Bump karma from 5.2.0 to 5.2.1 (#31599)

Bumps [karma](https://github.com/karma-runner/karma) from 5.2.0 to 5.2.1.
- [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/v5.2.0...v5.2.1)

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Bump eslint from 7.8.0 to 7.8.1 (#31598)

Bumps [eslint](https://github.com/eslint/eslint) from 7.8.0 to 7.8.1.
- [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/v7.8.0...v7.8.1)

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Bump @babel/cli from 7.11.5 to 7.11.6 (#31597)

Bumps [@babel/cli](https://github.com/babel/babel/tree/HEAD/packages/babel-cli) from 7.11.5 to 7.11.6.
- [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/v7.11.6/packages/babel-cli)

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Bump rollup from 2.26.9 to 2.26.10 (#31596)

Bumps [rollup](https://github.com/rollup/rollup) from 2.26.9 to 2.26.10.
- [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/v2.26.9...v2.26.10)

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Bump @babel/core from 7.11.5 to 7.11.6 (#31595)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.11.5 to 7.11.6.
- [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/v7.11.6/packages/babel-core)

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docs(placeholder): drop role=img and use aria-hidden for decorative SVG placeholders (#31575)

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docs(build tools): mention how to get the sources (#31590)

Drop h4 color customization in callouts (#31576)

Docs: Add top/bottom margin to highlighted code samples (#31036)

* Add top/bottom margin to highlighted code samples

provide more space to avoid having the "Copy" button overlap code sample content

* Modify clipboard button style

Per https://github.com/twbs/bootstrap/pull/31036#issuecomment-661322566 and https://github.com/twbs/bootstrap/pull/31036#issuecomment-668162630

* Tweak margin, clipboard button size and position

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

Fix incorrect green and cyan hex codes (#31572)

Add default parameters to each border radius mixin (#31571)

* Add default parameters to each border radius mixin

* Add border radius changes to migration guide

Co-authored-by: Jeremy Jackson <jeremy@librarymarket.com>

Regenerate package-lock.json to flatten the deps tree (#31570)

Bump eslint from 7.7.0 to 7.8.0 (#31568)

Bumps [eslint](https://github.com/eslint/eslint) from 7.7.0 to 7.8.0.
- [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/v7.7.0...v7.8.0)

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Bump rollup from 2.26.5 to 2.26.9 (#31567)

Bumps [rollup](https://github.com/rollup/rollup) from 2.26.5 to 2.26.9.
- [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/v2.26.5...v2.26.9)

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Bump postcss-cli from 7.1.1 to 7.1.2 (#31566)

Bumps [postcss-cli](https://github.com/postcss/postcss-cli) from 7.1.1 to 7.1.2.
- [Release notes](https://github.com/postcss/postcss-cli/releases)
- [Changelog](https://github.com/postcss/postcss-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss-cli/compare/7.1.1...7.1.2)

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Bump karma from 5.1.1 to 5.2.0 (#31565)

Bumps [karma](https://github.com/karma-runner/karma) from 5.1.1 to 5.2.0.
- [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/v5.1.1...v5.2.0)

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Bump @babel/cli from 7.10.5 to 7.11.5 (#31564)

Bumps [@babel/cli](https://github.com/babel/babel/tree/HEAD/packages/babel-cli) from 7.10.5 to 7.11.5.
- [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/v7.11.5/packages/babel-cli)

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Bump @babel/preset-env from 7.11.0 to 7.11.5 (#31562)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.11.0 to 7.11.5.
- [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/v7.11.5/packages/babel-preset-env)

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docs: Fix typo on Customize -> Color page (#31556)

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

Bump @babel/core from 7.11.4 to 7.11.5 (#31561)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.11.4 to 7.11.5.
- [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/v7.11.5/packages/babel-core)

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Bump linkinator from 2.1.1 to 2.1.2 (#31534)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](https://github.com/JustinBeckwith/linkinator/compare/v2.1.1...v2.1.2)

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Bump @babel/core from 7.11.1 to 7.11.4 (#31533)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.11.1 to 7.11.4.
- [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/v7.11.4/packages/babel-core)

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Bump rollup from 2.26.3 to 2.26.5 (#31536)

Bumps [rollup](https://github.com/rollup/rollup) from 2.26.3 to 2.26.5.
- [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/v2.26.3...v2.26.5)

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Update icons.yml

Add new icons set - CoreUI Icons

fix(breakpoints): use next breakpoint when targetting xs only

docs(typography): missing punctuation (#31505)

