Highlights

• Tooltips and popovers can have custom clases via customClass option.
• Added new .navbar-nav-scroll class for scrolling expanded navbar contents on mobile devices.
• For improved accessibiliy, spinners now slow down when prefers-reduced-motion is enabled.
• v4.x docs are now built on Hugo for easier maintenance and backports from v5.x.
• Darkened background-color of .dropdown-item for improved hover state contrast, and ligthened the disabled .dropdown-item color.
• Improved alignment of form validation tooltips.
• File inputs no longer extend beyond their containers.

CSS

• #31557: Fix form validation tooltip alignment
• #31657: Handle the Ubuntu sans-serif case
• #31700: Suppress flexbox side effects in breadcrumb
• #31882: Slow down spinners when prefers-reduced-motion
• #31886: Fixed: Undefined mixin "deprecate" when importing "bootstrap-grid-scss"
• #32141: Use correct value order
• #32145: Avoid invisible real file input "spilling" out of container
• #32160: Add overflow suppression to custom file label
• #32211: Move negative margin-bottom from .nav-item to .nav-link
• #32212: Remove needless Stylelint disables
• #32833: Add .navbar-nav-scroll for vertical scrolling of navbar content
• Add two new variables for pagination border-radius values; backport of #32423
• Remove old/unnecessary reboot bug fix; backport of #32631
• Suppress focus outline for buttons when it shouldn't be visible in Chromium; backport of #32689
• Consistently use outline:0 rather than outline:none; backport of #32751
• Darken dropdown item hover style; backport of #32754
• Lighten disabled dropdown text to $gray-500

JS

• #31820: Check for data-interval on the first slide of carousel
• #31834/#32225: tooltip/popover: add a customClass option
• #32001: Move js/src/index.js one folder up
• #32045: tests: fix sanitizer test
• #32220: Don't hide modal when config.keyboard is false
• #32312: build-plugins: switch to "bundled" for babel helpers

Docs

• #31861: Split up dropdown sizing docs to improve rendering
• #31892: Remove redundant visually hidden "(current)" from pagination controls
• #31893: manifest.json: Switch to relative URLs so that we don't need to change the path with every major/minor release
• #31898: switch to suggesting jsDelivr as a CDN
• #31904:
  • docs(forms): use a legend for fieldset instead of aria-label
  • docs(forms): fix incorrect legend nesting in fieldset
• #31936: forms: change inline custom radio name
• #31951: Update anchor-js to v4.3.0
• #31960: Explicitly mention emoji fonts, tweak sentence in typography
• #31981: list-group.md: fix snippet
• #32005: Remove bugreport.apple.com since it doesn't work
• #32015: Fix redirects
• #32050: Make docs anchorjs links darker on keyboard focus
• #32054: Add callouts about using light colors ideally on a dark background
• #32077: Switch to Hugo
• #32083: mention "Liberation Sans"
• #32087: download.md: link to JS files comparison too
• #32094: Changes to navbar documentation/explanation
• #32106: Clarify JS bundle docs once more for v4
• #32137: input-group.md: fix wrong class .visually-hidden
• #32138: navbar.md: remove loading=lazy from snippets
• #32147: Fix caniuse.com redirects
• #32151: Mention user-select-all support in docs
• #32196: homepage: split snippets and show copy buttons
• #32203: Switch to jsDelivr for the remaining docs assets
• #32223: introduction: split comments
• #32247: Fix typos in tooltip/popover docs
• #32253: Add Russian translation
• #32363: Remove useless .text-left in Layout / Overview
• #32399: Remove duplicated "follow Bootstrap on Twitter" link in Community section
• #32457: Add mention of the bs-custom-file-input plugin needed for the custom file input
• #32461: style clipboard button on :focus, not just :hover
• #32462: Replace Lorem Ipsum placeholder text with more representative (or at least english language) text
• #32634: Remove incorrect mention of dropdowns for dynamic tab behavior
• #32639: v4: Add an actual data-touch="false" example in the carousel docs
• #32728: add v5.0 in versions
• #32761: Mention stretched-link constraints with table elements
• #32789: Remove role="button" from CTA links in carousel example
• #32791: Docs v4: Sass implementation and rounding precision
• #32809:
  • Clarify Sass import and customize docs for how to modify variable defaults
  • Add an npm starter project callout to a few pages
• #32827: Add a live toast example to the docs
• #32759: Mention CSP and embedded SVGs in v4 docs
• docs(dropdowns): clarify where is .show applied
• Require .has-validation for input groups with validation
• Fix mobile menu jump & double border
• Remove double spaces from homepage SVGs
• browserconfig.xml: switch to relative image path
• Tweak the wording for collapse to indicate button is preferred/more semantic; backport of #32632
• Clarify the $enable-shadows option in our docs; backport of #32685

Examples

• #31979: v4 Examples/Floating-labels: fix bad behavior with autofill
• #32198: examples: add the version number in title

Misc

• #29753: Improve build/generate-sri.js regex
• #32003: CI: switch to Node.js 14
• #32008: Update Edge's Rendering Engine on CONTRIBUTING.md
• #32486: BrowserStack: test on macOS Catalina instead of High Sierra
• #32756: Stylelint: disallow some property values
• Fix for npm 7.x package.json: move version_short variable under the config object; backport of #32737
• Update build-examples script so that the resulting examples zip file includes only the needed files
• Various CI tweaks
• Updated devDependencies