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我们接着上一章,继续学习一些有关对齐、布局、导航栏的内容。
1.水平块对齐:
1.1 margin:把左和右外边距设置为 auto,规定的是均等地分配可用的外边距。结果就是居中的元素
.center {margin-left:auto;margin-right:auto;width:70%;background-color:red;}
1.2 position:使用 position 属性进行左和右对齐
.right {position:absolute;right:0px;width:300px;background-color:gray;}
1.3 float:使用 float 属性来进行左和右对齐
.right {float:right;width:300px;background-color:gray;}
浏览器兼容性问题:
当像这样对齐元素时,对
元素的外边距和内边距进行预定义是一个好主意,这样可以避免在不同的浏览器中出现可见的差异。
当使用 position / float 属性时,IE8 以及更早的版本存在一个问题。如果容器元素设置了指定的宽度,并且省略了 !DOCTYPE 声明,那么
IE8 以及更早的版本会在右侧增加 17px 的外边距。这似乎是为滚动条预留的空间。当使用 position / float 属性时,请始终设置
!DOCTYPE 声明。
2.尺寸
height width line-height(设置行高)
max-height max-width
min-height min-width
3.分类属性
clear: 清除元素侧面的浮动元素
display: inline