Bump terser from 5.0.0 to 5.1.0 (#31497)

Bumps [terser](https://github.com/terser/terser) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v5.0.0...v5.1.0)

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Bump sirv-cli from 1.0.5 to 1.0.6 (#31496)

Bumps [sirv-cli](https://github.com/lukeed/sirv) from 1.0.5 to 1.0.6.
- [Release notes](https://github.com/lukeed/sirv/releases)
- [Commits](https://github.com/lukeed/sirv/compare/v1.0.5...v1.0.6)

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Bump rollup from 2.23.1 to 2.26.3 (#31495)

Bumps [rollup](https://github.com/rollup/rollup) from 2.23.1 to 2.26.3.
- [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/v2.23.1...v2.26.3)

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Bump karma-jasmine from 3.3.1 to 4.0.1 (#31494)

Bumps [karma-jasmine](https://github.com/karma-runner/karma-jasmine) from 3.3.1 to 4.0.1.
- [Release notes](https://github.com/karma-runner/karma-jasmine/releases)
- [Changelog](https://github.com/karma-runner/karma-jasmine/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma-jasmine/compare/v3.3.1...v4.0.1)

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Bump @rollup/plugin-babel from 5.1.0 to 5.2.0 (#31493)

Bumps [@rollup/plugin-babel](https://github.com/rollup/plugins) from 5.1.0 to 5.2.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/babel-v5.1.0...babel-v5.2.0)

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Bump @rollup/plugin-node-resolve from 8.4.0 to 9.0.0 (#31492)

Bumps [@rollup/plugin-node-resolve](https://github.com/rollup/plugins) from 8.4.0 to 9.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/node-resolve-v8.4.0...node-resolve-v9.0.0)

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Bump eslint from 7.6.0 to 7.7.0 (#31491)

Bumps [eslint](https://github.com/eslint/eslint) from 7.6.0 to 7.7.0.
- [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/v7.6.0...v7.7.0)

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Bump @rollup/plugin-commonjs from 14.0.0 to 15.0.0 (#31490)

Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins) from 14.0.0 to 15.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/commonjs-v14.0.0...commonjs-v15.0.0)

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Mention that Edge Legacy also supports 'filling' their track

Edge Legacy support filling their track by default.

Example: https://codepen.io/coliff/pen/VwaZgVZ

Remove 'both' as its no longer just 2 breakpoints (now that XXL is there)

Give more priority to `.d-none` (#31473)

Update current_ruby_version to 5.0.0.alpha1 (#31455)

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

Bump @babel/core from 7.11.0 to 7.11.1 (#31465)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.11.0 to 7.11.1.
- [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/v7.11.1/packages/babel-core)

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Bump rollup from 2.23.0 to 2.23.1 (#31464)

Bumps [rollup](https://github.com/rollup/rollup) from 2.23.0 to 2.23.1.
- [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/v2.23.0...v2.23.1)

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Bump eslint-plugin-unicorn from 20.1.0 to 21.0.0 (#31370)

* Bump eslint-plugin-unicorn from 20.1.0 to 21.0.0

Bumps [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn) from 20.1.0 to 21.0.0.
- [Release notes](https://github.com/sindresorhus/eslint-plugin-unicorn/releases)
- [Commits](https://github.com/sindresorhus/eslint-plugin-unicorn/compare/v20.1.0...v21.0.0)

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* Disable `unicorn/prefer-array-find` rule for now

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Remove flex: 1 0 100% from rows (#31439)

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

make breakpoints specifications consistent with layout/grid.md

0-576px could be misinterpreted "up to 576px included"

docs: Fix issue number typo in migration

box-shadow() mixin allow 'null' and drop support 'none' with multiple args (#30394)

* Support 'null' and drop `none` with multiple args

* Output a warning when use 'none' with multiple arguments

* Add migration note

* Update migration.md

Co-authored-by: Mark Otto <markd.otto@gmail.com>
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Ensure to increase contrasts on buttons & colored links hover/active states (#30989)

* feat(buttons): ensure to increase contrasts on hover/active

* Update _buttons.scss

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
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Bump terser from 4.8.0 to 5.0.0 (#31416)

Bumps [terser](https://github.com/terser/terser) from 4.8.0 to 5.0.0.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v4.8.0...v5.0.0)

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Bump @babel/preset-env from 7.10.4 to 7.11.0 (#31422)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.10.4 to 7.11.0.
- [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/v7.11.0/packages/babel-preset-env)

