Update migration guide

Fix border radius for inputs groups with validation

Fix border radii on validation messages

Require `.has-validation` class to fix border radii on form elements

CI: allow skipping BrowserStack (#31878)

This basically brings back the previous behavior we had on Travis CI, where if the commit message included `[ci skip]`, BrowserStack tests didn't run.

Additionally, this allows skipping BrowserStack if the commit message contains `[skip ci]` too.

docs: Add Russian translation (#31828)

Remove background-clip from .btn-close

Update CodeQL action (#31930)

Should run on PRs too.

Rename Navs to Navs and Tabs (#31965)

* Rename Navs to Navs and Tabs

Fixes #31378

* Add title to renamed file
* Update navs-tabs.md
* Add alias/redirect
* Fix references to renamed file, tweak title

Co-authored-by: Patrick H. Lauke <redux@splintered.co.uk>

Explicitly mention emoji fonts, tweak sentence in typography (#31960)

Don't wrap the code snippets in our docs (#31679)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Update anchor-js to v4.3.0. (#31951)

Move `href` attribute first (#31835)

Update bs-table shortcode (#31803)

Handle the Ubuntu sans-serif case (#31657)

On Ubuntu, our native font-stack doesn't output the same font on Firefox and Chrome. This is [a known aliasing issue](http://fontfamily.io/sans-serif) — check at the bottom, Ubuntu 14.04. Ubuntu 18.04 (my current) doesn't use the same (Firefox uses Liberation Sans, Chrome uses the default system font Ubuntu).

I'm inclined to prefer Liberation Sans since it's closer to Arial / Helvetica. This patch already exists in Boosted, didn't notice it was missing in bootstrap until today…

BTW, our linked Smashing Magazine's system fonts post mentions this and is even more accurate since it targets the three major Linux distributions. AFAIK this is not needed since [Liberation Sans is available everywhere](http://fontfamily.io/Liberation_Sans) — but we might go back to `Oxygen, Ubuntu, Cantarell`if we want to stick to system fonts.

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Bump nodemon from 2.0.5 to 2.0.6 (#31939)

Bumps [nodemon](https://github.com/remy/nodemon) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](https://github.com/remy/nodemon/compare/v2.0.5...v2.0.6)

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Update optimize.md

For some weird reason, using "Exports" as the callout header leads to TypeError coming from clipboard.js

mention default export in our docs optimize section

Update docs example on how to optimize JavaScript bundle

Pin terser to v5.1.0 and regenerate package-lock.json (#31928)

Small typo - remove the unnecessary "the" (#31932)

docs: switch to fenced codeblocks (#31806)

docs(migration): mention spinners slow down (#31929)

Apply smooth-scroll when `prefers-reduced-motion: no-preference` (#31877)

* feat(reboot): apply smooth-scroll when not prefers-reduced-motion

* docs(migration): mention scroll-behavior in alpha3

* docs(accessibility): mention scroll-behavior in reduced motion section

* docs(accessibility): rewording smooth scroll sentence

* feat(variable): introduce enable-smooth-scroll variable

* docs(accessibility): reword smooth-scroll sentence

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Slow down spinners when `prefers-reduced-motion: reduce` (#31882)

* feature(spinners): slow down spinners when prefers-reduced-motion

* docs(spinners): add reduced motion callout and mention slowing down in accessibility page

* Update spinners.md

* docs(accessibility): rewording

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Patrick H. Lauke <redux@splintered.co.uk>

docs(forms): use a legend for fieldset instead of aria-label

docs(forms): fix incorrect legend nesting in fieldset

docs(forms): drop useless text faking a label in horizontal forms example

docs: switch to suggesting jsDelivr as a CDN (#31894)

Bump eslint-config-xo from 0.32.1 to 0.33.1 (#31925)

Bumps [eslint-config-xo](https://github.com/xojs/eslint-config-xo) from 0.32.1 to 0.33.1.
- [Release notes](https://github.com/xojs/eslint-config-xo/releases)
- [Commits](https://github.com/xojs/eslint-config-xo/compare/v0.32.1...v0.33.1)

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Bump eslint-plugin-unicorn from 22.0.0 to 23.0.0 (#31921)

Bumps [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn) from 22.0.0 to 23.0.0.
- [Release notes](https://github.com/sindresorhus/eslint-plugin-unicorn/releases)
- [Commits](https://github.com/sindresorhus/eslint-plugin-unicorn/compare/v22.0.0...v23.0.0)

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Bump @babel/core from 7.11.6 to 7.12.3 (#31927)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.11.6 to 7.12.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.3/packages/babel-core)

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Bump @babel/cli from 7.11.6 to 7.12.1 (#31926)

Bumps [@babel/cli](https://github.com/babel/babel/tree/HEAD/packages/babel-cli) from 7.11.6 to 7.12.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.1/packages/babel-cli)

