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目前，流行的浏览器(如Firefox、Opera、Internet Explorer、Chrome、Safari等等)中，有一些都是以自己的方式去理解CSS规范，这就会导致有的浏览器对CSS的解释与设计师的CSS定义初衷相冲突，使得网页的样子在某些浏览器下能正确按照设计师的想法显示，但有些浏览器却并没有按照设计师想要的样子显示出来，这就导致浏览器的兼容性问题。更糟的是，有的浏览器完全无视CSS的一些声明和属性。

正因为上述冲突和问题依然存在于这个”不完美的世界”，所以一些设计师想到了一种避免浏览器兼容性问题的方法，那就是CSS Reset，什么是CSS Reset？我们可以把它叫做CSS重设，也有人叫做CSS复位、默认CSS、CSS重置等。CSS重设就是由于各种浏览器解释CSS样式的初始值有所不同，导致设计师在没有定义某个CSS属性时，不同的浏览器会按照自己的默认值来为没有定义的样式赋值，所以我们要先定义好一些CSS样式，来让所有浏览器都按照同样的规则解释CSS，这样就能避免发生这种问题。

提示，Normalize.css 只是一个很小的CSS文件，但它在默认的HTML元素样式上提供了跨浏览器的高度一致性。相比于传统的CSS reset，Normalize.css是一种现代的、为HTML5准备的优质替代方案。Normalize.css现在已经被用于Twitter Bootstrap、HTML5 Boilerplate、GOV.UK、Rdio、CSS Tricks 以及许许多多其他框架、工具和网站上。

【示例】

CSS


/*一.最简化的CSS Reset(重设) :*/

* {
      padding: 0;
      margin: 0;
}

/*　　这是最普遍最简单的CSS重设，将所有元素的padding和margin值都设为0，可以避免一些浏览器在理解这两个属性默认值上的”分歧”。
*/

* {
       padding: 0;
       margin: 0;
       border: 0;
}

/*　　这是在上一个重设的基础上添加了对border属性的重设，初始值为0的确能避免一些问题。
*/

* {
       outline: 0;
       padding: 0;
       margin: 0;
       border: 0;
}

　/*　在前两个的基础上添加了outline属性的重设，防止一些冲突。
 
二.浓缩实用型CSS Reset(重设)*/:


* {
       vertical-align: baseline;
       font-weight: inherit; 
       font-family: inherit; 
       font-style: inherit;
       font-size: 100%;
       outline: 0;
       padding: 0;
       margin: 0;
       border: 0;
}

/*　　该CSS重设方法出自Perishable Press，这是他常用的方法。

三.Poor Man 的CSS Reset:*/


html, body { 
       padding: 0; 
       margin: 0; 
}
html {
       font-size:1em;
} 
body {
       font-size:100%;
} 
a img, :link img, :visited img {
       border:0px;
} 

/*　　这个重设方法将html和body下元素的padding和margin都设为0，并分别为html标签和body标签下的所有元素设置了初始的字体大小，最重要的是把有链接的图片的默认边框去掉了。

四.Siolon’s Global Reset*/


* { 
    vertical-align: baseline;
    font-family: inherit;
    fo

nt-style: inherit;
    font-size: 100%;
    border: none;
    padding: 0;
    margin: 0; 
}
body {
    padding: 5px;
} 
h1, h2, h3, h4, h5, h6, p, pre, blockquote, form, ul, ol, dl {
    margin: 20px 0;
}
li, dd, blockquote { 
    margin-left: 40px;
} 
table { 
    border-collapse: collapse; 
    border-spacing: 0; 
}

/*五.Shaun Inman’s Global Reset*/


body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, p, blockquote, table, th, td, embed, object {
    padding: 0;
    margin: 0; 
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
    fieldset, img, abbr {
    border: 0;
}
address, caption, cite, code, dfn, em, 
h1, h2, h3, h4, h5, h6, strong, th, var {
    font-weight: normal;
    font-style: normal;
}
ul {
    list-style: none;
}
caption, th {
    text-align: left;
}
h1, h2, h3, h4, h5, h6 {
    font-size: 1.0em;
}
q:before, q:after {
    content: ”;
}
a, ins {
    text-decoration: none;
}

/*六.Yahoo(YUI) CSS Reset:*/


body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre, 
form,fieldset,input,textarea,p,blockquote,th,td { 
    padding: 0; 
    margin: 0; 
} 
table { 
    border-collapse: collapse; 
    border-spacing: 0; 
} 
fieldset,img { 
    border: 0; 
} 
address,caption,cite,code,dfn,em,strong,th,var { 
    font-weight: normal; 
    font-style: normal; 
} 
ol,ul { 
    list-style: none; 
} 
caption,th { 
    text-align: left; 
} 
h1,h2,h3,h4,h5,h6 { 
    font-weight: normal; 
    font-size: 100%; 
} 
q:before,q:after { 
    content:”; 
} 
abbr,acronym { 
    border: 0; 
}

