Bootstrap: HTML, CSS, and JavaScript framework
Sass-based component library with responsive grid system.
Learn more about bootstrap
Bootstrap is a front-end framework built with HTML, CSS, and JavaScript that provides a collection of reusable components and utility classes. The framework is written in Sass and compiled to CSS, with JavaScript components handling interactive functionality like modals, dropdowns, and carousels. It uses a grid system based on flexbox and includes responsive design utilities that adapt layouts across different viewport sizes. The framework is distributed through multiple package managers including npm, Yarn, Composer, and NuGet, and is commonly used in web applications requiring consistent styling and component behavior across browsers.
Sass-Based Customization
Override variables and mixins before compilation to customize the entire framework without touching compiled CSS. Enables theme-level modifications through source files rather than CSS overrides.
Multi-Package Distribution
Available through npm, Yarn, Composer, NuGet, RubyGems, and Meteor for seamless integration across different ecosystems. Install using your existing package manager without additional tooling.
Flexbox Grid System
Provides a responsive 12-column grid system built on CSS Flexbox for predictable layouts across screen sizes. Breakpoint utilities and alignment classes enable complex responsive designs without custom CSS.
<!DOCTYPE html>
<html>
<head>
<link href="bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-4">Column 1</div>
<div class="col-md-4">Column 2</div>
<div class="col-md-4">Column 3</div>
</div>
</div>
</body>
</html>Maintenance release fixing WCAG 2.1 color contrast compliance, spinner flex distortion, and removing the Themes section from docs.
- –Update `color-contrast()` function to meet WCAG 2.1 standards; review custom theme colors for accessibility.
- –Fix spinner distortion in multiline flex containers; verify spinner layouts if using flex with wrap.
Maintenance release fixing popover/tooltip hover+click triggers and refining documentation; no breaking changes or new requirements.
- –Update code if using popover or tooltip with `trigger: "hover click"` to benefit from the behavior fix.
- –Review sanitizer and floating labels docs for clarified usage; Sass `box-shadow` mixin now outputs cleaner CSS.
Maintenance release fixing card-group inheritance and visually-hidden focus bugs; docs migrated from Hugo to Astro.
- –Update card-group selectors to target immediate children only, fixing border-radius inheritance issues.
- –Apply overflow fix to .visually-hidden to prevent child elements from becoming focusable.
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