Differentiate CSS hack in IE6, IE7, and Firefox 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) cannot recognize *; IE6 can recognize *, but not! Important and IE7 can recognize * and also! Important; FF cannot recognize *, but can recognize it! Important;

 

	IE6	IE7	FF
*	√	√	×
! Important	×	√	√

Add another underscore "_",
IE6 supports underlines, while IE7 and Firefox do not.

 

So you can also distinguish IE6, IE7, and Firefox.
: Background: orange; * Background: green; _ Background: blue;

Note: No matter what method, the order of writing is Firefox's preface, IE7's writing in the middle, and IE6's writing at the end.