The Customizer and Theme Installer open in full overlays that need to receive focus. Also, keyboard navigation should be constrained within the overlays. Using CSS `visibility` to hide all the content except the overlays, makes them the only available and focusable content and allows browsers to handle focus natively. See #29158. Fixes #33228, #27705. git-svn-id: https://develop.svn.wordpress.org/trunk@38520 602fd350-edb4-49c9-b593-d223f7449a82
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