These checkboxes are all absolutely-positioned pseudo-elements, inside of a `display:inline; position:relative` containing block. We've got some known issues with having `display:inline` as an abspos containing block, mostly tracked as dependencies of bug 489100 (some of which are incremental/stateful-layout things like this bug seems to be -- e.g. bug 1918504).
Bug 1919733 Comment 2 Edit History
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These checkbox-circle-things are all absolutely-positioned pseudo-elements, inside of a `display:inline; position:relative` containing block. We've got some known issues with having `display:inline` as an abspos containing block, mostly tracked as dependencies of bug 489100 (some of which are incremental/stateful-layout things like this bug seems to be -- e.g. bug 1918504).