css hacks

 /***** Selector Hacks ******/
 
 /* IE6 and below */
 * html #uno  { color: red }
 
 /* IE7 */
 *:first-child+html #dos { color: red } 
 
 /* IE7, FF, Saf, Opera  */
 html>body #tres { color: red }
 
 /* IE8, FF, Saf, Opera (Everything but IE 6,7) */
 html>/**/body #cuatro { color: red }
 
 /* Opera 9.27 and below, safari 2 */
 html:first-child #cinco { color: red }
 
 /* Safari 2-3 */
 html[xmlns*=""] body:last-child #seis { color: red }
 
 /* safari 3+, chrome 1+, opera9+, ff 3.5+ */
 body:nth-of-type(1) #siete { color: red }
 
 /* safari 3+, chrome 1+, opera9+, ff 3.5+ */
 body:first-of-type #ocho {  color: red }
 
 /* saf3+, chrome1+ */
 @media screen and (-webkit-min-device-pixel-ratio:0) {
  #diez  { color: red  }
 }
 
 /* iPhone / mobile webkit */
 @media screen and (max-device-width: 480px) {
  #veintiseis { color: red  }
 }
 
 /* Safari 2 - 3.1 */
 html[xmlns*=""]:root #trece  { color: red  }
 
 /* Safari 2 - 3.1, Opera 9.25 */
 *|html[xmlns*=""] #catorce { color: red  }
 
 /* Everything but IE6-8 */
 :root *> #quince { color: red  }
 
 /* IE7 */
 *+html #dieciocho {  color: red }
 
 /* Firefox only. 1+ */
 #veinticuatro,  x:-moz-any-link  { color: red }
 
 /* Firefox 3.0+ */
 #veinticinco,  x:-moz-any-link, x:default  { color: red  }
 
 /***** Attribute Hacks ******/
 
 /* IE6 */
 #once { _color: blue }
 
 /* IE6, IE7 */
 #doce { *color: blue; /* or #color: blue */ }
 
 /* Everything but IE6 */
 #diecisiete { color/**/: blue }
 
 /* IE6, IE7, IE8 */
 #diecinueve { color: blue\9; }
 
 /* IE7, IE8 */
 #veinte { color/*\**/: blue\9; }
 
 /* IE6, IE7 -- acts as an !important */
 #veintesiete { color: blue !ie; } /* string after ! can be anything */

原文地址:http://css-tricks.com/snippets/css/browser-specific-hacks/