chaitin/bootstrap-helper

Bootstrap Helper

什么时候用

• 要使用 Bootstrap 5.3 构建 Web 前端 UI 或布局
• 需要查找特定组件（如 modal、navbar、card 等）的用法
• 实现表单、导航、下拉菜单等交互功能
• 定制 Bootstrap 主题、颜色或响应式断点
• 排查 Bootstrap 与其他库的集成问题

必须先看文档

1. 确定需求 - 明确你需要什么组件或功能（例如：按钮、模态框、表单验证）
2. 查阅文档分类 - 在下方的「文档目录索引」中找到对应类别的文档
3. 定位具体文件 - 根据分类中的文件名，在 references/ 目录中找到对应文档
4. 阅读文档内容 - 使用 read 工具查看完整文档，理解后再实现
5. 参考示例代码 - 文档中包含完整的 HTML/CSS/JavaScript 示例

Bootstrap 简介

Bootstrap 是最流行的 Web 前端开发框架，用于快速构建响应式、移动设备优先的网站和应用。它包含：

• 预构建组件 - 按钮、导航栏、卡片、模态框等
• 响应式网格系统 - 灵活的 12 列布局
• 强大的插件 - JavaScript 交互组件
• 样式和工具类 - 丰富的 CSS 样式和实用工具

文档分类速查

示例 1：使用 Modal 组件

1. 在「文档目录索引」里找到 docs-5.3-components-modal.md
2. 使用 read 工具阅读该文档
3. 理解 HTML 结构和 data 属性配置
4. 查看初始化代码和可用方法
5. 根据示例代码实现并修改内容和样式

示例 2：构建响应式导航栏

1. 在「文档目录索引」里找到 docs-5.3-components-navbar.md
2. 使用 read 工具阅读该文档
3. 理解不同响应式变体的实现方式
4. 如需网格布局，查阅 docs-5.3-layout-grid.md
5. 根据示例代码添加下拉菜单和折叠功能
6. 测试移动端和桌面端显示效果

文档目录索引

./references/docs-5.3-components-accordion.md

• JavaScript Initialization
• Collapse Methods
• Bootstrap Collapse Plugin Usage with Data Attributes
• Collapse Options
• Collapse Events

./references/docs-5.3-components-alerts.md

• Initialize Bootstrap Alerts with JavaScript
• HTML for Live Bootstrap Alert Demo
• Bootstrap Alerts with Multiple Icons using SVG Sprite (HTML)
• Bootstrap Alert with Single Icon (HTML)
• Display Bootstrap Alerts in HTML

./references/docs-5.3-components-badge.md

• Positioned Bootstrap Badges (HTML)
• Bootstrap Badge Background Colors (HTML)

./references/docs-5.3-components-breadcrumb.md

• Bootstrap Breadcrumb Examples (HTML)
• Customizing Breadcrumb Dividers with CSS and Sass (HTML & Sass)

./references/docs-5.3-components-button-group.md

• Button Group with Links (HTML)
• Create Button Toolbars with Bootstrap
• Integrate Input Groups with Button Toolbars in Bootstrap
• Radio Button Group (HTML)
• Vertical Radio Button Group HTML

./references/docs-5.3-components-buttons.md

• Toggle Button States
• Bootstrap Button JavaScript Methods
• Bootstrap Button Sizes
• Toggle Button States with HTML
• Custom Bootstrap Button Variant (SCSS)
• Responsive Block Buttons
• Bootstrap Button Tags and Roles
• Create Stacked Block Buttons

./references/docs-5.3-components-card.md

• Bootstrap Card Styling Examples
• Basic Card Example with Image and Body (HTML)
• Bootstrap Card with Header and Body (HTML)
• Bootstrap Card with Blockquote (HTML)
• Bootstrap Card Basic Structure
• Bootstrap Card Header/Footer Styling
• Bootstrap Cards within Grid Columns (HTML)
• Bootstrap Card with Image, List, and Links (HTML)
• Bootstrap Card Text Alignment
• Bootstrap Card with Text Background Colors (HTML)
• Basic Bootstrap Card Layouts
• Card with Image and Text (HTML)
• Bootstrap Card with Image Overlay
• Bootstrap Card Background and Color Styles
• Card with Title, Subtitle, Text, and Links (HTML)
• Bootstrap Basic Card Layout
• Bootstrap Card with Tabbed Navigation
• Bootstrap Grid Cards Layout (HTML)
• Bootstrap Card with Footer Layout
• Card with Flush List Group and Footer (HTML)

