🚀 Features

• #34052: Automatically select an item in the dropdown when using arrow keys

🎨 CSS

• #33621: Allow individual grid classes to override .row-cols
• #34008: Fix x-paddings for select (with floating label, and in Firefox)
• #34026: Set the correct color for popover header bottom border
• #34034: Add missing transition to .form-select
• #34044: Fix wrong comment text for tooltip
• #34047: Handle complex expressions in add() & subtract()
• #34048: Decouple --bs-table-bg and --bs-table-accent-bg
• #34062: Document how to make utilities responsive using the API
• #34124: fix(dropdowns): RTL for .dropdown-menu-*
• #34161: fix(forms): unitless line-height for floating labels
• #34223: docs(style): fix display of nested <ul><li>
• #34245: Replace / division with multiplication and custom divide() function
• #34255: Don't set auto margin on offcanvas close
• #34281: Fix lingering Sass math
• #34283: Update the divide() function and RFS
• #34332: Fix another Sass division

☕️ JavaScript

• #33276: Add getOrCreateInstance method in base-component
• #33371: Popover & Tooltip: Allow dispose/hide methods usage through jQueryIntreface
• #33608: Utils: add getNextActiveElement helper function
• #33845: Fix handling of transitionend events dispatched by nested elements
• #33928: Reset inside a Dialog does not work if data-dismiss="modal" is set
• #33947: Refactor scrollbar.js to be used as a Class
• #33948: Add tests for scrollbar.js & better handling if a style property doesn't exist
• #33960: fix isVisible false positives from deep nesting or alternate means
• #33982: Don't add empty content holder when there is no content available
• #34014: Fix backdrop "Cannot read property 'removeChild' of null" when removed from body
• #34052: Automatically select an item in the dropdown when using arrow keys
• #34070: Fix test of #34014
• #34071: Change element.parentNode.removeChild(element) to element.remove()
• #34085: Fix prevented show event disables modals with fade class from being displayed again
• #34092: Backdrop: Fix stale body by removing unnecessary default
• #34158: Register only one DOMContentLoaded event listener in onDOMContentLoaded
• #34266: Fix carousel buttons
• #34307: fix(carousel): arrow keys break animation if carousel sliding

📖 Docs

• #33724: Nav-tabs documentation example: Adjust example to querySelectorAll
• #33749: add Bootstrap 5 Simplified Chinese translation
• #34009: Drop BlinkMacSystemFont in docs
• #34018: Adjusted z-index to cover "copy" buttons
• #34040: Placeholder changes to input value in readonly input.
• #34044: Fix wrong comment text for tooltip
• #34050: Replace Freenode with Libera IRC server
• #34062: Document how to make utilities responsive using the API
• #34074: Update Hugo config and sitemap.xml
• #34090: Change HTTP to HTTPS
• #34143: Add positioned badges example to docs
• #34160: img in horizontal card
• #34175: Fix typo in sass.md ("theses"→ "these")
• #34179: Missed explanations for variables override
• #34180: docs: update dropdowns.md to reflect the correct version
• #34183: docs: update migration.md to fix a typo
• #34199: docs: update overview.md to fix typo
• #34223: docs(style): fix display of nested <ul><li>
• #34239: fix(docs): update docs to match the newest modal-open removal
• #34251: Document the change to breakpoint mixins
• #34256: Add important to utilities, mention it's usage and global variable
• #34263: Fix error in JavaScript doc example
• #34280: Remove a leftover sass:math module call

🛠 Examples

• #34007: Dashboard example improvements
• #34011: Cheatsheet: fix JS errors in setActiveItem()
• #34214: fix accessibility issue on sidebars example

🌎 Accessibility

• #34052: Automatically select an item in the dropdown when using arrow keys
• #34214: fix accessibility issue on sidebars example

🔧 Utility API

• #34062: Document how to make utilities responsive using the API
• #34256: Add important to utilities, mention it's usage and global variable

🏭 Tests

• #33948: Add tests for scrollbar.js & better handling if a style property doesn't exist

🧰 Misc

• #34075: Improve vnu-jar.js
• #34250: Replace Freenode with Libera.Chat in the remaining files
• #34279: build/vnu-jar.js: clean up ignores

📦 Dependencies

• Updated numerous devDependencies: https://github.com/twbs/bootstrap/pulls?q=is%3Apr+is%3Aclosed+label%3Adependencies+project%3Atwbs%2Fbootstrap%2F41