数据分析师2017-09-30 23:18:37
What is the difference between em and px for line-height? -PHP Chinese website Q&A-What is the difference between em and px for line-height? -PHP Chinese website Q&A
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阿神2016-12-21 09:59:58
px像素（Pixel）。相对长度单位。像素px是相对于显示器屏幕分辨率而言的。(引自CSS2.0手册)
em是相对长度单位。相对于当前对象内文本的字体尺寸。如当前对行内文本的字体尺寸未被人为设置，则相对于浏览器的默认字体尺寸。(引自CSS2.0手册)
