# twbs/bootstrap

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174,380 stars · 78,784 forks · MDX · MIT

## Links

- GitHub: https://github.com/twbs/bootstrap
- Homepage: https://getbootstrap.com
- awesome-repositories: https://awesome-repositories.com/repository/twbs-bootstrap.md

## Topics

`bootstrap` `css` `css-framework` `html` `javascript` `sass` `scss`

## Description

Bootstrap is a comprehensive, mobile-first CSS framework designed for building responsive web interfaces. It provides a standardized library of reusable UI components, such as navigation bars, modals, and forms, alongside a robust grid system that ensures consistent layout alignment across diverse viewport sizes. By establishing a baseline through browser normalization and standardized typography, the project enables developers to create accessible, cross-browser compatible web applications.

The framework distinguishes itself through a modular Sass-based architecture that allows for deep customization of design tokens, global settings, and component themes. It features a comprehensive utility-first class system that enables rapid styling and layout construction directly within HTML markup, reducing the need for custom CSS. Additionally, it incorporates a lightweight JavaScript layer that manages component state and interactivity through data attributes, providing a unified API for complex UI elements like tooltips and dropdowns.

Beyond its core styling capabilities, the project offers extensive support for form management, including advanced input styling, validation feedback, and responsive layout primitives. It also includes built-in support for modern web requirements such as color modes, right-to-left text direction, and fluid typography. The framework is designed to integrate into modern development workflows, supporting standard build tools, module bundlers, and package managers to streamline asset compilation and production optimization.

Developers can implement the framework by integrating precompiled assets directly into their projects or by utilizing the source code to leverage modular imports and build-time configuration.

