CSS browser compatibility

1. tags recognized by various browsers

Special labels	IE6	IE7	IE8	Firefox	Chrome	Safari
! Important	.	Y	.	Y	.	.
_	Y	.	.	.	.	.
*	Y	Y	.	.	.	.
* +	.	Y	.	.	.	.
\ 9	Y	Y	Y	.	.	.
\ 0	.	.	Y	.	.	.
Nth-of-type (1)	.	.	.	.	Y	Y

2. Differences between IE and non-ie browsers

# Div
{
Background : Blue ; /* Non-ie background blue */
Background : Red \ 9 ; /* IE6, IE7, and IE8 background red */

} 

3. Differences among IE6, IE7, IE8, FF, chrome, and Safari

# Div
{
Background : Blue ; /* Firefox background blue */
Background : Red \ 9 ; /* IE8 background red */
* Background : Black ; /* IE7 black background */
_ Background : Orange ; /* IE6 Background orange */
/* Internet Explorer [\ 9], Internet Explorer 6 and Internet Explorer 7 [*], and Internet Explorer 6 can recognize [_]. Therefore, writing it down in order will allow the browser to correctly read the CSS syntax that you can understand. */

}
Body: Nth-of-type (1) P {color: red;}/* chrome, Safari support */