/*七.Eric Meyer’s CSS Reset*/


html, body, div, span, applet, object, iframe, table, caption, 
tbody, tfoot, thead, tr, th, td, del, dfn, em, font, img, ins, 
kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, 
h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, 
acronym, address, big, cite, code, dl, dt, dd, ol, ul, li, 
fieldset, form, label, legend { 
    vertical-align: baseline; 
    font-family: inherit; 
    font-weight: inherit; 
    font-style: inherit; 
    font-size: 100%; 
    outline: 0; 
    padding: 0; 
    margin: 0; 
    border: 0; 
} 
:focus { 
    outline: 0; 
} 
body { 
    background: white; 
    line-height: 1; 
    color: black; 
} 
ol, ul { 
    list-style: none; 
} 
table { 
    border-collapse: separate; 
    border-spacing: 0; 
} 
caption, th, td { 
    font-weight: normal; 
    text-align: left; 
} 
blockquote:before, blockquote:after, q:before, q:after { 
    content: “”; 
} 
blockquote, q { 
    quotes: “” “”; 
}

/*八.Condensed Meyer Reset:*/


body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, 
pre, form, fieldset, input, textarea, p, blockquote, th, td { 
    padding: 0;
    margin: 0;
}
    fieldset, img { 
    border: 0;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
ol, ul {
    list-style: none;
}
address, caption, cite, code, dfn, em, strong, th, var {
    font-weight: normal;
    font-style: normal;
}
caption, th {
    text-align: left;
}
h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
    font-size: 100%;
}
q:before, q:after {
    content: ”;
}
abbr, acronym { 
    border: 0;
}

/*九.Ateneu Popular CSS Reset*/


html, body, div, span, applet, object, iframe, h1, h2, h3, 
h4, h5, h6, p, blockquote, pre, a, abbr, acronym, 
address, big, cite, code, del, dfn, em, font, img, ins, 
kbd, q, s, samp, small, strike, strong, sub, sup, tt, 
var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, 
table, caption, tbody, tfoot, thead, tr, th, td { 
    margin: 0; 
    padding: 0; 
    border: 0; 
    outline: 0; 
    font-weight: inherit; 
    font-style: inherit; 
    font-size: 100%; 
    font-family: inherit; 
    vertical-align: baseline; 
} 
:focus {
    outline: 0;
} 
a, a:link, a:visited, a:hover, a:active{
    text-decoration:none
} 
table {
    border-collapse: separate;
    border-spacing: 0;
} 
th, td {
    text-align: left;
    font-weight: normal;
} 
img, iframe {
    border: none;
    text-decoration:none;
} 
ol, ul {
    list-style: none;
} 
input, textarea, select, button {
    font-size: 100%;
    font-family: inherit;
} 
select {
    margin: inherit;
} 
hr {
    margin: 0;
    padding: 0;
    border: 0;
    color: #000;
    
    height: 1px
}

/*十.Chris Poteet’s Reset CSS*/


* { 
    vertical-align: baseline; 
    font-family: inherit; 
    font-style: inherit; 
    font-size: 100%; 
    border: none; 
    padding: 0; 
    margin: 0; 
} 
body { 
    padding: 5px; 
} 
h1, h2, h3, h4, h5, h6, p, pre, blockquote, form, ul, ol, dl { 
    margin: 20px 0; 
} 
li, dd, blockquote { 
    margin-left: 40px; 
} 
table { 
    border-collapse: collapse; 
    border-spacing: 0; 
}

/*十一.Tantek Celik Reset CSS*/


:link,:visited { text-decoration:none } 
ul,ol { list-style:none } 
h1,h2,h3,h4,h5,h6,pre,code { font-size:1em; } 
ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,body,html,p,blockquote,fieldset,input 
{ margin:0; padding:0 } 
a img,:link img,:visited img { border:none } 
address { font-style:normal }

/*十二.Christian Montoya Reset CSS*/


html, body, form, fieldset { 
    margin: 0; 
    padding: 0; 
    font: 100%/120% Verdana, Arial, Helvetica, sans-serif; 
} 
h1, h2, h3, h4, h5, h6, p, pre, 
blockquote, ul, ol, dl, address { 
    margin: 1em 0; 
    padding: 0; 
} 
li, dd, blockquote { 
    margin-left: 1em; 
} 
form label { 
    cursor: pointer; 
} 
fieldset { 
    border: none; 
} 
input, select, textarea { 
    font-size: 100%; 
    font-family: inherit; 
}

