It is designed to test the new Understanding Success Criterion 2.5.8: Target Size (Minimum), which will be introduced in WCAG 2.2 (currently draft). The criterion specifies that “the target offset is at least 24 CSS pixels to every adjacent target”, to “help ensure targets can be easily activated without accidentally activating an adjacent target”.
Adrian adds a disclaimer that, as this is a new SC, it is still in flux and may not even be a square when done. Follow the GitHub discussions for updates.
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