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Increment quick start options in readme.md to five

Add Wall of Browser Bugs entry for #16022

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Disable jQuery event aliases when running test suite

rm `visibility` where redundant to `display`

Affix: $('body') => $(document.body)

Refs #15755

Removed `visibility: hidden !important` from `.hidden` class

To ensure that we don't accidentally use any of the aliases.
This should prevent any future regressions from #12761.
Also updates the test suite since it now can't use these aliases either.

.collapse('hide') on hidden uninit-ed collapsible no longer shows it

Enhancements to Modal visual test

Refs https://github.com/twbs/bootstrap/issues/14837#issuecomment-77441999

They are grunt-html-validation leftovers.

[ci skip]

Document JS test suite basics

X-Ref: #15953
Closes #15952 by merging a tweaked version of it.
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[skip validator]

Appears to be unnecessary and is broken by #16011,
which is otherwise quite sane.

Thanks to @peterblazejewicz & @Nikita240
Adds unit tests based on #14417
X-Ref: #14282
Closes #15807

Update initial release announcement dead link

Found it! They just changed the link.

[Fix #16001] Add link to Vietnamese translation

[Fix #16001] Add link to Vietnamese translation

Hiding an uninitialized tooltip/popover no longer initializes it

Erratum from #15496