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Web Development Beginner

What is DOM (Document Object Model)?

A programming interface for HTML documents that represents the page structure as a tree of objects that can be manipulated with JavaScript.

The DOM represents HTML as a tree of nodes. JavaScript can read, modify, add, and remove elements: document.getElementById("id"), element.innerHTML, document.createElement("div"), parent.appendChild(child). Events (click, submit, keypress) trigger JavaScript functions.

Direct DOM manipulation is slow for complex updates. Modern frameworks (React, Vue) use a Virtual DOM — an in-memory representation that calculates minimal changes before updating the real DOM. Understanding the DOM is fundamental to frontend development.

Related Terms

Middleware
Software that sits between the request and response in a web application, performing processing like authentication or logging.
Service Worker
A JavaScript file that runs in the background, enabling offline support, push notifications, and background sync for web apps.
Web Components
A set of browser-native APIs for creating reusable, encapsulated custom HTML elements with their own styling and behavior.
TypeScript
A typed superset of JavaScript that adds static type checking, interfaces, and advanced IDE support to JavaScript development.
MVC (Model-View-Controller)
An architectural pattern that separates an application into three components: data (Model), interface (View), and logic (Controller).
Web Font Optimization
Techniques for loading custom fonts efficiently to minimize their impact on page load performance and visual stability.
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