JAVASCRIPT
- Understanding Hoisting in JavaScript
- Understanding Closures in JavaScript: A Complete Guide for Beginners
- Understanding Anonymous Functions in JavaScript
- JavaScript Functions: A Complete Guide
- Var vs let vs const in JavaScript
- Understanding Temporal Dead Zone (TDZ) in JavaScript
- what is surrounding state and lexical environment
- Understanding the Scope Chain in JavaScript
- How Javascript Works And Code is executed
- What is undefined and null in JavaScript?
- What are template literals in JavaScript?
- What is the difference between typeof and instanceof?
- What is a callback function?
- Explain IIFE (Immediately Invoked Function Expression).
- What is the difference between function declarations and function expressions?
- What is the arguments object in JavaScript?
- What are rest parameters and default parameters?
- What are first-class functions?
- What is the difference between call, apply, and bind?
- Explain private variables in JavaScript.
- What is an object in JavaScript?
- What are object properties and methods?
- What are getters and setters in JavaScript?
- Difference between object literal and constructor function.
- What is the difference between Object.freeze and Object.seal?
- How does Object.create() work?
- What is the DOM?
- How do you prevent default behavior of events?
- Difference between innerHTML, innerText, and textContent.
- Understanding Events in JavaScript: A Complete Guide
- How to Chain Promises in JavaScript? (Complete Guide)
- What is the difference between function scope and block scope?
- What are data attributes?
- Understanding the JavaScript Event Loop: A Complete Guide
- Explain this keyword in JavaScript.
- What is prototype and prototypal inheritance?
- How do you add or remove properties from an object?
- Difference between array and object.
- What is event delegation?
- What are array methods like map, filter, reduce?
- How do you clone an array?
- Difference between forEach and map.
- What is destructuring?
- What are template literals?
- What are modules in JavaScript?
- What is spread and rest operator?
- Difference between import and require.
- What is a promise?
- How do you remove an event listener?
- Explain async/await in JavaScript.
- Difference between HTMLCollection and NodeList.
- How do you select elements in DOM?
- Explain event delegation.
- What is a generator function?
- What is the difference between bubbling and capturing?
- How to create and remove DOM elements dynamically?
- How to traverse the DOM?
- Explain event bubbling and capturing.
- Difference between onclick and addEventListener.
- What is preventDefault and stopPropagation?
- How to handle keyboard events?
- How to handle mouse events?
- How to handle form submission using JS?
- Difference between synchronous and asynchronous code.
- Explain memoization in JavaScript.
- Explain debounce and throttle.
- Difference between shallow copy and deep copy.
- What is Proxy and Reflect in JavaScript?
- Explain Symbol in JavaScript.
What is the DOM?
The DOM (Document Object Model) is a programming interface for web documents.
In simple terms:
- When a web page (HTML or XML) is loaded into the browser, the browser creates a DOM representation of that document.
- It represents the page as a tree structure of nodes (objects), where each element, attribute, and piece of text in the HTML is a node in the tree.
- JavaScript (and other languages) can use the DOM API to access, manipulate, and update the content, structure, and styles of the page dynamically.
Example
If you have an HTML document:
<html>
<body>
<h1>Hello World</h1>
<p>This is a paragraph.</p>
</body>
</html>
The DOM representation looks like a tree:
Document
└── html
└── body
├── h1 ("Hello World")
└── p ("This is a paragraph.")
Key Points
- Tree Structure → Every HTML element becomes a node in a hierarchical tree.
- Dynamic Access → JavaScript can use DOM methods like
getElementById(),querySelector(),createElement(), etc. - Live Representation → If the HTML changes (e.g., via JavaScript), the DOM updates instantly.
👉 In short: The DOM is the bridge between HTML/CSS and JavaScript, letting us make web pages interactive and dynamic.
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