bootstrap·Beginner·Last tested: 2026-03·~5 min read

Bootstrap

Bootstrap is the most popular HTML, CSS, and JavaScript framework for building responsive, mobile-first web projects. It provides a complete toolkit of pre-built components and utilities for rapid UI development.

Key Features

Responsive grid system - Flexbox-based 12-column layout that adapts to any screen size
Pre-built components - Buttons, modals, navigation, forms, and dozens of other UI elements
Utility classes - Spacing, typography, colors, and layout utilities for quick styling
Customizable with Sass - Override variables and build custom themes
JavaScript plugins - Interactive components like carousels, dropdowns, and tooltips
RTL support - Built-in right-to-left language support

Installation

Install via npm:

npm install bootstrap

Or include via CDN:

<!-- CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet">

<!-- JavaScript Bundle -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/js/bootstrap.bundle.min.js"></script>

Basic Usage

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet">
    <title>Bootstrap Example</title>
</head>
<body>
    <div class="container">
        <div class="row">
            <div class="col-md-6">
                <h1 class="text-primary">Hello Bootstrap</h1>
                <button class="btn btn-success">Click me</button>
            </div>
        </div>
    </div>
    
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>

Tip

Bootstrap 5 no longer requires jQuery. All JavaScript components are built with vanilla JavaScript.

Notable Details

License: MIT
Language: Sass/SCSS, JavaScript
Community: 174k+ GitHub stars, massive ecosystem
Maintained by: Twitter's former team, now independent
Current version: Bootstrap 5.x (Bootstrap 4 available on separate branch)