Code:

 

<script>

var isSafari3 = false;

//window.devicePixelRatio &&  window.getMatchedCSSRules is only implemented by Safari 3 now.
if( window.devicePixelRatio &&  window.getMatchedCSSRules ){
//you need  put html {list-style-image:none;} in yout Safari 3 only stylesheet first
//we detect whether if it's Safari 3 by checking if it read some Safari 3 only styles
   isSafari3  =  !!window.getMatchedCSSRules(document.documentElement,'');
}
</script>

Code:

 

/*Safari 3 patches*/

@media screen and (-webkit-min-device-pixel-ratio:0){
 
 html{

/*
need this so that Safari3 can
use window.getMatchedCSSRules to collect CSSStyleRule later
*/

list-style-image:none;

 }

.yourclass{

properties

}
}