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Closes #14202.

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Refs #13875.

Addresses #14148.

Fixes #14038.

Research supporting this choice of approach:
    https://gist.github.com/cvrebert/68659d0333a578d75372

Why not <button>?
Even with a `tabindex` attribute, they don't gain focus when clicked upon in:
    * Mac OS X Firefox 30.0
    * Mac OS X Safari 7.0.5

/cc @cvrebert @hnrch02

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Fixes #14114

Fixes #14095: Add basic styling for captions, which we've for some reason been missing all this time.

Fixes #13974, #14123: Remove translate3d repaint performance enhancement for text rendering and position wonkiness