浏览器的兼容性问题，通常是因为不同的浏览器对同一段代码有不同的解析，造成页面显示不统一的情况。
这里谈到的浏览器，主要指IE6/IE7/IE... FireFox Chrome Opera Safari 等。 但更多的兼容还是考虑IE6/IE7/FF之间的斗争
先来谈谈CSS Hack
我们为了让页面形成统一的效果，要针对不同的浏览器或不同版本写出对应可解析的CSS样式，所以我们就把这个针对不同浏览器/版本而写CSS的过程叫做 CSS hack.
CSS hack主要有三种：IE条件注释法、CSS属性前缀法、选择器前缀法。
（1）IE条件注释法，即在正常代码之外添加判别IE浏览器或对应版本的条件注释，符合条件的浏览器或者版本号才回执行里边的代码。
<!-- lt是小于 gt是大于 lte是小于等于 gte是不小于 !是不等于 --><!-- [if IE]> 你想要执行的代码 <![endif]--><!-- [if lt IE 8]> 你想要执行的代码 <![endif]--><!-- [if ! IE 8]> 你想要执行的代码 <![endif]-->
(2)CSS属性前缀法，即是给css的属性添加前缀。比如 * 可以被IE6/IE7识别，但 _ 只能被IE6识别，IE6-IE10都可以识别 "\9"，IE6不能识别!important FireFox不能识别 * _ \9
可以先使用“\9"标记，将IE分离出来，再用”*"分离出IE6/IE7，最后可以用“_”分离出IE6.type{ color: #111; /* all */ color: #222\9; /* IE */ *color: #333; /* IE6/IE7 */ _color: #444; /* IE6 */ }所以可以按着优先级就能给特定的版本捎上特定颜色
一般来说，只有IE6不支持 !important 所以可以这样#example{ width: 100px !important; /* IE7 FF */ width: 110px; /* IE6 */因为!important 具有最高优先级，所以此种方式可以区别出来~ 为什么说一般呢...你看看下面这个例子，IE6貌似还认得出!important
h1{color: #f00 !important; } h1{color: #000;} h2{color: #f00 !important; color: #000;}<h1 id="test">test1</h1><h2 id="test">test2</h2>
（3）选择器前缀法，顾名思义，就是给选择器加上前缀。
IE6可识别 *div{color:red;} IE7可识别 *+div{color:red;} 再来看看主要的兼容问题：
（1）最主要也是最常见的，就是浏览器对标签的默认支持不同，所以我们要统一，就要进行CSS reset . 最简单的初始化方法是 *{margin:0; padding:0;} 但不推荐，而且它也并不完善。
贴一个淘宝的样式初始化~
body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, form, fieldset, legend, button, input, textarea, th, td { margin:0; padding:0; } body, button, input, select, textarea { font:12px/1.5tahoma, arial, \5b8b\4f53; } h1, h2, h3, h4, h5, h6{ font-size:100%; } address, cite, dfn, em, var { font-style:normal; } code, kbd, pre, samp { font-family:couriernew, courier, monospace; } small{ font-size:12px; } ul, ol { list-style:none; } a { text-decoration:none; } a:hover { text-decoration:underline; } sup { vertical-align:text-top; } sub{ vertical-align:text-bottom; } legend { color:#000; } fieldset, img { border:0; } button, input, select, textarea { font-size:100%; } table { border-collapse:collapse; border-spacing:0; } (2)IE6双边距bug: 块属性标签添加了浮动float之后，若在浮动方向上也有margin值，则margin值会加倍。其实这种问题主要就是会把某些元素挤到了第二行
<style type="text/css"> html,body,div{ margin: 0;padding: 0;} .wrap{width: 200px; height: 200px; border: 1px solid #333;} .box{float: left; /* display:inline */ ;margin-left: 10px; width: 80px; height: 80px; background-color: green;} </style></head><body><div class="wrap"> <div class="box"></div> <div class="box"></div></div><script type="text/javascript"></script></body>
IE6下左边的双边距 ~
IE7的没问题 ~
解决的方式有两个：
1.给float元素添加display：inline 即可正常显示
2.就是hack处理了，对IE6进行 _margin-left:5px;
(3)跟上述差不多，也属于IE6双边距bug: 行内属性标签，为了设置宽高，我们经常就会设置成display：block; 这样一来就产生上述的问题。
解决办法也是天津display：inline; 但是这样一来我们就不能设置宽高了，所以呢需要再加个 display:table.
