1:  

   2: /***** Selector Hacks ******/

   3:  

   4: /* IE6 and below */

   5: * html #uno  { color: red }

   6:  

   7: /* IE7 */

   8: *:first-child+html #dos { color: red }

   9:  

  10: /* IE7, FF, Saf, Opera  */

  11: html>body #tres { color: red }

  12:  

  13: /* IE8, FF, Saf, Opera (Everything but IE 6,7) */

  14: html>/**/body #cuatro { color: red }

  15:  

  16: /* Opera 9.27 and below, safari 2 */

  17: html:first-child #cinco { color: red }

  18:  

  19: /* Safari 2-3 */

  20: html[xmlns*=""] body:last-child #seis { color: red }

  21:  

  22: /* safari 3+, chrome 1+, opera9+, ff 3.5+ */

  23: body:nth-of-type(1) #siete { color: red }

  24:  

  25: /* safari 3+, chrome 1+, opera9+, ff 3.5+ */

  26: body:first-of-type #ocho {  color: red }

  27:  

  28: /* saf3+, chrome1+ */

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

  30:  #diez  { color: red  }

  31: }

  32:  

  33: /* iPhone / mobile webkit */

  34: @media screen and (max-device-width: 480px) {

  35:  #veintiseis { color: red  }

  36: }

  37:  

  38:  

  39: /* Safari 2 - 3.1 */

  40: html[xmlns*=""]:root #trece  { color: red  }

  41:  

  42: /* Safari 2 - 3.1, Opera 9.25 */

  43: *|html[xmlns*=""] #catorce { color: red  }

  44:  

  45: /* Everything but IE6-8 */

  46: :root *> #quince { color: red  }

  47:  

  48: /* IE7 */

  49: *+html #dieciocho {  color: red }

  50:  

  51: /* IE 10+ */

  52: @media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {

  53:    #veintiun { color: red; }

  54: }

  55:  

  56: /* Firefox only. 1+ */

  57: #veinticuatro,  x:-moz-any-link  { color: red }

  58:  

  59: /* Firefox 3.0+ */

  60: #veinticinco,  x:-moz-any-link, x:default  { color: red  }

  61:  

  62: /* FF 3.5+ */

  63: body:not(:-moz-handler-blocked) #cuarenta { color: red; }

  64:  

  65:  

  66: /***** Attribute Hacks ******/

  67:  

  68: /* IE6 */

  69: #once { _color: blue }

  70:  

  71: /* IE6, IE7 */

  72: #doce { *color: blue; /* or #color: blue */ }

  73:  

  74: /* Everything but IE6 */

  75: #diecisiete { color/**/: blue }

  76:  

  77: /* IE6, IE7, IE8, but also IE9 in some cases   */

  78: #diecinueve { color: blue\9; }

  79:  

  80: /* IE7, IE8 */

  81: #veinte { color/*\**/: blue\9; }

  82:  

  83: /* IE6, IE7 -- acts as an !important */

  84: #veintesiete { color: blue !ie; } /* string after ! can be anything */

  85:  

  86: /* IE8, IE9 */

  87: #anotherone  {color: blue\0/;} /* must go at the END of all rules */

  88:  

  89: /* IE9, IE10 */

  90: @media screen and (min-width:0\0) {

  91:     #veintidos { color: red}

  92: }