CSS 水平对齐(Horizontal Align)

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1、中心对齐,使用margin属性

块元素可以把左，右页边距设置为"自动"对齐。Note: 在IE8中使用margin:auto属性无法正常工作，除非声明 !DOCTYPEmargin属性可任意拆分为左，右页边距设置自动指定，结果都是出现居中元素。提示: 如果宽度是100％，对齐是没有效果的。

<!DOCTYPE html><html><head><style>.center{margin:auto;width:70%;background-color:#b0e0e6;}</style></head> <body><div class="center"><p>In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since.</p><p>'Whenever you feel like criticizing anyone,' he told me, 'just remember that all the people in this world haven't had the advantages that you've had.'</p></div><p><b>Note: </b>Using margin:auto will not work in IE8, unless a !DOCTYPE is declared.</p></body></html>

2、使用position属性设置左，右对齐

元素对齐的方法之一是使用绝对定位。注意：绝对定位与文档流无关，所以它们可以覆盖页面上的其它元素。

<!DOCTYPE html><html><head><style>.right{position:absolute;right:0px;width:300px;background-color:#b0e0e6;}</style></head><body><div class="right"><p>In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since.</p><p>'Whenever you feel like criticizing anyone,' he told me, 'just remember that all the people in this world haven't had the advantages that you've had.'</p></div></body></html>

3、Crossbrowser 兼容性问题

元素的填充，始终是一个好主意。这是为了避免在不同的浏览器中的可视化差异。IE8和早期有一个问题，当使用position属性时。如果一个容器元素（在本例中<div class="container">）指定的宽度，!DOCTYPE声明是缺失，IE8和早期版本会在右边增添17px的margin。这似乎是一个滚动的预留空间。使用position属性时始终设置在DOCTYPE声明中！

<!DOCTYPE html><html><head><style>body{margin:0;padding:0;}.container{position:relative;width:100%;}.right{position:absolute;right:0px;width:300px;background-color:#b0e0e6;}</style></head><body><div class="container"><div class="right"><p><b>Note: </b>When aligning using the position property, always include the !DOCTYPE declaration! If missing, it can produce strange results in IE browsers.</p></div></div></body></html>

4、使用float属性设置左，右对齐

使用float属性是对齐元素的方法之一：

<!DOCTYPE html><html><head><style>.right{float:right;width:300px;background-color:#b0e0e6;}</style></head><body><div class="right"><p>In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since.</p><p>'Whenever you feel like criticizing anyone,' he told me, 'just remember that all the people in this world haven't had the advantages that you've had.'</p></div></body></html>

5、Crossbrowser兼容性问题

类似这样的元素对齐时，预先确定margin和元素的填充，始终是一个好主意。这是为了避免在不同的浏览器中的可视化差异。IE8和早期有一个问题，当使用float属性时。如果一个容器元素（在本例中<div class="container">）指定的宽度，!DOCTYPE声明是缺失，IE8和早期版本会在右边增添17px的margin。这似乎是一个滚动的预留空间。使用float属性时始终设置在DOCTYPE声明中！

<!DOCTYPE html><html><head><style>body{margin:0;padding:0;}.right{float:right;width:300px;background-color:#b0e0e6;}</style></head><body><div class="right"><p><b>Note: </b>When aligning using the float property, always include the !DOCTYPE declaration! If missing, it can produce strange results in IE browsers.</p></div></body></html>

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