css unit summary

Font-size of body:14px Font-size of the second-generation child element of body:

em: 1.2em=1.2*1.2*14px

rem:1.2rem=1.2*14px

Viewport height: 1000px Viewport width: 500px

vh:1vh=1000px/100

vw:1vw=500px/100

##vmin:vmin=500px/100

vmax:vmax=1000px

##ch:Unit usually Defined as the width of the number 0

ex: Defined as the height of the lowercase x letter of the current font or 1/2 of 1em

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