There is no _getInstance method, but there is a getInstance method

This reverts commit cdf56e0e.

* Bump @popperjs/core from 2.9.1 to 2.9.2

Bumps [@popperjs/core](https://github.com/popperjs/popper-core) from 2.9.1 to 2.9.2.
- [Release notes](https://github.com/popperjs/popper-core/releases)
- [Commits](https://github.com/popperjs/popper-core/compare/v2.9.1...v2.9.2

)

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* Update SRI

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Bumps [postcss](https://github.com/postcss/postcss) from 8.2.8 to 8.2.9.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.2.8...8.2.9

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Fixes #33460

Validation feedback for `<select multiple>` should look like
`<textarea>`.

The previous implementation was placing the validation icon in the
middle of the select field together with the single select arrow, that
is not supposed to be part of this kind of inputs

* Update `aria-expanded` attribute in `hide` method

* Remove empty mouseover listeners added for iOS

* Replace site footer with mega footer to link to various projects and community resources

* Fix broken HTML

* Make .nav-link color consistent when using buttons

* Set $nav-link-hover-color to $link-hover-color as default

The spacing margin side identifiers 's' and 'e' may be intuitive for many but explicitly helping users associate the abbreviations to 'start' and 'end' should help people migrate from version 4 with less friction

Bumps [eslint](https://github.com/eslint/eslint) from 7.22.0 to 7.23.0.
- [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/v7.22.0...v7.23.0

)

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Bumps [rollup](https://github.com/rollup/rollup) from 2.42.3 to 2.44.0.
- [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/v2.42.3...v2.44.0

)

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Bumps [karma](https://github.com/karma-runner/karma) from 6.2.0 to 6.3.2.
- [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/v6.2.0...v6.3.2

)

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Bumps [@rollup/plugin-node-resolve](https://github.com/rollup/plugins) from 11.2.0 to 11.2.1.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/node-resolve-v11.2.0...node-resolve-v11.2.1

)

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Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins) from 17.1.0 to 18.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/commonjs-v17.1.0...commonjs-v18.0.0

)

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Bumps [@rollup/plugin-replace](https://github.com/rollup/plugins) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](https://github.com/rollup/plugins/compare/replace-v2.4.1...replace-v2.4.2

)

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.13.10 to 7.13.14.
- [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/v7.13.14/packages/babel-core

)

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* remove stopPropagation from button click event

* test for delegated click events

* ensure button children can open menu

* test to ensure clicking button opens the menu

* check current element and parents

* allow dropdown form click events to bubble