./references/docs-5.3-components-carousel.md

• Bootstrap Carousel with Indicators HTML
• Bootstrap Carousel Basic Example HTML
• Bootstrap Carousel with Captions Example
• Initialize Bootstrap Carousel with Options
• Bootstrap Carousel: Autoplay on Page Load (HTML)
• Bootstrap Carousel with Crossfade Transition Example
• Bootstrap Carousel: Slides Only Autoplay (HTML)
• Bootstrap Carousel Dark Variant and Color Mode
• Usage

./references/docs-5.3-components-collapse.md

• Basic Collapse Example (HTML)
• Horizontal Collapse Example (HTML)
• Initialize Bootstrap Collapse via JavaScript
• Collapse Initialization and Usage
• Handle Bootstrap Collapse Hidden Event
• Collapse Methods
• Create Bootstrap Collapse Instance with Options

./references/docs-5.3-components-dropdowns.md

• Bootstrap Dropdown Alignment Examples
• Bootstrap Dropstart Dropdowns
• Bootstrap Dropdown Menu Text Example
• Bootstrap Dropend Dropdowns
• Bootstrap Dropdown Positioning with Offset and Reference
• Bootstrap Dropdown Menu Header Example
• Default and Split Dropup Buttons HTML
• Bootstrap Dropdown Menu Divider Example
• Bootstrap Dropdown Form Example
• Dark Dropdown in Navbar HTML
• Bootstrap Dropdown with Link Trigger (HTML)
• Bootstrap Dropdown Auto Close HTML Examples
• Bootstrap Large Split Button Dropdown (HTML)
• Bootstrap Dropdown Caret Sass Mixins
• Bootstrap Dropdown Menu Items
• Bootstrap Dropdown with Form Trigger
• Dropdown Options
• Configure Dropdown with popperConfig (JavaScript)
• Initialize Bootstrap Dropdowns with JavaScript

./references/docs-5.3-components-list-group.md

• Handle Tab Shown Event (JavaScript)
• Initialize Bootstrap Tab Instance (JavaScript)
• Bootstrap Horizontal List Group
• Bootstrap Numbered List Group
• Bootstrap List Group Tab Structure (HTML)
• Bootstrap List Group with Radio Buttons
• Bootstrap List Group Item Variants (HTML)
• Bootstrap List Group Action Variants (HTML)
• Basic List Group HTML
• Actionable List Group Items with Links HTML
• Bootstrap List Group with Actionable Items
• Bootstrap Responsive Horizontal List Groups
• Actionable List Group Items with Buttons HTML

./references/docs-5.3-components-modal.md

• Pass Options via JavaScript (JavaScript)
• Add Popover and Tooltip in Bootstrap Modal
• Static Bootstrap Modal Structure (HTML)
• Create Scrollable Modal Body with Bootstrap
• Initialize Modal via JavaScript (JavaScript)
• Bootstrap Grid Layout in Modal Body
• Bootstrap Responsive Fullscreen Modals
• Live Bootstrap Modal Demo with Trigger Button (HTML)

./references/docs-5.3-components-navbar.md

• Bootstrap Navbar Example
• Bootstrap Navbar Brand Examples
• Default Navbar Placement (HTML)
• Bootstrap Navbar with Text and Navigation
• Bootstrap Navbar with Form Buttons
• Bootstrap Navbar with Brand and Search Form
• Navbar with Vertical Scrolling (HTML)
• Bootstrap Navbar with Hidden Brand Toggler
• Bootstrap Dark Navbar Color Scheme
• Navbar with Responsive Container (HTML)
• Sticky Top Navbar Placement (HTML)
• Bootstrap Navbar with Image
• Navbar with Container (HTML)
• Basic Offcanvas Navbar HTML Structure
• Bootstrap Navbar with Image and Text

