I agree that it seems like a bug that the checkboxes get inconsistent sizes.  But I think the layout is fine here (there's no inconsistencies in the getBoundingClientRect results).

Presumably this is happening because the checkbox has height:9.6px and the pixel snapping will produce different results depending on the vertical position.  So depending on the exact position, the visual size may end up rounding up (10px) or rounding down (9px).

Perhaps the checkbox painting code in NativeThemeBase::PaintCheckbox should be doing it's own pixel snapping of some sort in order to ensure consistent size regardless of position?  Is this code owned by paint or DOM team?

I don't see this issue in Firefox or Edge, but that's because they don't allow the visual appearance of checkboxes to change size (although they do still allow the layout size to change - so this is only a visual difference with Chrome, probably not observable from JS).

Paint owns anything with a name like PaintCheckbox, I would think, so it's on us. I agree we should be keeping the size constant while snapping position, so this may just be a bug in using the wrong snapping routine.

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