CSS Hack:ie6,ie7,firefox Show different effects

IE8 compatibility issues, this best deal, converted into IE7 compatible can be. Add the following piece of code to the head, and then as long as it is compatible under IE7, IE8 below is also compatible:

<meta http-equiv= "x-ua-compatible" content= "ie=7"/>

The CSS hack to distinguish different browsers:

Difference between IE6 and FF:
Background:orange;*background:blue;

Difference between IE6 and IE7:
Background:green!important;background:blue;

Difference between IE7 and FF:
Background:orange; *background:green;

Difference ff,ie7,ie6:
Background:orange;*background:green!important;*background:blue;

Note: IE can recognize *; standard browsers (such as FF) do not recognize *;

IE6 can recognize *, but not!important,
IE7 can recognize *, can also identify!important;
FF does not recognize *, but can identify!important;

	IE6	IE7	Ff
*	√	√	X
!important	X	√	√

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In addition, add one, underline "_",
IE6 support underscores, IE7 and Firefox do not support underscores.

So we can also distinguish Ie6,ie7,firefox
: Background:orange;*background:green;_background:blue;

Note: No matter what method, the order of writing is the Firefox written in front, IE7 written in the middle, IE6 written in the last side.