px代表像素。正如罐头上所说：屏幕上的每个点都是一个像素。
ex是指给定字体的x高度，即该字体的小写字母x的高度。
em是指字体所需的最大高度。它是一个常用的相对字体大小，因为它是根据元素（或其父元素（如果继承））的计算字体大小计算的。
pt代表印刷点，即1/72英寸。
%是相对于从元素的父级继承的给定属性的百分比。
请注意，em和%的工作方式相同。Ems类似于百分比的十进制表示，即1=100%，0.01=1%。
您可以在CSS3规范。
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