./references/docs-5.3-components-navs-tabs.md

• Bootstrap Pills Example
• Bootstrap Tab Instance Methods
• Bootstrap Tabs Example
• Right-Aligned Horizontal Nav (HTML)
• Bootstrap Responsive Flex Nav HTML
• Centered Horizontal Nav (HTML)
• Bootstrap Underline Navigation HTML
• Bootstrap Nav Fill Justify HTML (NAV)
• Bootstrap Pills Navigation HTML
• Bootstrap Vertical Pills Example
• Base Nav with NAV Element (HTML)
• Bootstrap Tabs with Dropdown Example (HTML)
• Select Specific Bootstrap Tabs via JavaScript
• Bootstrap Nav Fill Justify HTML (UL)
• Bootstrap Pills with Dropdown Example (HTML)
• Activating Tabs via JavaScript
• Base Nav with UL Element (HTML)
• Using Data Attributes for Tabs
• Activate Bootstrap Tabs with Data Attributes (HTML)
• Activate Bootstrap Tabs Programmatically with JavaScript
• Listen for Bootstrap Tab Shown Event (JavaScript)

./references/docs-5.3-components-offcanvas.md

• Offcanvas Placement Examples (HTML)
• Bootstrap Offcanvas Live Demo with Triggers (HTML)
• Bootstrap Dark Offcanvas Example (Deprecated)
• Offcanvas Instance Creation
• Bootstrap Offcanvas Component Example (HTML)
• Create Bootstrap Offcanvas Instance (JavaScript)
• Initialize Bootstrap Offcanvas with JavaScript
• Bootstrap Offcanvas with Scrolling and Backdrop
• Bootstrap Offcanvas with Body Scrolling Example
• Offcanvas Methods
• Dismiss Offcanvas Button (Outside)
• Dismiss Offcanvas Button (Inside)
• Bootstrap Responsive Offcanvas Classes
• Responsive Offcanvas Toggle (HTML)

./references/docs-5.3-components-pagination.md

• Bootstrap Pagination with Icons and ARIA Attributes
• Large and Small Bootstrap Pagination Sizing
• Disabled Bootstrap Pagination Item
• Basic Bootstrap Pagination HTML Structure
• Center Align Pagination with HTML
• End Align Pagination with HTML

./references/docs-5.3-components-placeholders.md

• Bootstrap Placeholder Example: Card Component
• Bootstrap Placeholder Usage: Basic and Button
• Bootstrap Placeholder Animations
• Bootstrap Placeholder Width Customization

./references/docs-5.3-components-popovers.md

• Get or Create Bootstrap Popover Instance and Set Content (JavaScript)
• Using Popper.js Configuration
• Configuring Popover Options with JavaScript (Bootstrap)
• Popover Methods
• Initialize All Popovers with JavaScript
• Popover Configuration Options
• Initialize Bootstrap Popover with JavaScript
• Handle Bootstrap Popover Hidden Event (JavaScript)
• Popover Events
• Initialize Dismissible Popover with JavaScript
• Configure Popover with Popper.js Configuration Function (JavaScript)
• Initialize Popover with Custom Container (Body)
• Create Dismissible Popover on Next Click (HTML)
• Configuring Popover Options with Data Attributes (Bootstrap)
• Implement Custom Popover with HTML
• Bootstrap Popover HTML Structure
• Bootstrap Popover Sass Variables
• Initialize Popover within Modal with Custom Container
• Popover CSS Variables Definition (SCSS)
• Customize Popover Appearance with CSS Variables (SCSS)
• Bootstrap Popover Placement Options
• Enable Popover on Disabled Button (HTML)

./references/docs-5.3-components-progress.md

• Bootstrap Progress Bar Basic Structure and Examples
• Bootstrap Stacked Progress Bars

./references/docs-5.3-components-scrollspy.md

• Bootstrap Scrollspy Navigation Example
• Bootstrap Scrollspy with Simple Anchors
• Bootstrap Scrollspy HTML Structure

./references/docs-5.3-components-spinners.md

• Bootstrap Spinners in Buttons (HTML)
• Spinner with Text using Flexbox HTML

./references/docs-5.3-components-toasts.md

• Bootstrap Live Toast Example with JavaScript Initialization
• Get or Create Toast Instance with JavaScript
• Toast with Close Button and Autohide Disabled (HTML)
• Get Toast Instance with JavaScript
• Customizing Bootstrap Toasts: Simple Layout
• Customizing Bootstrap Toasts: With Actions
• Bootstrap Toasts: Color Schemes with Utilities
• Handle Toast Hidden Event with JavaScript
• Initialize Bootstrap Toasts with JavaScript
• Toast Options
• Stacking Toasts with Bootstrap Toast Container
• Toast Methods
• Toast Accessibility with aria-live and aria-atomic (HTML)
• Configure Toast Options via Data Attributes
• Configure Toast with JSON Data Attribute

