LIFO) fn3() [Top Frame] fn2() main() / global WEB APIs / BROWSER DOM, setTimeout, fetch() Thread Pool Execution EVENT LOOP ↻ Microtask Queue (VIP): Promise.then, queueMicrotask (Drained First!) Macrotask Queue: setTimeout, setInterval, I/O callbacks
Modern JavaScript (ES6+ & Asynchronous Engine)

All 14 topics in Modern JavaScript (ES6+ & Asynchronous Engine)

  1. JavaScript

    • var vs let vs const & Hoisting
    • Data Types & Strict Equality
    • Arrow Functions & Lexical this
    • JavaScript Closures
    • Destructuring & Spread Operator
    • Array map, filter, reduce
    • Prototypes & Prototypal Inheritance
    • DOM Manipulation APIs
    • Event Delegation & Bubbling

  2. Async JS

    • JavaScript Event Loop
    • JavaScript Promises
    • async / await Syntax
    • Fetch API & Network Requests

  3. JavaScript

    • ES Modules & Bundling