CSS要点总结 CSS-Style的三种方式三种方式分

CSS-Style的三种方式三种方式分别为external-style ， embed-style和single-element-style 。
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测量与颜色【CSS要点总结】前两项为absolute-value ，后两项为relative-value 。
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测量的单位
共有16种常用的用语义化的颜色名字。
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CSS-Box的spacing,borders和背景由margin ， border和padding三个部分组成。
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CSS的page-layout三栏显示的页面布局
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