What is CSS hack_html/css_WEB-ITnose-HTML Tutorial-php.cn

由于不同的浏览器，比如Internet Explorer 6,Internet Explorer 7,Mozilla Firefox等，对CSS的解析认识不一样，因此会导致生成的页面效果不一样，得不到我们所需要的页面效果。

这个时候我们就需要针对不同的浏览器去写不同的CSS，让它能够同时兼容不同的浏览器，能在不同的浏览器中也能得到我们想要的页面效果。

这个针对不同的浏览器写不同的CSS code的过程，就叫CSS hack,也叫写CSS hack。

CSS Hack的原理是什么
由于不同的浏览器对CSS的支持及解析结果不一样，还由于CSS中的优先级的关系。我们就可以根据这个来针对不同的浏览器来写不同的CSS。

比如 IE6能识别下划线_和星号*，IE7能识别星号*，当不能识别下划线_，而firefox两个都不能认识。等等

书写顺序，一般是将识别能力强的浏览器的CSS写在后面。下面如何写里面说得更详细些。

如何写CSS Hack
比如要分辨IE6和firefox两种浏览器，可以这样写：

我在IE6中看到是红色的，在firefox中看到是绿色的。

Explanation:
The above css is in Firefox. It cannot recognize the stuff with an asterisk * at the back, so it filters it out and ignores it. The result of the analysis is :div{background:green}, so of course the background of this div is green.
In IE6, both backgrounds can be recognized, and the result of its analysis is: div{background:green;background:red;}, so according to the priority level, the red at the back has a higher priority. , so of course the background color of this div is red.

CSS hack: Distinguish between IE6, IE7, firefox
Distinguish between different browsers, CSS hack writing method:

Distinguish between IE6 and FF:
background:orange;*background :blue;

The difference between IE6 and IE7:
background:green !important;background:blue;

The difference between IE7 and FF:
background:orange; *background:green;

Difference between FF, IE7 and IE6:
background:orange;*background:green !important;*background:blue;

Note: IE can recognize *; standard browser ( For example, FF) cannot recognize *;
IE6 can recognize *, but not !important,
IE7 can recognize *, and it can also recognize !important;
FF cannot recognize *, but can recognize !important;

IE6 IE7 FF
* √ ×
!important √

Add one more, underscore "_",
IE6 supports underscore, IE7 Neither Firefox nor Firefox supports underscores.

So you can also distinguish IE6, IE7, firefox in this way
background:orange;*background:green;_background:blue;

Note: No matter what method is used, the order of writing Firefox is written at the front, IE7 is written in the middle, and IE6 is written at the end.

Attachment: CSS browser compatibility table in one column

b{_flaot:left;} IE6
b{ flaot:left} IE6-7

b{float:left !important;} IE6-8b FF
b{float:right;}

b{float:left !important;float:right;} IE7-8b FF

/**//*/
b{float:left;} IE8b
/**/

html*b{float:left;} IE6-7

body>b{float:left;} IE7-8b FF

html[xmlns] b{float:left;} IE7-8b FF

b{/*/*/float:left;/* */} IE6-7 FF

opaque

< ;div id="alpha">translucent

This article is excerpted from "IT Learner" http:www.itlearner.com/article/2009/4414.shtml

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什么是CSS hack

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