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css hack原理及常用hack

原理：利用不同浏览器对CSS的支持和解析结果不一样编写针对特定浏览器样式。常见的hack有1）属性hack。2）选择器hack。3）IE条件注释

• IE条件注释：适用于[IE5, IE9]常见格式如下

• 选择器hack：不同浏览器对选择器的支持不一样

/***** 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  }

• 属性hack：不同浏览器解析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 */