I don't think the approach you posted works quite right. i.e. it doesn't take into account the border thickness. Adding the outline-width onto its radius looks right to me. Is that what we want? Are there other scenarios to take into account?
Bug 315209 Comment 15 Edit History
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I don't think the approach you posted works quite right. i.e. it doesn't take into account the border thickness. Adding the outline-width onto its radius looks right to me. Is that what we want? Are there other scenarios to take into account? EDIT: Also need to take into account outline-offset?