Andrea Fercia b558fbec6f Accessibility: Fix the Customizer available menu items toggles focus for Safari and VoiceOver.
In rare circumstances, for example buttons with icons and no visible text,
`user-select: none;` may trigger a bug that happens only when using Safari and
VoiceOver and doesn't allow focusable elements to receive focus correctly.
Worth reminding `user-select: none;` is a non-standard property and should be
used with care especially now that `::selection` is almost universally supported.

Fixes #37589.

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git-svn-id: http://core.svn.wordpress.org/trunk@38585 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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