## Tags

### User Interface & Experience

- [Component-Based UI Libraries](https://awesome-repositories.com/f/user-interface-experience/component-libraries/component-based-ui-libraries.md) — Accelerates development with a collection of pre-built, reusable interface elements like navigation bars, modals, and forms.
- [Navigation Bars](https://awesome-repositories.com/f/user-interface-experience/navigation-components/navigation-bars.md) — Ships flexible, responsive navigation components that support horizontal, vertical, and dropdown configurations. ([source](https://getbootstrap.com/docs/5.3/components/navs-tabs))
- [Flexbox-Based Grid Systems](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/css-layout-systems/flexbox-based-grid-systems.md) — Implements a responsive layout engine that leverages flexbox containers and columns for precise alignment across viewports.
- [Design System Architectures](https://awesome-repositories.com/f/user-interface-experience/ui-architecture/design-utilities/design-systems/theme-architecture-frameworks/design-system-architectures.md) — Maintains consistent global styles and design tokens across complex interfaces using a preprocessor-based foundation.
- [Theme Customization](https://awesome-repositories.com/f/user-interface-experience/ui-architecture/design-utilities/design-systems/theme-architecture-frameworks/theme-customization.md) — Enables visual branding adjustments by overriding global style variables and applying specific utility classes. ([source](https://getbootstrap.com/docs/5.3/customize/overview))
- [Utility-First Class Systems](https://awesome-repositories.com/f/user-interface-experience/component-utilities/utility-first-class-systems.md) — Simplifies layout construction by offering a comprehensive system of single-property utility classes.
- [JavaScript Component Controllers](https://awesome-repositories.com/f/user-interface-experience/presentation-frameworks/lifecycle-state-management/javascript-component-controllers.md) — Coordinates the behavior and state of interactive UI elements like modals and dropdowns using a data-attribute-driven script layer.
- [Utility-First](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/css-utility-libraries/css-toolkits/utility-first.md) — Exposes a vast library of single-property classes for rapid styling directly within HTML markup.
- [Buttons](https://awesome-repositories.com/f/user-interface-experience/buttons.md) — Features interactive button components with configurable sizes, color variants, and state-based styling. ([source](https://getbootstrap.com/docs/5.3/components/buttons))
- [Content Cards](https://awesome-repositories.com/f/user-interface-experience/data-display-components/content-cards.md) — Provides flexible, pre-styled containers that support headers, footers, and images for structured content display. ([source](https://getbootstrap.com/docs/5.3/components/card))
- [CSS Theme Variable Managers](https://awesome-repositories.com/f/user-interface-experience/design-token-management/css-theme-variable-managers.md) — Establishes a centralized system for defining and managing global design tokens like colors, spacing, and typography. ([source](https://getbootstrap.com/docs/5.3/customize/css-variables))
- [Design Tokens](https://awesome-repositories.com/f/user-interface-experience/design-token-management/design-tokens.md) — Centralizes visual properties like colors and spacing into a set of configurable variables for consistent styling. ([source](https://getbootstrap.com/docs/5.3/customize/options))
- [Modal Dialogs](https://awesome-repositories.com/f/user-interface-experience/modal-dialogs.md) — Constructs responsive modal dialogs that overlay content and forms on top of the main interface. ([source](https://getbootstrap.com/docs/5.3/components/modal))
- [Color Modes](https://awesome-repositories.com/f/user-interface-experience/presentation-frameworks/theme-systems/color-modes.md) — Enables theme switching by toggling data attributes to apply light, dark, or custom color modes. ([source](https://getbootstrap.com/docs/5.3/customize/color-modes))
- [Form Control Styles](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/component-styling-tools/component-styling/form-control-styles.md) — Applies consistent, cross-browser styling to form inputs, textareas, selects, and file upload controls. ([source](https://getbootstrap.com/docs/5.3/forms/form-control))
- [Text Utilities](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/css-utility-libraries/css-utilities/text-utilities.md) — Offers a suite of utility classes for modifying text alignment, weight, transformation, and color without writing custom CSS. ([source](https://getbootstrap.com/docs/5.3/content/typography))
- [Box Sizing Configurations](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/css-base-styles/box-sizing-configurations.md) — Sets global box-sizing to border-box to ensure consistent element dimension calculations across all components. ([source](https://getbootstrap.com/docs/5.3/))
- [Data-Attribute-Driven Interactivity](https://awesome-repositories.com/f/user-interface-experience/form-and-input-management/interaction-and-event-handling/ui-interactivity/data-attribute-driven-interactivity.md) — Controls component state and behavior by parsing data attributes on HTML elements to trigger JavaScript-based UI interactions.
- [Color Utilities](https://awesome-repositories.com/f/user-interface-experience/component-utilities/color-utilities.md) — Applies theme-based color utility classes to links to manage text color and hover states consistently. ([source](https://getbootstrap.com/docs/5.3/helpers/colored-links))
- [Tabbed Interfaces](https://awesome-repositories.com/f/user-interface-experience/data-display-components/tabbed-interfaces.md) — Tabbed navigation components organize information into distinct, selectable views for cleaner interface layouts. ([source](https://getbootstrap.com/))
