(1): input is a combo on iPhone: paddings are not allowed -> need to force height
(1b): input is a combo on Mac: paddings are not allowed -> need to force height
(2): input has a lower height on Chrome & Firefox -> need to force height
(3): image input has a lower height on Safari and Firefox when empty
(4): week input is not recognized on iPhone
(5): checkbox and radio inputs are not resized on Mac & Firefox
(6): file input keeps the default focus style on Firefox (2px outline)