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Bump @babel/preset-env from 7.11.5 to 7.12.1 (#31923)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.11.5 to 7.12.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.1/packages/babel-preset-env)

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Bump nodemon from 2.0.4 to 2.0.5 (#31924)

Bumps [nodemon](https://github.com/remy/nodemon) from 2.0.4 to 2.0.5.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](https://github.com/remy/nodemon/compare/v2.0.4...v2.0.5)

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Bump linkinator from 2.1.3 to 2.2.0 (#31922)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 2.1.3 to 2.2.0.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](https://github.com/JustinBeckwith/linkinator/compare/v2.1.3...v2.2.0)

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Bump rollup from 2.29.0 to 2.32.0 (#31920)

Bumps [rollup](https://github.com/rollup/rollup) from 2.29.0 to 2.32.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.29.0...v2.32.0)

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Bump hugo-bin from 0.64.4 to 0.64.5 (#31919)

Bumps [hugo-bin](https://github.com/fenneclab/hugo-bin) from 0.64.4 to 0.64.5.
- [Release notes](https://github.com/fenneclab/hugo-bin/releases)
- [Commits](https://github.com/fenneclab/hugo-bin/compare/v0.64.4...v0.64.5)

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Bump sirv-cli from 1.0.6 to 1.0.8 (#31918)

Bumps [sirv-cli](https://github.com/lukeed/sirv) from 1.0.6 to 1.0.8.
- [Release notes](https://github.com/lukeed/sirv/releases)
- [Commits](https://github.com/lukeed/sirv/compare/v1.0.6...v1.0.8)

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Update manifest.json (#31893)

Switch to relative URLs so that we don't need to change the path with every major/minor release

Remove redundant visually hidden "(current)" from pagination controls (#31892)

* Replace visually hidden span with aria-current in tests

* Remove redundant visually hidden "(current)" when `aria-current` already used

Closes #31891

Update copy and add utilities to example

Adding overflow visible as util

Revert "Improve callout shortcode. (#31802)" (#31871)

This reverts commit 5c6925385ee926a749ead6a4f2ebbfc64e701f36.

Split up dropdown sizing docs to improve rendering (#31861)

- Drop the included .btn-toolbar, no need
- Split large and small button examples

Closes #31841

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Bump hugo-bin from 0.63.1 to 0.64.4 (#31872)

Bumps [hugo-bin](https://github.com/fenneclab/hugo-bin) from 0.63.1 to 0.64.4.
- [Release notes](https://github.com/fenneclab/hugo-bin/releases)
- [Commits](https://github.com/fenneclab/hugo-bin/compare/v0.63.1...v0.64.4)

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Bump rollup from 2.28.2 to 2.29.0 (#31875)

Bumps [rollup](https://github.com/rollup/rollup) from 2.28.2 to 2.29.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.28.2...v2.29.0)

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Bump eslint from 7.10.0 to 7.11.0 (#31873)

Bumps [eslint](https://github.com/eslint/eslint) from 7.10.0 to 7.11.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.10.0...v7.11.0)

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Colors rewrite (#30622)

Improve callout shortcode. (#31802)

Remove the `markdownify` call, and instead rely on Hugo's proper syntax; `{{% callout %}}` when we want to the content to be processed as Markdown.

This allows for stuff like:

{{% callout info %}}
##### I'm an info callout!

```css
.foo {
  color: #fff;
}
```

{{< example >}}
<div class="alert alert-warning alert-dismissible fade show" role="alert">
  <strong>Holy guacamole!</strong> You should check in on some of those fields below.
  <button type="button" class="btn-close" data-dismiss="alert" aria-label="Close"></button>
</div>
{{< /example >}}
{{% /callout %}}

Alert : Added z-index for close button (#31826)

Co-authored-by: Ankit Mishra <ankitmishra@Ankit-MacBook-Pro.local>
Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>

Bump linkinator from 2.1.2 to 2.1.3 (#31843)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](https://github.com/JustinBeckwith/linkinator/compare/v2.1.2...v2.1.3)

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Remove `Manipulator.toggleClass` (#31842)

It's only used in one place so it makes more sense to remove it for the time being.

docs: fix contrast color against `.bg-info` (#31839)

* docs(badge): ensure info badge's contrast

* docs(colors): fix contrasts in example using .bg-info

* Update card.md

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

carousel: add missing `to` description and fix `nextwhenvisible` description (#31809)

Explain the "dispose" method appropriately (#30838)

Update btn-close-white docs to filter (not backdrop-filter) (#31796)

This PR fixes an error in the v5 docs. The btn-close-white class actually uses the filter (not backdrop-filter)

webpack.md: Replace "both of them" with "it" (#31794)

:tada: Yay! I helped!

