This is not true in CSS. In CSS pt is an absolute unit and does not depend on the size of the current font the way em does. See: https://drafts.csswg.org/css-v

This is not true in CSS. In CSS pt is an absolute unit and does not depend on the size of the current font the way em does. See: https://drafts.csswg.org/css-values-3/#absolute-lengths https://drafts.csswg.org/css-values-3/#absolute-lengths Much terminology have a different meaning in CSS than in traditional typography. For example the em unit does not actually depend on the width of on "m"-letter in the font, rather it depends on the height of the font.