- [Data Tables](https://awesome-repositories.com/f/user-interface-experience/data-tables.md) — Formats borders, row striping, hover states, and responsive behavior for tables using standardized utility classes for data presentation. ([source](https://getbootstrap.com/docs/5.3/content/tables))
- [Dropdown Menus](https://awesome-repositories.com/f/user-interface-experience/navigation-components/dropdown-menus.md) — Interactive menus render links and actions with built-in positioning logic for contextual navigation. ([source](https://getbootstrap.com/))
- [Tooltips](https://awesome-repositories.com/f/user-interface-experience/tooltips.md) — Displays contextual information in small pop-up boxes when users hover over or focus on elements to provide additional guidance. ([source](https://getbootstrap.com/docs/5.3/components/tooltips))
- [Color Palette Management](https://awesome-repositories.com/f/user-interface-experience/ui-architecture/design-utilities/design-systems/color-system-utilities/color-palette-management.md) — Custom color maps generate consistent theme variables and utility classes for unified design systems. ([source](https://getbootstrap.com/docs/5.3/customize/color))
- [Button Groups](https://awesome-repositories.com/f/user-interface-experience/buttons/button-groups.md) — Button groups organize related actions into unified toolbars for improved layout efficiency. ([source](https://getbootstrap.com/docs/5.3/components/button-group))
- [Component APIs and Interfaces](https://awesome-repositories.com/f/user-interface-experience/component-utilities/ui-frameworks/component-apis.md) — Unified programmatic interfaces control component lifecycles, events, and interactions through standard CSS selectors. ([source](https://getbootstrap.com/docs/5.3/getting-started/javascript))
- [Accordion Panels](https://awesome-repositories.com/f/user-interface-experience/data-display-components/accordion-panels.md) — Vertical collapsible panels manage interface space by toggling content visibility for complex information sets. ([source](https://getbootstrap.com/docs/5.3/components/accordion))
- [List Components](https://awesome-repositories.com/f/user-interface-experience/data-display-components/list-components.md) — Flexible list components display collections of items with support for active states, links, and custom content layouts. ([source](https://getbootstrap.com/docs/5.3/components/list-group))
- [Drawers](https://awesome-repositories.com/f/user-interface-experience/drawers.md) — Hidden sidebars slide into the viewport from any edge to provide accessible space for navigation and interactive controls. ([source](https://getbootstrap.com/docs/5.3/components/offcanvas))
- [Visibility Toggles](https://awesome-repositories.com/f/user-interface-experience/form-and-input-management/interaction-and-event-handling/general-interaction-frameworks/interaction-patterns/visibility-toggles.md) — Visibility toggles manage screen space by showing or hiding content areas on demand through interactive triggers. ([source](https://getbootstrap.com/))
- [Scroll Spy Components](https://awesome-repositories.com/f/user-interface-experience/form-and-input-management/ui-interaction-helpers/scroll-spy-components.md) — Scroll position tracking automatically updates navigation states to highlight active sections based on the current viewport depth. ([source](https://getbootstrap.com/docs/5.3/components/scrollspy))
- [Custom Form Controls](https://awesome-repositories.com/f/user-interface-experience/form-components/custom-form-controls.md) — Replaces native checkbox and radio inputs with accessible, custom-styled alternatives that maintain consistent state behavior. ([source](https://getbootstrap.com/docs/5.3/forms/checks-radios))
- [Input Groups](https://awesome-repositories.com/f/user-interface-experience/form-components/input-groups.md) — Pairs text, buttons, or icons with input fields to create cohesive, visually connected form components. ([source](https://getbootstrap.com/docs/5.3/forms/input-group))
- [Notification Toasts](https://awesome-repositories.com/f/user-interface-experience/notification-toasts.md) — Lightweight notification toasts provide non-blocking status updates with support for custom content and automated dismissal. ([source](https://getbootstrap.com/docs/5.3/components/toasts))
- [Popovers](https://awesome-repositories.com/f/user-interface-experience/popovers.md) — Overlay popovers display contextual information using a consistent positioning engine for precise placement relative to trigger elements. ([source](https://getbootstrap.com/))
- [Select Menus](https://awesome-repositories.com/f/user-interface-experience/select-menus.md) — Customizable select menus support various sizing, disabled states, and styling options via CSS or Sass variables. ([source](https://getbootstrap.com/docs/5.3/forms/select))
- [Responsive Media Utilities](https://awesome-repositories.com/f/user-interface-experience/styling-theming-systems/content-styling/content-specific-styling/responsive-media-utilities.md) — Responsive media utilities automatically adjust image dimensions to fit parent containers while maintaining aspect ratios. ([source](https://getbootstrap.com/docs/5.3/content/images))
- [Toggle Buttons](https://awesome-repositories.com/f/user-interface-experience/toggle-buttons.md) — Checkbox and radio inputs transform into interactive, button-like selection controls with optional outlined styling. ([source](https://getbootstrap.com/docs/5.3/forms/checks-radios))
- [Component Modifiers](https://awesome-repositories.com/f/user-interface-experience/ui-architecture/design-utilities/design-systems/component-implementation-patterns/component-modifiers.md) — Base classes extend through modifiers and responsive utilities to maintain consistent design patterns across an application. ([source](https://getbootstrap.com/docs/5.3/customize/components))

