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样式单位之px、em、rem_html/css_WEB-ITnose

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Release: 2016-06-24 11:36:37
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  最近在看bootstrap.css的时候看到很多单位都用到rem而不是熟系的px。经学习得知:

1、px精确的单位;

2、em为相对单位(相对父级元素)

3、rem为相对单位(相对根元素 html)

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