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Bump @babel/core from 7.10.5 to 7.11.0 (#31421)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.10.5 to 7.11.0.
- [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/v7.11.0/packages/babel-core)

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Bump autoprefixer from 9.8.5 to 9.8.6 (#31420)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.8.5 to 9.8.6.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.8.5...9.8.6)

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Bump sirv-cli from 1.0.3 to 1.0.5 (#31419)

Bumps [sirv-cli](https://github.com/lukeed/sirv) from 1.0.3 to 1.0.5.
- [Release notes](https://github.com/lukeed/sirv/releases)
- [Commits](https://github.com/lukeed/sirv/compare/v1.0.3...v1.0.5)

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Bump eslint from 7.5.0 to 7.6.0 (#31418)

Bumps [eslint](https://github.com/eslint/eslint) from 7.5.0 to 7.6.0.
- [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/v7.5.0...v7.6.0)

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Bump karma from 5.1.0 to 5.1.1 (#31417)

Bumps [karma](https://github.com/karma-runner/karma) from 5.1.0 to 5.1.1.
- [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/v5.1.0...v5.1.1)

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Add view on GitHub links for easier content editing from the docs (#31339)

* Add view on GitHub links for easier content editing from the docs

* Update docs.html

* Move to .btn-bd-light

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

Added opacity-75 and opacity-50 classes

Fixed typo in docs v5 (Utilities/API) page

Removed a broken reference

https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_hr_size
this link is broken, I think we perhaps should remove it?

Add transition to Pagination buttons just like other Bootstrap buttons

Update migration guide (#31387)

* Document change to form check and radio size

* Update todos in Migration guide

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

Add padding to badges (#31132)

* Add padding to badges

The current badges are very tightly padded, and because the top and bottom padding are the same, and aligned to the baseline, this makes badges with descenders (e.g. the "g" in "Danger") look uncomfortably close to the bottom. Adding more ample padding masks this a bit.
An alternative would be to have separate top and bottom padding, with the bottom one slightly larger than the top - but conversely, that then makes badges that contain no text with descenders, and particularly badges that contain all uppercase characters, look too bottom-heavy.
Also adding some left/right extra padding, as currently the pill badges look uncomfortably tight on the sides due to the rounding.

Update copy around breakpoint sizing (#31382)

* Update copy around breakpoint sizing

Fixes #31288

* Update breakpoints.md

* Further copy changes

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

Adjust sizing of checks and radios (#31383)

Moves from 1.25em to 1em to better support custom font-size-base values. Most common would probably be .875rem (14px) and current sizing garbles that into 1.09-ish, thus causing the rendering issues in #31269.

Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>

Remove overflow: hidden from toasts (#31381)

Add accessibility note about dismissible alerts and focus (#31358)

Cleanup/fix after the sr-only to visually-hidden renaming (#31359)

* sr-only -> visually-hidden cleanup

It seems the old screen-readers.md file was left behind, and forgot to rename the mixin

* Fix broken mixins for visually-hidden

Bump @babel/cli from 7.10.4 to 7.10.5 (#31372)

Bumps [@babel/cli](https://github.com/babel/babel/tree/HEAD/packages/babel-cli) from 7.10.4 to 7.10.5.
- [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/v7.10.5/packages/babel-cli)

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Bump eslint-config-xo from 0.32.0 to 0.32.1 (#31371)

Bumps [eslint-config-xo](https://github.com/xojs/eslint-config-xo) from 0.32.0 to 0.32.1.
- [Release notes](https://github.com/xojs/eslint-config-xo/releases)
- [Commits](https://github.com/xojs/eslint-config-xo/compare/v0.32.0...v0.32.1)

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Bump rollup from 2.21.0 to 2.23.0 (#31369)

Bumps [rollup](https://github.com/rollup/rollup) from 2.21.0 to 2.23.0.
- [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/v2.21.0...v2.23.0)

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Bump @babel/core from 7.10.4 to 7.10.5 (#31368)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.10.4 to 7.10.5.
- [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/v7.10.5/packages/babel-core)

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Bump hugo-bin from 0.62.1 to 0.62.3 (#31367)

Bumps [hugo-bin](https://github.com/fenneclab/hugo-bin) from 0.62.1 to 0.62.3.
- [Release notes](https://github.com/fenneclab/hugo-bin/releases)
- [Commits](https://github.com/fenneclab/hugo-bin/compare/v0.62.1...v0.62.3)

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Bump eslint from 7.4.0 to 7.5.0 (#31366)

Bumps [eslint](https://github.com/eslint/eslint) from 7.4.0 to 7.5.0.
- [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/v7.4.0...v7.5.0)

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Turn off scroll anchoring for accordions (#31346)

New default behavior for scroll anchoring (rolled out in Chrome 84?) leads to unsightly/odd accordion interactions - see #31341
This rule suppresses this new behavior and reverts back to the old way.