### Web Development

- [Responsive Web Frameworks](https://awesome-repositories.com/f/web-development/backend-development/web-frameworks/rendering-and-layout-architectures/responsive-web-frameworks.md) — Powers mobile-first, cross-browser layouts using a robust grid system and pre-styled components.
- [Responsive CSS Frameworks](https://awesome-repositories.com/f/web-development/web-standards/responsive-css-frameworks.md) — Standardizes mobile-first interface development through a comprehensive set of layout utilities and pre-styled components.
- [Sass Design Systems](https://awesome-repositories.com/f/web-development/web-infrastructure-deployment/asset-management-build-tools/asset-lifecycle-orchestration/asset-pipelines/css-preprocessors/sass-design-systems.md) — Organizes design tokens and component themes through a modular architecture of preprocessor variables and mixins.
- [Typography Systems](https://awesome-repositories.com/f/web-development/web-standards/typography-systems.md) — Defines global font, size, and line-height settings to ensure uniform text rendering across web applications. ([source](https://getbootstrap.com/docs/5.3/content/typography))
- [Form Layouts](https://awesome-repositories.com/f/web-development/form-handling/form-layouts.md) — Utilizes grid and flexbox-based systems to align form controls, labels, and help text into responsive layouts. ([source](https://getbootstrap.com/docs/5.3/forms/layout))
- [UI Interaction Controllers](https://awesome-repositories.com/f/web-development/frontend-development-tools/ui-interaction-controllers.md) — Manages component transitions, state, and accessibility requirements via lightweight JavaScript controllers.
- [Sass-Based Preprocessor Architectures](https://awesome-repositories.com/f/web-development/web-infrastructure-deployment/asset-management-build-tools/asset-lifecycle-orchestration/asset-pipelines/css-preprocessors/sass-based-preprocessor-architectures.md) — Provides a modular Sass foundation to enable deep customization through mixins, loops, and variable overrides.
- [Utility-First CSS Frameworks](https://awesome-repositories.com/f/web-development/web-infrastructure-deployment/asset-management-build-tools/style-optimization-tools/css-build-tools/utility-first-css-frameworks.md) — Delivers a comprehensive suite of low-level utility classes for building custom interface designs directly in markup.
- [Browser Normalizers](https://awesome-repositories.com/f/web-development/web-standards/advanced-css-styling/browser-normalizers.md) — Includes a base stylesheet that normalizes HTML rendering and typography across different web browsers. ([source](https://getbootstrap.com/docs/5.3/content/reboot))
- [Custom Utility Registrations](https://awesome-repositories.com/f/web-development/web-standards/responsive-css-frameworks/custom-utility-registrations.md) — Generates and extends custom utility classes for responsive design and layout properties through a programmatic API. ([source](https://getbootstrap.com/))
- [Form Column Sizing](https://awesome-repositories.com/f/web-development/form-handling/form-column-sizing.md) — Defines specific column widths for form controls using standard grid column classes for responsive alignment. ([source](https://getbootstrap.com/docs/5.3/forms/layout))
- [Form Validation States](https://awesome-repositories.com/f/web-development/form-handling/form-validation-states.md) — Toggles CSS classes based on input state to provide visual feedback for valid or invalid form submissions. ([source](https://getbootstrap.com/docs/5.3/forms/validation))
- [Heading Styles](https://awesome-repositories.com/f/web-development/web-standards/typography-systems/heading-styles.md) — Applies consistent font sizes and weights to heading elements with options for secondary text integration to maintain visual hierarchy. ([source](https://getbootstrap.com/docs/5.3/content/typography))
- [Normalize-Based Browser Resets](https://awesome-repositories.com/f/web-development/browser-integration-utilities/browser-infrastructure/normalize-based-browser-resets.md) — Browser-specific defaults are overridden to establish a consistent rendering baseline across diverse environments.
- [Precompiled Asset Distributions](https://awesome-repositories.com/f/web-development/web-infrastructure-deployment/asset-management-build-tools/precompiled-asset-distributions.md) — Precompiled CSS and JavaScript bundles allow immediate integration of UI components without requiring a local build pipeline. ([source](https://getbootstrap.com/docs/5.3/getting-started/contents))
- [Responsive Typography](https://awesome-repositories.com/f/web-development/web-standards/typography-systems/responsive-typography.md) — Fluid typography scales font sizes automatically based on viewport width using pre-configured variables and mixins. ([source](https://getbootstrap.com/docs/5.3/content/typography))

### Development Tools & Productivity

- [Accessibility Compliance](https://awesome-repositories.com/f/development-tools-productivity/code-quality-analysis/quality-governance-systems/accessibility-compliance.md) — Supports accessibility through structural markup, high-contrast color standards, and reduced-motion settings. ([source](https://getbootstrap.com/docs/5.3/getting-started/accessibility))
- [Build Tool Integrations](https://awesome-repositories.com/f/development-tools-productivity/workflow-automation-tools/build-task-automation/build-tool-integrations.md) — Integrates into module-based development workflows by configuring standard build tools to process and compile project assets for production. ([source](https://getbootstrap.com/docs/5.3/getting-started/vite))
- [Sass Build Optimizations](https://awesome-repositories.com/f/development-tools-productivity/build-tooling/build-orchestration-logic/build-orchestration-configuration/build-automation-systems/build-tools/module-bundlers/sass-build-optimizations.md) — Modular Sass imports allow developers to include only necessary components, reducing final CSS file size by excluding unused styles. ([source](https://getbootstrap.com/docs/5.3/customize/optimize))

### Software Engineering & Architecture

- [Browser Style Resets](https://awesome-repositories.com/f/software-engineering-architecture/software-architecture/architectural-patterns/layering-presentation/application-layer-architectures/browser-style-resets.md) — Normalizes browser defaults with a standardized base stylesheet to ensure consistent rendering across environments. ([source](https://getbootstrap.com/docs/5.3/))
- [Source Customization](https://awesome-repositories.com/f/software-engineering-architecture/application-frameworks/application-framework-extensions/plugin-development-kits/source-customization.md) — Facilitates deep customization through modular source code extensions and preprocessor variable overrides. ([source](https://getbootstrap.com/docs/5.3/getting-started/contents))

### Part of an Awesome List

- [General Purpose Frameworks](https://awesome-repositories.com/f/awesome-lists/devtools/general-purpose-frameworks.md) — Popular framework for responsive mobile-first web development.
- [Programming Languages](https://awesome-repositories.com/f/awesome-lists/devtools/programming-languages.md) — Framework for responsive, mobile-first web development.
- [User Interface](https://awesome-repositories.com/f/awesome-lists/devtools/user-interface.md) — Responsive, mobile-first web UI framework.
- [Web Frameworks](https://awesome-repositories.com/f/awesome-lists/devtools/web-frameworks.md) — Popular framework for responsive, mobile-first web development.