* Add dropright (right placement for our dropdown)

* Add dropleft

* moves drop left arrow to the left

* Add .modal-dialog-centered for optional vertically cenetered modal

Fixes #23638

* adds modal-dialog-centered class to docs and removes margin to avoid generating a vertical scrolling

* mention limitations

* fix aria attr

* Add `width: 100%` to the .modal-content for the centered version. Adding it here to avoid adding another selector by limiting it to the centered modal modifier.

* Add information about the fact we do not use Popper.js for Dropdown contained in navbars

* Update dropdowns.md

* Update dropdowns.md

Closes #24437, closes #22457

This document contains the word JavaScript everywhere apart from in one place where it's abbreviated to JS. This just makes sure it's written as JavaScript consistently across the page.

double use of see

* Refer to utility classes uses. Add Printing section

refer to (not navbar) classes used for newbies
navbars don't print, so add example of a print-only alternative

* typos, add links

typo in {% example %}
add links to component pages

* grammar

* Add a dropdown with divider to the main example

* change id name to stop travis error

I assume id="camelCase" is the standard for id names, rather than the clearly superior id="underscore_words"

* review changes

still like to emphasise the foreign utility classes in the main example
bg-light's name is self explanatory (so its obvious where to look it up), but mr-sm-2's name isn't at first

* review changes

* grammar

* .fixed-top/bottom don't reserve space on the screen

... as they are position:fixed. 
better wording welcome

* copyediting

- rewrite utils line and link to the utils pages
- restore the paragraphs to the placement section
- fix formatting and grammar

* fixes migration forms guides

* removes container from Horizontal form

* adds col-form-label sizes on form docs

* removes .form-control-label from forms.scss

* add note to migration

* revert #23108, which had no bug but was a problem with the example code

* add example to the docs for future proofing

* move it up

* Add dispose methods in our documentation

* Update buttons.md

* Updates docs to match Tooltip type checking

Documentation now matches the types defined in the DefaultType constant in
js/src/tooltip.js

* Revert documentation clarify where true is invalid

* Offset option can be function (Popper.js)

* Fix...add function type for offset option

* Remove constants for popper config

* Optimize code. Remove foreach loop.

* Refactoring. Remove getOffset method

https://github.com/twbs/bootlint/wiki/W007

* use a trailing slash when possible
* use https when possible
* remove a few redirected links
* consistently use `https://popper.js.org/`
* fix `iconUrl` in nuget files
* change Jekyll Windows guide to the official one

* Use `aria-selected` instead of `aria-expanded`
* Change tab.js to use `aria-selected` rather than `aria-expanded`
* Add `aria-orientation=vertical` to vertical tab list
* Remove dynamic tabs with dropdowns
* Fix non-interactive code examples
* Only set `aria-selected` on the `role="tab"` trigger - this stops `aria-selected` being incorrectly added to the `role="tabpanel"` itself (probably harmless, but nonetheless incorrect)