css hacks

 1 /***** Selector Hacks ******/
 2 
 3 /* IE6 and below */
 4 * html #uno  { color: red }
 5  
 6 /* IE7 */
 7 *:first-child+html #dos { color: red } 
 8  
 9 /* IE7, FF, Saf, Opera  */
10 html>body #tres { color: red }
11  
12 /* IE8, FF, Saf, Opera (Everything but IE 6,7) */
13 html>/**/body #cuatro { color: red }
14  
15 /* Opera 9.27 and below, safari 2 */
16 html:first-child #cinco { color: red }
17  
18 /* Safari 2-3 */
19 html[xmlns*=""] body:last-child #seis { color: red }
20  
21 /* safari 3+, chrome 1+, opera9+, ff 3.5+ */
22 body:nth-of-type(1) #siete { color: red }
23  
24 /* safari 3+, chrome 1+, opera9+, ff 3.5+ */
25 body:first-of-type #ocho {  color: red }
26  
27 /* saf3+, chrome1+ */
28 @media screen and (-webkit-min-device-pixel-ratio:0) {
29  #diez  { color: red  }
30 }
31  
32 /* iPhone / mobile webkit */
33 @media screen and (max-device-width: 480px) {
34  #veintiseis { color: red  }
35 }
36  
37 /* Safari 2 - 3.1 */
38 html[xmlns*=""]:root #trece  { color: red  }
39  
40 /* Safari 2 - 3.1, Opera 9.25 */
41 *|html[xmlns*=""] #catorce { color: red  }
42  
43 /* Everything but IE6-8 */
44 :root *> #quince { color: red  }
45  
46 /* IE7 */
47 *+html #dieciocho {  color: red }
48  
49 /* Firefox only. 1+ */
50 #veinticuatro,  x:-moz-any-link  { color: red }
51  
52 /* Firefox 3.0+ */
53 #veinticinco,  x:-moz-any-link, x:default  { color: red  }
54  
55  
56  
57 /***** Attribute Hacks ******/
58  
59 /* IE6 */
60 #once { _color: blue }
61  
62 /* IE6, IE7 */
63 #doce { *color: blue; /* or #color: blue */ }
64  
65 /* Everything but IE6 */
66 #diecisiete { color/**/: blue }
67  
68 /* IE6, IE7, IE8 */
69 #diecinueve { color: blue\9; }
70  
71 /* IE7, IE8 */
72 #veinte { color/*\**/: blue\9; }
73  
74 /* IE6, IE7 -- acts as an !important */
75 #veintesiete { color: blue !ie; } /* string after ! can be anything */