A hidden frame still traps keyboard focus
frame-focusable-content
Embedded content is removed from the tab order but still contains things that can be tabbed to.
Who this affects
Keyboard users, whose focus vanishes into an inaccessible frame.
Fix it in WordPress
Usually an embedded video or map that a performance plugin has modified. Check its lazy-loading settings.
What the fix is, technically
Remove tabindex="-1" from the frame, or remove the focusable content inside it.
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