./references/docs-5.3-components-tooltips.md

• Bootstrap Tooltip Placement Examples (HTML)
• Bootstrap Tooltip HTML Structure Example
• Get Tooltip Instance and Use setContent Method
• Configure Tooltip Options with JavaScript (JavaScript)
• Initialize Tooltip with Popper.js Configuration
• Initialize Bootstrap Tooltip via JavaScript
• Initialize All Tooltips with JavaScript
• Custom Tooltip Styling with CSS Variables
• Bootstrap Tooltip Event Handling in JavaScript
• Tooltip Configuration Options
• Configure Tooltip Options with Data Attributes (HTML)
• Bootstrap Tooltip Boundary Option (JavaScript)

./references/docs-5.3-content-figures.md

• Aligned Figure Caption (HTML)

./references/docs-5.3-content-images.md

• Bootstrap Responsive Images

./references/docs-5.3-content-reboot.md

• Example Link (HTML)
• Example Paragraph (HTML)
• Indicating Sample Output with <samp>
• HTML Example of Hidden Input Element
• Styling Tables with Bootstrap
• Horizontal Rules (HTML)
• Indicating User Input with <kbd>
• Displaying Code Blocks with <pre>
• Indicating Variables with <var>

./references/docs-5.3-content-tables.md

• Bootstrap Striped and Hoverable Table
• Bootstrap Bordered Table
• Bootstrap Table: Nesting Tables
• Bootstrap Table: Small Tables
• Bootstrap Table Variants and Row/Cell Coloring
• Bootstrap Responsive Table

./references/docs-5.3-content-typography.md

• Description List Alignment Example (HTML)
• Inline List Example (HTML)
• Unstyled List Example (HTML)
• Bootstrap Lead Paragraph HTML Example
• Implementing Basic Blockquotes
• Displaying Abbreviations with Tooltips
• Styling Inline Text Elements with HTML Tags
• Blockquotes with Attribution
• Styling Inline Text Elements with Bootstrap Classes

./references/docs-5.3-customize-color.md

• Sass Example: Using Color Variables
• Apply Subtle Primary Background and Border with Text Emphasis

./references/docs-5.3-customize-color-modes.md

• Enable Dark Mode with HTML Data Attribute

./references/docs-5.3-customize-css-variables.md

• Bootstrap CSS Variables for Page Styles

./references/docs-5.3-customize-sass.md

• Importing Specific Bootstrap Sass Parts
• Compiling Sass with the Sass CLI
• Bootstrap Sass File Structure Example (Manual Download)
• Bootstrap Sass File Structure Example
• Importing All of Bootstrap Sass

./references/docs-5.3-examples-masonry.md

• Integrate Masonry with Bootstrap Grid and Cards
• Include Masonry JavaScript Plugin via CDN

./references/docs-5.3-forms-checks-radios.md

• Bootstrap Checkbox Examples (HTML)
• Bootstrap Radio Examples (HTML)
• Bootstrap Default Stacked Checkboxes
• Bootstrap Disabled Radio Examples (HTML)
• Bootstrap Default Stacked Radios
• Bootstrap Disabled Checkbox Examples (HTML)
• Bootstrap Outlined Styles HTML
• Bootstrap Radio Toggle Buttons HTML
• Bootstrap Switch Checkbox Markup
• Bootstrap Checkbox Toggle Buttons
• Inline Checkboxes and Radios with Bootstrap
• Reversed Form Controls with Bootstrap

./references/docs-5.3-forms-floating-labels.md

• Bootstrap Floating Input Group HTML
• Floating Labels for Textareas in Bootstrap HTML
• Bootstrap Floating Form Layout HTML
• Bootstrap Floating Plaintext Input HTML

./references/docs-5.3-forms-form-control.md

• Bootstrap File Input Examples
• Bootstrap Datalist Example
• Basic Form Controls Example (HTML)
• Inline Form Text Example (HTML)
• Disabled Form Controls (HTML)
• Form Control Sizing (HTML)
• Form Text with Help Block (HTML)

