CSS hack原理與常見的hack

hack原理：

原理：利用不同瀏覽器對CSS的支持和解析結果不一樣編寫針對特定瀏覽器樣式。常見的hack有1）屬性 hack。2）選擇器hack。3）IE條件註釋

IE條件註釋：適用於[IE5, IE9]常見格式如下

常見的hack

<!--[if IE  6]> Special instructions    for IE  6   here <![endif]-->

選擇器hack：不同瀏覽器對選擇器的支持不一樣

/*****  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 }

屬性hack：不同瀏覽器解析bug或方法

/* 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    */