第七章
1、 样式表：选择器和生命块
2、 !important： 某条声明的重要程度比其他高，在末尾添加
3、 属性值：inherit; 是强制继承
4、 1em=16px;
5、 可以接受不带单位的属性：line-height、z-index、opacity
6、 background-color/color/border/box-shadow/text-shadow: rgba(89,0,127,.2);最后一个是透明度
7、 属性：hsl(95,10%,28%) 色相、饱和度、亮度
第八章
1、 在和
第九章
1、 下一级子元素：> 相邻同胞元素：+
2、 选择元素的第一个字母或者第一行：firsr-letter、：first-line【在css3中，使用::代替：】
第十章
1、 font-weight：bold/（输入100-900之间100的倍数，400代表正常粗细，700粗体）/normal
2、 background-attachment：背景图片是否随滚动条滚动
3、 text-aligh：justify让文本两端对齐
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