css - Issues with "font-size: 100%" -

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i'm new css i'm sorry if dumb question.

i making site , used this:

body {   font-size: 80%; }

later, today, tried apply ericmeyer's css reset page above 80% declaration, it's causing sorts of trouble font sizing.

i didn't think issue because thought font-size 100% wouldn't change font, "use font of parent" that's not case.

what font-size 100% declaration do? why applied every element in reset (i.e. html,body,div,span,a,b,i,font,etc {font-size} rather body{font-size} using, seemed inherited fine)?

before "just remove 100%" i'd know it's doing. 100% mean, , why mr. meyer apply bunch of elements rather body doing?

does using font-size: 0.8em; work? since 1em "the size of character", 0.8em should give want.


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