css units

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Header One Header Two
em 1em = 16px (depend on body font-size )
rem depend on root html font-size
ex .
ch .
vw 1% viewport width
vh 1% viewport height
vmin smaller vw/vh
vmax larger vw/vh
% percentage
cm .
mm .
in 1in = 96px
px  
pt 1/72*1in
pc 12* 1/72 * 1in

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css, ui, ux