We've resolved on the 'stretch' behavior: https://github.com/w3c/csswg-drafts/issues/6789#issuecomment-971805915 So, the expectation is that the green outline should grow to fill the black outline, in all of the cases here (except for radio/checkbox).
Bug 1740580 Comment 6 Edit History
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We've resolved on the 'stretch' behavior: https://github.com/w3c/csswg-drafts/issues/6789#issuecomment-971805915 So, the expectation is that the green outline should grow to fill the black border (aside from any `margin` applied via UA stylesheet rules), in all of the cases here (except for radio/checkbox).