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an m unit determines how large something is relative to its parent containeramp;#39;s font size for instance by default most html tags start off with a font size of 16 pixels using an m unit we can say that one m is equal to a parent divamp;#39;s default of 16 pixels so if we were to set a paragraph tag that is nested within a parent div to have a font size of 1.25 m weamp;#39;d be changing the paragraph tagamp;#39;s font size from 16 to 20 pixels since the 16 pixels of the parent div times 1.25 m is going to be equal to 20. if we were to change the parenthesis font size to be 20 pixels instead of 16 well then the paragraph tag with a font size of 1.25 m would be 20 times 1.25 which would be equal to 25 pixels m units are used if you want your text to always be relative to a parent tag if you have multiple elements inside of a div where some are smaller than others yet you want to maintain the ratio of their font sizes it makes sense to use a set pixel size on the parent then use a