/*十三.Rudeworks Reset CSS*/


* { 
    margin: 0; 
    padding: 0; 
    border: none; 
} 
html { 
    font: 62.5% “Lucida Grande”, Lucida, Verdana, sans-serif; 
    text-shadow: #000 0px 0px 0px; 
} 
ul { 
    list-style: none; 
    list-style-type: none; 
} 
h1, h2, h3, h4, h5, h6, p, pre, 
blockquote, ul, ol, dl, address { 
    font-weight: normal; 
    margin: 0 0 1em 0; 
} 
cite, em, dfn { 
    font-style: italic; 
} 
sup { 
    position: relative; 
    bottom: 0.3em; 
    vertical-align: baseline; 
} 
sub { 
    position: relative; 
    bottom: -0.2em; 
    vertical-align: baseline; 
} 
li, dd, blockquote { 
    margin-left: 1em; 
} 
code, kbd, samp, pre, tt, var, input[type=’text’], textarea { 
    font-size: 100%; 
    font-family: monaco, “Lucida Console”, courier, mono-space; 
} 
del { 
    text-decoration: line-through; 
} 
ins, dfn { 
    border-bottom: 1px solid #ccc; 
} 
small, sup, sub { 
    font-size: 85%; 
} 
abbr, acronym { 
    text-transform: uppercase; 
    font-size: 85%; 
    letter-spacing: .1em; 
    border-bottom-style: dotted; 
    border-bottom-width: 1px; 
} 
a abbr, a acronym { 
    border: none; 
} 
sup { 
    vertical-align: super; 
} 
sub { 
    vertical-align: sub; 
} 
h1 { 
    font-size: 2em; 
} 
h2 { 
    font-size: 1.8em; 
} 
h3 { 
    font-size: 1.6em; 
} 
h4 { 
    font-size: 1.4em; 
} 
h5 { 
    font-size: 1.2em; 
} 
h6 { 
    font-size: 1em; 
} 
a, a:link, a:visited, a:hover, a:active { 
    outline: 0; 
    text-decoration: none; 
} 
a img { 
    border: none; 
    text-decoration: none; 
} 
img { 
    border: none; 
    text-decoration: none; 
} 
label, button { 
    cursor: pointer; 
} 
input:focus, select:focus, textarea:focus { 
     
} 
fieldset { 
    border: none; 
} 
.clear { 
    clear: both; 
} 
.float-left { 
    float: left; 
} 
.float-right { 
    float: right; 
} 
body { 
    text-align: center; 
} 
#wrapper { 
    margin: 0 auto; 
    text-align: left; 
}

/*十四. Anieto2K Reset CSS*/


html, body, div, span, applet, object, iframe, 
h1, h2, h3, h4, h5, h6, p, 
blockquote, pre, a, abbr, acronym, address, big, 
cite, code, del, dfn, em, font, img, 
ins, kbd, q, s, samp, small, strike, 
strong, sub, sup, tt, var, dl, dt, dd, ol, ul, li, 
fieldset, form, label, legend, 
table, caption, tbody, tfoot, thead, tr, th, td, 
center, u, b, i { 
    margin: 0; 
    padding: 0; 
    border: 0; 
    outline: 0; 
    font-weight: normal; 
    font-style: normal; 
    font-size: 100%; 
    font-family: inherit; 
    vertical-align: baseline 
} 
body { 
    line-height: 1 
} 
:focus { 
    outline: 0 
} 
ol, ul { 
    list-style: none 
} 
table { 
    border-collapse: collapse; 
    border-spacing: 0 
} 
blockquote:before, blockquote:after, q:before, q:after { 
    content: “” 
} 
blockquote, q { 
    quotes: “” “” 
} 
input, textarea { 
    margin: 0; 
    padding: 0 
} 
hr { 
    margin: 0; 
    padding: 0; 
    border: 0; 
    color: #000; 
     
    height: 1px 
}

/*十五.CSSLab CSS Reset*/


html, body, div, span, applet, object, iframe, h1, h2, h3, 
h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, 
big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, 
small, strike, strong, sub, sup, tt, var, dl, dt, dd, ol, ul, li, 
fieldset, form, label, legend, table, caption, tbody, tfoot, 
thead, tr, th, td { 
    margin: 0; 
    padding: 0; 
    border: 0; 
    outline: 0; 
    font-weight: inherit; 
    font-style: inherit; 
    font-size: 100%; 
    font-family: inherit; 
    vertical-align: baseline; 
} 
:focus { 
    outline: 0; 
} 
table { 
    border-collapse: separate; 
    border-spacing: 0; 
} 
caption, th, td { 
    text-align: left; 
    font-weight: normal; 
} 
a img, iframe { 
    border: none; 
} 
ol, ul { 
    list-style: none; 
} 
input, textarea, select, button { 
    font-size: 100%; 
    font-family: inherit; 
} 
select { 
    margin: inherit; 
} 
/* Fixes incorrect placement of numbers in ol’s in IE6/7 */ 
ol { margin-left:2em; } 
/* == clearfix == */ 
.clearfix:after { 
    content: “.”; 
    display: block; 
    height: 0; 
    clear: both; 
    visibility: hidden; 
} 
.clearfix {display: inline-block;} 
* html .clearfix {height: 1%;} 
.clearfix {display: block;}

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