See https://drafts.csswg.org/css-scroll-anchoring/

Add toasts to the components requiring JavaScript (#31344)

Bump @rollup/plugin-commonjs from 13.0.1 to 14.0.0 (#31291)

Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins) from 13.0.1 to 14.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/commonjs-v13.0.1...commonjs-v14.0.0)

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Bump hugo-bin from 0.62.0 to 0.62.1 (#31292)

Bumps [hugo-bin](https://github.com/fenneclab/hugo-bin) from 0.62.0 to 0.62.1.
- [Release notes](https://github.com/fenneclab/hugo-bin/releases)
- [Commits](https://github.com/fenneclab/hugo-bin/compare/v0.62.0...v0.62.1)

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docs(skippy): prevent skip links from overlapping header

Sort the versions from the latest to the oldest.

Improve spacing

Update version.md to include v5

Version.md on v5.getbootstrap.com is only referring to v1 > v4 when it should be referring to v1 > v5.

Migration update (#31278)

* Clarify screen reader changes

* Add some docs and reboot notes to migration guide

* Add mention of docs renaming of screen reader helper page

* Mention null vars from navs PR at #31035

* Update migration.md

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

Update devDependencies (#31283)

* @rollup/plugin-babel          ^5.0.4  →   ^5.1.0
* @rollup/plugin-commonjs      ^13.0.0  →  ^13.0.1
* @rollup/plugin-node-resolve   ^8.1.0  →   ^8.4.0
* autoprefixer                  ^9.8.4  →   ^9.8.5
* hugo-bin                     ^0.61.0  →  ^0.62.0
* rollup                       ^2.20.0  →  ^2.21.0

v5: Tweak some colors (#31276)

* Tweak green and cyan colors, bump min contrast ratio to 4.5

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

Join template literals

Add parentheses around multiple spread conditions

Move function

tooltip.js: remove variable used once.

scrollspy.js: minor refactoring

Unbreak lines.

toasts: make default duration 5s (#31109)

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

Easier disabled state customization for button variants (#30639)

* feat(buttons): easier disabled state customization

* docs(migration): mention new arguments for disabled state in button-variant()

* Update migration.md

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

Docs: forms accessibility cleanup (#31114)

* Expand on disabled fieldsets and faked buttons

include further advice/information on how to disable faked buttons for keyboard/AT users

* Centralise accessible name advice in forms overview

seems odd to only mention (separately) label, aria-label etc in input-group and layout. the advice is just as pertinent in other sections like select. checks only skims over this.

moving this, in expanded form, into the overview section itself. adding a specific cross-reference (just because they are easily left with no accname at all) in the checks page.

* Change warning about accessibility, modify server-side example

- paradoxically, due to our current problems with validation (see #28414) and the fact that browsers seem to have improved in this area for the most part, it's now actually better to use browser-native validation
- added explicit `id` and `aria-describedby` association to at least the server-side form error messages, to show how it should be done properly, and expanded the prose for that explaining this.

* Replace `.sr-only` with `.visually-hidden` in new addition

* Copy edits for clarity in parenthetical

* Copy and formatting tweaks

- Wordsmithing here and there
- Turns some hyphens into em dashes
- Turns a long running comma separated list into an unordered list
- Rearranges some copy just a bit

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

Fix docs sass importing example.

Add null variables for nav-link

Replaces #30498 by adding four new null default variables for .nav-link. Doesn't carry over font-style from the original PR though since that's rarely used, at least by default Bootstrap. Nullifies all values from that PR, too, since we count on some basic inheritance here and don't need color by default.

Clear timeout before showing the toast (#31155)

* clear timeout before showing the toast

* Add unit test

* Remove the check for timeout

* Check for clearTimeout to have been called

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

Update layout.md

Single line example for inline forms

Rename `sr-only` to `visually-hidden` in new/renamed helper doc file

Add alias/redirect

Reword slightly awkward-sounding description

Emphasise/call out the note about `.invisible` and AT