How to express units in css? unit method in css

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px: absolute unit, the page is displayed in precise pixels

em: relative unit, the reference point is the size of the font of the parent node, if the font is defined by itself -size is calculated by itself (the default font of the browser is 16px), and 1em is not a fixed value in the entire page.

rem: relative unit, which can be understood as "root em", calculated relative to the font size of the root node html, CSS3 new attribute, chrome/firefox/IE9 supports

vw: viewpoint width , window width, 1vw is equal to 1% of the window width.

vh: viewpoint height, window height, 1vh is equal to 1% of the window height.

vmin: The smaller of vw and vh.

vmax: The larger of vw and vh.

vw, vh, vmin, vmax: partially supported by IE9, supported by chrome/firefox/safari/opera, supported by ios safari 8, supported by android browser4.4, supported by chrome for android39

%: Percentage

in:inch

cm:cm

mm:mm

pt:point, about 1/72 inch

pc :pica, about 6pt, 1/6 inch

ex: Take the x-height of the font currently acting on the effect, and calculate it as 0.5em if the x-height cannot be determined (not supported by IE11 and below, firefox /chrome/safari/opera/ios safari/android browser4.4, etc. all require attributes plus prefixes)

ch: Based on the "0" character in the font used by the node, if it cannot be found, it is 0.5em(ie10,ch

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