- Using the grid classes, they still need clearfixes since rows aren't injected between them all
- Update docs to fix broken classes

- Make it an explicit class instead of qualifying with elements (.list-group-item-action)
- Rearrange the entire file for more straightforward flow
- Fix text-decoration bug as a result of the reorder
- Switch from h4's to h5's in docs
- Update docs to merge anchors and buttons sections; clearify usage guidelines there, too
- Nullify #17479 in the process

- Both classes do about the same thing, but with different names
- Clarifies docs for .m-x-auto requiring a fixed width block element for it to work
- Add missing heading for clearfix section in docs (unrelated)

- Flexbox responsive behavior fixed with specific .col-{breakpoint} classes now added
- Dropped the make-col mixin in favor of a column-basics placeholder that we can extend across our grid infrastructure
- Updated docs to use required .col-xs-12 (as a safeguard for when folks enable flexbox mode--this isn't necessary in default grid mode)
- Update flexbox grid docs to include responsive docs, tweak some other bits too

flip things around again, no more base class, try out some new stuff to keep responsive flex grid working

Revamp grid classes to require .col base class and improve flexbox grid classes with auto layout via flex: 1

This reverts commit deeb74e3.

Reverts #18038
Fixes #18992
[skip sauce]
[skip validator]

Dump the type margin overrides in alerts for utils, document that particular example, sidesteps part of #18884

- Rename -height to -height-base to match other vars
- Drop use of -height across the board and rely on it to be inherited
- Adjust padding of .dropdown-header to account for different line-height of h6 heading element (this needs refactoring for variables and rems also)

When using a <label> as an .input-group-addon, there will be a default margin-bottom of .5rem via Reboot.
This will lead to undesirable whitespace below the label and the <input> will become taller than needed. By removing the margin, it will play nice with <label> elements.

Closes #19012

[skip sauce]

Revert "fixes #17379: override search input box-sizing to match our global overrides"

This reverts commits 468a9d93 & 57998dc2.

https://github.com/necolas/normalize.css/pull/496 has made this override unnecessary.

[skip sauce]

Bump Normalize to https://github.com/necolas/normalize.css/commit/fe567632afcf8afcf17925ab2a507ed87504cce8

So as to pull in https://github.com/necolas/normalize.css/pull/496

Remove print-specific img max-width:100%; style so that Google Maps and other widgets print correctly

See https://github.com/h5bp/html5-boilerplate/issues/1741
X-Ref: #1506

Closes #18887