Hidden elements can still be reached by keyboard
aria-hidden-focus
Some parts of the page are hidden from screen readers but can still be tabbed into, so keyboard users land somewhere invisible.
Who this affects
Sighted keyboard users, whose focus disappears off screen with no way to tell where they are.
Fix it in WordPress
Usually a closed mobile menu or a hidden slide in a carousel. Most sliders have a setting for this; otherwise the elements need tabindex="-1" while hidden.
What the fix is, technically
Anything marked aria-hidden must not contain focusable elements. Remove them from the tab order too.
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