What is Bootstrap?

Introduction to Bootstrap 5 — What is Bootstrap? — Key features of Bootstrap 5 — Differences from Bootstrap 4 — CDN vs local installation Bootstrap 5 Setup — Adding Bootstrap via CDN — Folder structure for custom projects — Responsive viewport meta tag Bootstrap Grid System — Container, container-fluid — Rows and columns — Breakpoints (xs, sm, md, lg, xl, xxl) — Column ordering and nesting Layout Utilities — Margin and padding (m-, p-) — Display utilities (d-flex, d-none, etc.) — Flexbox utilities — Positioning (position-absolute, position-relative, etc.) Typography — Headings and display classes — Lead, small, muted text — Text alignment and transform — Lists and inline text Buttons — Basic button classes — Outline buttons — Button sizes and block buttons — Button groups and toolbars Alerts — Basic alerts — Dismissible alerts — Alert color classes Badges — Pill badges — Positioned badges Cards — Card structure — Card headers, footers, and body — Image overlays and background colors Images and Figures — Responsive images — Image thumbnails — Rounded and circle classes Tables — Table classes (table, table-striped, etc.) — Table borders, hover, dark — Responsive tables Forms — Form layout (form-control, form-group) — Input types — Checkboxes and radio buttons — Floating labels — Validation styles Navs and Navbars — Basic nav and tabs — Navbars with toggler — Responsive collapse — Navbar colors and alignment Dropdowns — Basic dropdowns — Dropdown in navbar — Drop directions and alignment Modals — Modal structure — Triggering modals with buttons — Sizing and positioning — Scrollable and centered modals Collapse and Accordion — Toggle sections — Multiple collapsible items — Accordion example Carousel — Basic carousel setup — Adding images and captions — Controls and indicators — Interval and autoplay Tooltips and Popovers — Enabling tooltips with JavaScript — Positioning — Trigger types (hover, click) Spinners and Progress Bars — Border and grow spinners — Progress bar variations — Striped and animated bars Bootstrap Helpers and Utilities — Text and background utilities — Shadows and borders — Sizing (w-25, h-100, etc.) — Overflow and visibility Customizing Bootstrap — Overriding variables with SCSS — Using Bootstrap source files — Theming and custom color palettes Responsive Design Best Practices — Media queries in Bootstrap — Utility classes by breakpoint — Mobile-first strategy Accessibility in Bootstrap — ARIA roles and labels — Keyboard navigation — Best practices Bootstrap Icons — Using Bootstrap Icons CDN — Icon sizing and styling — Combining icons with buttons and navs Mini Projects — Responsive Portfolio Page — Admin Dashboard Layout — Login/Signup Form — Pricing Table — Landing Page with Modals and Carousel

What is Bootstrap?

Understand What is Bootstrap? in Bootstrap 5 for responsive web design using pre-built components.

What is Bootstrap?

Bootstrap is a free and open-source front-end framework used for developing responsive and mobile-first websites and web applications. It includes HTML, CSS, and JavaScript-based design templates for UI components such as buttons, forms, modals, navigation bars, and more.

History of Bootstrap

Bootstrap was developed by Mark Otto and Jacob Thornton at Twitter as an internal tool named “Twitter Blueprint.” It was later released as an open-source project in 2011. Since then, it has grown in popularity and is maintained by the open-source community. The latest version, Bootstrap 5, has dropped dependency on jQuery and supports modern CSS features.

Key Features of Bootstrap

  • Responsive Grid System
  • Prebuilt Components (Navbars, Buttons, Cards, etc.)
  • Utility Classes for Spacing, Colors, Alignment
  • Mobile-first Design
  • Extensive JavaScript Plugins (Modals, Carousels, etc.)
  • Customizable via SCSS

Advantages of Using Bootstrap

  • Speeds up development
  • Cross-browser compatibility
  • Consistent design framework
  • Large support community
  • Easy to learn and implement

Bootstrap Grid System

Bootstrap uses a responsive, mobile-first 12-column grid system that scales up to 6 breakpoints: xs, sm, md, lg, xl, and xxl. This makes it easy to build layouts that adapt to any screen size.

Column 1
Column 2
Column 3

Getting Started with Bootstrap

You can start using Bootstrap in two ways:

  • Via CDN: Include the Bootstrap CSS and JS files from a CDN.
  • Via Download: Download Bootstrap from the official website and include the files locally.

Example (CDN method):

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>

Where is Bootstrap Used?

Bootstrap is widely used in:

  • Personal Portfolios and Blogs
  • Admin Dashboards
  • eCommerce Websites
  • Landing Pages
  • Web Applications

Conclusion

Bootstrap is a powerful front-end framework that helps developers quickly build responsive and modern websites. Its grid system, ready-to-use components, and utility classes make web development faster and easier for both beginners and professionals.

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