IE hack ( Internet explorer HAck)

This is the Hack for internet explorer 
these lines are only executed when we use internet explorer

• IE8 or below: to write CSS rules specificially to IE8 or below, add a backslash and 9 (\9) at the end before the semicolon.
• IE7 or below: add an asterisk (*) before the CSS property.
• IE6: add an underscore (_) before the property.

body {  
 color: red; /* all browsers, of course */  
 color : green\9;    /* IE8 and below */  
 *color : yellow;   /* IE7 and below */  
 _color : orange;   /* IE6 */  
}

#div { height: 300px\9; }

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