Error · frame-focusable-content
Embedded content keyboard users can't reach
Lighthouse / axe call it: Frames with focusable content must not have tabindex=-1
A frame is hidden from the keyboard but contains things to interact with.
Who it leaves out: people who can't use a mouse
How to fix it
Remove tabindex=-1 from the frame. Developer task.
In the code
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Related errors
Automated testing covers roughly half of WCAG criteria; a full conformance claim also requires manual review. Technical information, not legal advice.