* Fixes #11055: add mention of select menu styling on Android stock
browsers with included optional fix
* Update IDs and docs nav to include bookmark links to each section
* Add callout to navbar docs about fixed position, inputs, and virtual
keyboard

* Removes an old pair of selectors that didn’t properly target the
right-aligned navbar alignment of dropdown menus.
* Deprecates the `.pull-right` alignment in favor of a more specific
and unique class name.
* Adds `.dropdown-menu-right` as the new alignment class. This is then
mixin-ed into the `.navbar-right.navbar-nav` dropdown menus for
auto-alignment.
* To override that auto-alignment, use `.dropdown-menu-left` as needed.

* Adds nav link to sidebar for contextual classes
* Refactors to use prefixed classes, like .list-group-item-info, instead of chained classes
* Adds default and linked variations to example in docs

type="button" doesn't make sense for an <a>

Fixes #11268: Account for badges within buttons by matching background to text color and text color to background

Removed all the periods. Tested in Chrome and Firefox
(current versions). In Chrome you get a stray newline when
triple-clicking, in Firefox it is clean.

fixes #11550

* Since we removed the z-index of our default navbars in 76baacf2, we no longer need this warning.
* A quick test of the new code showed no problems with dropdowns falling behind a sibling navbar, so folks should be good to go.

Rebased from #10930

According to comment on https://github.com/twbs/bootstrap/issues/10948#issuecomment-25751889 .

[Finishes #10448]

Glyphicons are 200

refers to #9794

Link was pointing to #js-alerts, but that section of the page does not exist. Changed to #alerts instead.

This reverts commit b3a23fa3.