所以你设置display:block后，再添上display:inline和display:table
(4)上下margin重合问题，相邻的两个div margin-left margin-right 不会重合，但相邻的margin-top margin-bottom会重合。
.box1{width: 200px;height: 200px; border: 1px solid #333; } .mt{margin-top: 10px;} .mb{margin-bottom: 10px;}<div class="box1 mb"></div><div class="box1 mt"></div> 看吧，本来该20px的现在它只有10px
解决办法就是不要同时采用top和bottom ,统一一些~
（5）有些浏览器解析img标签也有不同，img是行内的，一般都会紧接着排放，但是在有些情况下还是会突然出现个间距，解决办法是给它来个浮动 float
(6)标签属性min-height是不兼容的，所以使用的时候也要稍微改改。这样吧：
.box{min-height:100px;height:auto !important; height:100px; overflow:visible;} 另一方面，IE是不支持min-height这类属性的，所以有些时候也可以考虑使用CSS表达式
#container{ min-width:600px; width: expression(document.body.clientWidth < 600? "600px":"auto");
(7)很多时候可能会纳闷超链接访问过后 样式就混乱了，hover样式不出现了。其实主要是其CSS属性的排序问题。一般来说，最好按照这个顺序：L-V-H-A
简单的记法是 love hate a:link{} a:visited{} a:hover{} a:active{} (8)chrome下默认会将小于12px的文本强制按照12px来解析。解决办法是给其添加属性：
-webkit-text-size-adjust: none;
（9)png24位的图片在IE6下面会出现背景，所以最好还是使用png8格式的
(10)因为存在两种盒子模式：IE盒子模式和W3C标准模式，所以对象的实际宽度也要注意。
IE/Opera：对象的实际宽度 = (margin-left) + width + (margin-right)
Firefox/Mozilla：对象的实际宽度= (margin-left) + (border-left-width) + (padding- left) + width + (padding-right) + (border-right-width) + (margin-right)
（11）鼠标的手势也有问题：FireFox的cursor属性不支持hand，但是支持pointer，IE两个都支持；所以为了兼容都用pointer
（12）有个说法是：FireFox无法解析简写的padding属性设置。
如padding 5px 4px 3px 1px；必须改为 padding-top:5px; padding-right:4px; padding-bottom:3px; padding-left:1px。但我试了一下，发现还是可以解析的，难道是版本的原因？
（13）消除ul、ol等列表的缩进时，样式应写成:list-style:none;margin:0px;padding:0px; 其中margin属性对IE有效，padding属性对FireFox有效
（14）CSS控制透明度问题：一般就直接 opacity: 0.6 ; IE就 filter: alpha(opacity=60)
但在IE6下又有问题，所以又得弄成 filter:progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=60);
(15)有些时候图片下方会出现一条间隙，通常会出现在FF和IE6下面比如
<div><img src="/static/imghwm/default1.png" data-src="1.jpg" class="lazy"/ alt="Summary of common CSS compatibility issues_html/css_WEB-ITnose" ></div>一般给img添加vertical-align属性即可，比如top middleimg{verticle-align:center;} (16)IE6下div高度无法小于10px
比如定义一条高2px的线条，FF和IE7都正常
但IE6就是10px
解决的办法有两种：添加overflow属性或设置fontsize大小为高度大小 如：
<div style="max-width:90%"></div><div style="height:2px;font-size:2px;background:#000000;width:778px;">&nbps;</div>
-----------------兼容性问题有很多，一次也说不完，往后遇到了，再慢慢添加进来-------------------------
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