./references/docs-5.3-forms-input-group.md

• Bootstrap Input Group Basic Examples
• Bootstrap Input Group Sizing Examples
• Bootstrap Input Group with Multiple Addons
• Bootstrap Input Group Border Radius Example
• Bootstrap Input Group Wrapping Example
• Bootstrap Input Group with Dropdown Button (HTML)
• Bootstrap Segmented Button Group with Dropdown (HTML)
• Bootstrap Input Group with Button Addons

./references/docs-5.3-forms-layout.md

• Bootstrap Grid Column Sizing Examples
• Complex Form Layout with Grid System (HTML)
• Bootstrap Auto-Sizing Form Example (HTML)
• Bootstrap Size-Specific Column Form (HTML)
• Bootstrap Inline Form Example (HTML)
• Basic Form Layout with Margin Utilities (HTML)

./references/docs-5.3-forms-overview.md

• Basic Form Example with Bootstrap
• Form Accessibility Techniques in HTML

./references/docs-5.3-forms-range.md

• Range Input with Output Value Display (HTML & JS)

./references/docs-5.3-forms-select.md

• Bootstrap Select SCSS Variables

./references/docs-5.3-forms-validation.md

• Bootstrap Form Validation Tooltips Example (HTML)
• Bootstrap Server-Side Form Validation Example (HTML)
• Bootstrap Form Validation Example (HTML)

./references/docs-5.3-getting-started-download.md

• Install Bootstrap with NuGet
• Install Bootstrap with Bun
• Install Bootstrap with RubyGems
• Install Bootstrap with Yarn
• Install Bootstrap with Composer
• Install Bootstrap via npm
• Generate SRI Hash for Bootstrap JS
• Import Bootstrap in JavaScript (CommonJS/ES Modules)
• Include Bootstrap and Popper via CDN
• Include Bootstrap via jsDelivr CDN

./references/docs-5.3-getting-started-introduction.md

• Include Bootstrap CSS and JS via CDN
• Basic HTML Structure for Bootstrap
• Include Bootstrap JS and Popper Separately
• Viewport Meta Tag for Responsive Design in Bootstrap
• HTML5 Doctype Declaration for Bootstrap
• Overriding Box-sizing for Specific Selectors in Bootstrap

./references/docs-5.3-getting-started-javascript.md

• Initialize Bootstrap tooltips with jQuery
• Initialize Bootstrap Modal with Default and Custom Options
• Execute Action After Bootstrap Collapse Transition Completes
• Plugin Instance Methods
• Get Bootstrap Plugin Instance using getInstance
• Get or Create Bootstrap Plugin Instance using getOrCreateInstance
• Using Bootstrap as an ES Module in the Browser
• Modify default plugin settings in Bootstrap
• Bootstrap Carousel Slide Transition and Ignored Calls
• Initialize Bootstrap Components with CSS Selectors
• Modal Plugin - Dispose Method
• Plugin Static Properties
• Initializing Bootstrap Toasts with ES Modules
• Sanitizer Configuration
• Correctly dispose of Bootstrap modal instance
• Trigger Bootstrap tooltip method with jQuery
• Plugin Default Settings

./references/docs-5.3-getting-started-parcel.md

• Start Parcel Development Server
• Add Parcel npm Start Script
• Create Project Structure
• Install Bootstrap and Popper.js
• Create Project Folder and Initialize npm
• Install Parcel Development Dependency
• Configure Parcel HTML Entry Point
• Import Individual Bootstrap JS Plugins
• Import Bootstrap JavaScript in JS
• Configure Sass Deprecation Warnings
• Import Bootstrap CSS in Sass

./references/docs-5.3-getting-started-rtl.md

• RTLCSS Output Example
• RTL Bootstrap Starter Template
• Simultaneous LTR and RTL Imports with RTLCSS (Sass)

./references/docs-5.3-getting-started-vite.md

• Add npm Start Script (package.json)
• Vite HTML Entry Point (src/index.html)
• Configure Vite (vite.config.js)
• Import Bootstrap JS and CSS (src/js/main.js)
• Import Bootstrap CSS (src/scss/styles.scss)

./references/docs-5.3-getting-started-webpack.md

• Start Webpack Development Server (npm)
• Install Webpack Development Dependencies
• Install Bootstrap and Popper
• Initialize npm Project
• Create Project Structure
• Install Sass and Webpack Loaders
• Install mini-css-extract-plugin for Webpack
• Define npm Scripts for Webpack (package.json)
• Import Bootstrap JavaScript
• Create HTML Template (src/index.html)
• Configure Webpack Settings (webpack.config.js)
• Include Extracted CSS in HTML
• Configure Webpack to Extract CSS with mini-css-extract-plugin
• Configure Webpack Loaders for Bootstrap
• Configure Webpack to Extract SVG Files

