css3中的一些特别的单位：em、rem、vw、vh、vmin、vmax_html/css

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css3中的一些特别的单位：em、rem、vw、vh、vmin、vmax_html/css_WEB-ITnose

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Jun 21, 2016 am 08:48 AM

em：相对父元素的单位。例：父节点font-size：20px；子节点font-size：1em；（即子节点为20px）。

rem ：相对于根节点（html的字体大小）的单位。在不设定html字体大小时，会获取流浪器的默认字体大小。例：font-size:1rem;即元素的字体大小为1倍的流浪器默认字体大小。另外需注意chrome强制最小字体为12px，即使设置成 10px 最终都会显示成 12px，当把html的font-size设置成10px,子节点rem的计算还是以12px为基准。

vw：相对于视窗宽度（viewpoint width）。如：height：100vw；且此时的视窗宽为200px，则height：（100*200）/100。

vh：相对于视窗宽高度（viewpoint height）。与vm同理。

vmin：vw和vh中较小的那个。

vmax：vw和vh中较大的那个。

vw, vh, vmin, vmax流浪器支持情况说明：IE9+局部支持，chrome/firefox/safari/opera支

持，iOS safari 8+支持，Androidbrowser4.4+支持，chrome for android39支持

css中的一些其他单位：

in：英寸

cm：厘米

mm：毫米

ex：一个 ex 是一个字体的 x-height。 (x-height 通常是字体尺寸的一半,在无法确定x-height

的情况下以0.5em计算)

pt：磅 (1 pt 等于 1/72 英寸)

pc：12 点活字 (1 pc 等于 12 点)

ch:以节点所使用字体中的“0”字符为基准。找不到时为

0.5em(ie10+,chrome31+,safair7.1+,opera26+,ios safari 7.1+,android browser4.4+支持)

px：像素 (计算机屏幕上的一个点)

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