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

validation.md: fix _validation.scss file reference (#31795)

Add Sass variable for CSS variable prefix (#31684)

* Add Sass variable for CSS variable prefix

* Update other --bs-* var instances

feat(colors): bump dark to gray-900 (#30550)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

docs(Modal): Add xxl fullscreen example (#31583)

* docs(Modal): Add xxl fullscreen example

* Update modal.md

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Fix disabled checkbox toggle buttons (#31651)

* fix disabled checkbox toggle buttons

* add disabled checks-radios examples in documentation

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

v5: Add disabled examples for .form-control, .form-select, and .form-range (#31686)

* Add disabled state example to the .form-control page

* Document disabled attribute on select too

* Add disabled example for file input

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Suppress flexbox side effects in breadcrumb (#31700)

* Suppress flexbox side effects

* Trailing whitesapce

Co-authored-by: Mark Otto <markd.otto@gmail.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Update .gitignore (#31783)

Add vscode and netlify folders

Update social.html: use `article` when it's a page (#31775)

docs: remove pixels from SVGs (#31791)

It's the default unit.

Prepare v5.0.0-alpha2. (#31748)

Revert #31761 (#31792)

Revert "Re-optimize SVG"

This reverts commit 331566bc85f7c0009e5a16b84d97f99c12d3a1c1.

Revert "Move homepage-hero.svg to an img tag"

This reverts commit c24acf8d2cca8e94a4115d7c30a281de23882789.

Change grid classes to utilities to make vertical nav example more resilient to narrow viewports (#31785)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Compress the new images

Add new Bootstrap Icons homepage images

Replace ellipsis Unicode symbol with three dots. (#31774)

Update stylelint to v13.7.2 (#31726)

Bump eslint-plugin-import from 2.22.0 to 2.22.1 (#31781)

Bumps [eslint-plugin-import](https://github.com/benmosher/eslint-plugin-import) from 2.22.0 to 2.22.1.
- [Release notes](https://github.com/benmosher/eslint-plugin-import/releases)
- [Changelog](https://github.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](https://github.com/benmosher/eslint-plugin-import/compare/v2.22.0...v2.22.1)

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Bump rollup from 2.28.1 to 2.28.2 (#31779)

Bumps [rollup](https://github.com/rollup/rollup) from 2.28.1 to 2.28.2.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.28.1...v2.28.2)

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Bump eslint from 7.9.0 to 7.10.0 (#31778)

Bumps [eslint](https://github.com/eslint/eslint) from 7.9.0 to 7.10.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.9.0...v7.10.0)

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Bump karma from 5.2.2 to 5.2.3 (#31777)

Bumps [karma](https://github.com/karma-runner/karma) from 5.2.2 to 5.2.3.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v5.2.2...v5.2.3)

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Bump bundlewatch from 0.3.0 to 0.3.1 (#31776)

Bumps [bundlewatch](https://github.com/bundlewatch/bundlewatch) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/bundlewatch/bundlewatch/releases)
- [Commits](https://github.com/bundlewatch/bundlewatch/compare/v0.3.0...v0.3.1)

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_variables: change $btn-close-bg's attribute order (#31772)

Just to save a few bytes from the compressed files.

Tweak versions page columns (#31754)

Re-optimize SVG

Move homepage-hero.svg to an img tag

Minor wording fixes

Fix links

v5 alpha 2 migration guide updates

Convert SVGs in navbar and subnav to pixels (#31767)

brand: minor consistency changes (#31750)

v5: Adjust docs sidebar and navbar (#31119)

* Hide the docs nav on mobile, redesign it for two columns on narrow devices

* Tweak spacing on ToC

* Redesign sidebar and subnav

* Revamp subnav mobile layout so everything's on one line

* Tighten up masthead a little

* Switch the icon for the subnav and do a little icon toggling

* Fix mobile overflow since we changed guters stuff

* Add the widths

* make the subnav icon purple

Restore `rem` unit (#31746)

Fix unintentional unit change in https://github.com/twbs/bootstrap/commit/1af79bbc5267428af9fcb4a8fc9e6ab0b30328f4#diff-d8ee409a461718bfb6240710c8c73382

Fix bundlewatch test I missed

Carousel enhancements, including .carousel-dark (#31650)

* Replace existing carousel control icons with chevrons from Bootstrap Icons

* Add .carousel-dark variant

* Test

* Add variable for .carousel-dark filter

* Update _variables.scss

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

docs: link to the Asynchronous functions section (#31738)

README.md: show brotli size too (#31259)

Add .dropdown-menu-dark (#30171)

* Add .dropdown-menu-dark

* Match background color to navbar dark

* Update docs to include a navbar example

* Update dropdowns.md

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

fix tooltip hide method when already hidden (#31115)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

Forgot to divide by 2

Match container gutters with row gutters

- Replaces make-container mixin's padding-x param with gutter to match naming
- Changes value of container padding variable to match grid gutter width variable
- Uses local CSS variable for container padding

Fixes #31642

Updates to .ratio selectors and docs

- Remove group selector for ratio items
- Drop the .ratio-item entirely
- Update docs to explain updated approach
- Update Migration guide to reflect the latest