./references/docs-5.3-helpers-clearfix.md

• Bootstrap Clearfix Example with Floated Buttons

./references/docs-5.3-helpers-color-background.md

• Apply Color and Background Utilities to Cards (HTML)
• Use Color and Background Utilities on Badges (HTML)
• Apply Text and Background Colors with Contrast (HTML)

./references/docs-5.3-helpers-colored-links.md

• Bootstrap Link Utilities for Customization (HTML)
• Bootstrap Link Colors with Hover States (HTML)

./references/docs-5.3-helpers-focus-ring.md

• Basic Focus Ring Example (HTML)
• Themed Focus Ring Utilities (HTML)
• Customizing Focus Ring Offset and Blur (HTML)

./references/docs-5.3-helpers-icon-link.md

• Icon Link with Bootstrap Utilities (HTML)
• Customizing Icon Link Color on Hover (HTML/CSS)

./references/docs-5.3-helpers-position.md

• Responsive Sticky Top Positioning with Bootstrap
• Responsive Sticky Bottom Positioning with Bootstrap

./references/docs-5.3-helpers-ratio.md

• Basic Ratio Example (HTML)
• Responsive Custom Aspect Ratio (SCSS)
• Predefined Aspect Ratios (HTML)

./references/docs-5.3-helpers-stacks.md

• Bootstrap Stack Example: Inline Form
• Bootstrap Stack Example: Vertical Buttons
• Bootstrap Vertical Stack (.vstack) Example
• Bootstrap Horizontal Stack (.hstack) Example
• Bootstrap Horizontal Stack with Margin Spacer

./references/docs-5.3-helpers-stretched-link.md

• Card with Stretched Links (Positioning Issues) - Bootstrap HTML

./references/docs-5.3-helpers-vertical-rule.md

• Basic Vertical Rule HTML

./references/docs-5.3-helpers-visually-hidden.md

• SCSS: Use visually hidden mixins

./references/docs-5.3-layout-breakpoints.md

• Bootstrap Sass Media Query Mixins for Responsive Layouts

./references/docs-5.3-layout-columns.md

• Bootstrap Column Wrapping Example
• Customizing Bootstrap Order Utilities with Sass
• Bootstrap Responsive Column Break with d-none d-md-block
• Bootstrap Order Classes for Visual Reordering
• Bootstrap Margin Utilities for Spacing
• Bootstrap Order-First and Order-Last Classes
• Bootstrap Responsive Floated Images with Clearfix

./references/docs-5.3-layout-containers.md

• Bootstrap Sass Mixin for Creating Custom Containers

./references/docs-5.3-layout-css-grid.md

• Column Start Alignment with CSS Grid
• Bootstrap Grid: Adding Rows and Customizing Placement
• Bootstrap Grid: Customizing Columns and Gaps
• Bootstrap Grid: Customizing Columns with CSS Variables
• Bootstrap Grid: Auto Columns Example
• Bootstrap Grid: Modifying Vertical Gaps
• Bootstrap Grid: Customizing Columns and Gaps (Mixed Widths)
• Customize Bootstrap Sass Grid with HTML Example
• Two Column Layout with CSS Grid
• Bootstrap Grid: Customizing Horizontal and Vertical Gaps
• Responsive Columns with CSS Grid

./references/docs-5.3-layout-grid.md

• Bootstrap Row Columns Examples (HTML)
• Basic Grid Layout Example (HTML)
• Bootstrap Grid Nesting Example (HTML)
• Bootstrap: Responsive Grid Classes - Mix and Match
• Bootstrap Grid Layout HTML Structure
• Bootstrap: Variable Width Content Columns
• Bootstrap: Responsive Grid Classes - All Breakpoints
• Bootstrap: Create Equal-Width Columns
• Bootstrap: Responsive Grid Classes - Stacked to Horizontal
• Bootstrap Grid Layout with Mixins (Sass)
• Customizing Bootstrap Grid Tiers (Sass)

./references/docs-5.3-layout-gutters.md

• Bootstrap Horizontal Gutters Example (HTML)
• Bootstrap Vertical Gutters Example (HTML)
• Bootstrap Row Columns with Responsive Gutters (HTML)
• Bootstrap Combined Horizontal & Vertical Gutters (HTML)

./references/docs-5.3-migration.md

• Instantiate Bootstrap Plugins with CSS Selectors (JavaScript)
• Customize Bootstrap Text and Background Colors with Opacity Utilities
• Create Layouts with Bootstrap Stack and Vertical Rule Helpers
• Implement Bootstrap's New Placeholder Component
• Add Offcanvas Drawers to Bootstrap Navbars
• Customizing Sass Maps in Bootstrap Build
• Bootstrap 5.0.0 Dependencies and Compiler Changes

./references/docs-5.3-utilities-api.md

• Add, Remove, and Modify Utilities with map-merge()
• Rename Bootstrap Utility Classes with Sass
• Enable Responsive Variations for Bootstrap Utilities with Sass
• Add Custom Bootstrap Utilities with Sass
• Override Bootstrap Utilities with Sass
• Generate Visibility Utilities with Sass (Null Class)
• Generate Responsive Utilities Across Breakpoints
• Generate Local CSS Variables for Utility Rulesets
• Generate Print-Specific Utility Classes
• Utility API Configuration
• Generate Pseudo-Class Variations with States Option

./references/docs-5.3-utilities-background.md

• Bootstrap: Apply Background Opacity with Utility Classes

./references/docs-5.3-utilities-borders.md

• Set Border Width using Bootstrap Utilities
• Add or Remove Borders using Bootstrap Utilities
• Control Border Opacity with Bootstrap Utilities
• Apply Border Radius with Sass Mixins (SCSS)

./references/docs-5.3-utilities-colors.md

• Bootstrap Text Color CSS Variable Example (CSS)
• Bootstrap Text Opacity Utilities (HTML)

./references/docs-5.3-utilities-display.md

• Bootstrap HTML: Inline Display Example
• Bootstrap HTML: Responsive Hiding Example
• Bootstrap HTML: Print Display Examples
• Bootstrap HTML: Block Display Example
• Bootstrap SCSS: Display Utilities API Configuration

./references/docs-5.3-utilities-flex.md

• Control Flex Item Growth with flex-grow Utilities (HTML)
• Control Flex Item Shrinking with flex-shrink Utilities (HTML)
• Align Flex Items with align-self Utilities (HTML)
• Control Flex Item Spacing with Auto Margins (HTML)
• Align Items with Bootstrap Flexbox Utilities
• Justify Content with Bootstrap Flexbox Utilities
• Bootstrap Media Object Component
• Enable Flexbox Container (HTML)
• Flex Item Wrapping with flex-wrap Utilities
• Enable Inline Flexbox Container (HTML)

./references/docs-5.3-utilities-float.md

• Sass Utilities API for Floats
• Responsive Float Utilities (HTML)
• Basic Float Utilities (HTML)

./references/docs-5.3-utilities-link.md

• Link Underline Hover Variants (HTML)
• Link Underline Color Utilities (HTML)
• Link Opacity Utilities (HTML)
• Link Underline Opacity Utilities (HTML)

./references/docs-5.3-utilities-object-fit.md

• Responsive Object Fit Utilities (HTML)
• Object Fit Utilities for Video (HTML)

./references/docs-5.3-utilities-opacity.md

• Apply Opacity Utilities in HTML

./references/docs-5.3-utilities-overflow.md

• Bootstrap Overflow Utilities (HTML)

./references/docs-5.3-utilities-position.md

• Bootstrap Position Utility Examples
• Bootstrap Edge Positioning Utilities
• Bootstrap Sass Position Utilities API
• Bootstrap Sass Position Values

./references/docs-5.3-utilities-shadows.md

• Bootstrap Shadow Utility Classes (HTML)

./references/docs-5.3-utilities-sizing.md

• Bootstrap Viewport Sizing Utilities (HTML)
• Bootstrap Sizing Utilities SCSS Configuration
• Bootstrap Width Utilities (HTML)

./references/docs-5.3-utilities-spacing.md

• HTML Example: Using column-gap Utility
• Row Gap Utility for Grid Layout (HTML)

./references/docs-5.3-utilities-vertical-align.md

• Bootstrap Vertical Alignment CSS Classes for Table Cells

./references/docs-5.3-utilities-z-index.md

• HTML Example for Z-index Utilities