CSS Reset（样式重置）

CSS Reset，意为重置默认样式。HTML中绝大部分标签元素在网页显示中都有一个默认属性值，通常为了避免重复定义元素样式，需要进行重置默认样式（CSS Reset）。举几个例子：
1.淘宝（CSS Reset）：
html {
overflow-x:auto;
overflow-y:scroll;
}
body, dl, dt, dd, ul, ol, li, pre, form, fieldset, input, p, blockquote, th, td {
font-weight:400;
margin:0;
padding:0;
}
h1, h2, h3, h4, h4, h5 {
margin:0;
padding:0;
}
body {
background-color:#FFFFFF;
color:#666666;
font-family:Helvetica,Arial,sans-serif;
font-size:12px;
padding:0 10px;
text-align:left;
}
select {
font-size:12px;
}
table {
border-collapse:collapse;
}
fieldset, img {
border:0 none;
}
fieldset {
margin:0;
padding:0;
}
fieldset p {
margin:0;
padding:0 0 0 8px;
}
legend {
display:none;
}
address, caption, em, strong, th, i {
font-style:normal;
font-weight:400;
}
table caption {
margin-left:-1px;
}
hr {
border-bottom:1px solid #FFFFFF;
border-top:1px solid #E4E4E4;
border-width:1px 0;
clear:both;
height:2px;
margin:5px 0;
overflow:hidden;
}
ol, ul {
list-style-image:none;
list-style-position:outside;
list-style-type:none;
}
caption, th {
text-align:left;
}
q:before, q:after, blockquote:before, blockquote:after {
content:””;
}
2.百度（CSS Reset）：
body {
font-family:arial,helvetica,sans-serif;
font-size:13px;
font-size-adjust:none;
font-stretch:normal;
font-style:normal;
font-variant:normal;
font-weight:normal;
line-height:1.4;
text-align:center;
}
body, ul, ol, dl, dd, h1, h2, h3, h4, h5, h6, p, form, fieldset, legend, input, textarea, select, button, th, td {
margin:0;
padding:0;
}
h1, h2, h3, h4, h5, h6 {
font-size:100%;
font-weight:normal;
}
table {
font-size:inherit;
}
input, select {
font-family:arial,helvetica,clean,sans-serif;
font-size:100%;
font-size-adjust:none;
font-stretch:normal;
font-style:normal;
font-variant:normal;
font-weight:normal;
line-height:normal;
}
button {
overflow:visible;
}
th, em, strong, b, address, cite {
font-style:normal;
font-weight:normal;
}
li {
list-style-image:none;
list-style-position:outside;
list-style-type:none;
}
img, fieldset {
border:0 none;
}
ins {
text-decoration:none;
}
3.《超越css》（CSS Reset）：
/* Normalizes margin,padding /
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,p,blockquote,th,td { margin:0;padding:0}
/ Normalizes font-size for headers /
h1,h2,h3,h4,h5,h6 { font-size:100%}
/ Removes list-style from lists /
ol,ul { list-style:none }
/ Normalizes font-size and font-weight to normal /
address,caption,cite,code,dfn,em,strong,th,var { font-size:normal; font-weight:normal }
/ Removes list-style from lists /
table { border-collapse:collapse; border-spacing:0 }
/ Removes border from fieldset and img /
fieldset,img { border:0 }
/ Left-aligns text in caption and th /
caption,th { text-align:left }
/ Removes quotation marks from q /
q:before,q:after { content:”}
4.Eric Meyer（CSS Reset）——推荐：
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,
b, u, i, center,
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-size: 100%;
vertical-align: baseline;
background: transparent;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: ”;
content: none;
}
/ remember to define focus styles! /
:focus {
outline: 0;
}
/ remember to highlight inserts somehow! /
ins {
text-decoration: none;
}
del {
text-decoration: line-through;
}
/ tables still need ‘cellspacing=”0″‘ in the markup */
table {
border-collapse: collapse;
border-spacing: 0;
}
5.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 {
margin:0;
padding:0;
}
table {
border-collapse:collapse;
border-spacing:0;
}
fieldset,img {
border:0;
}
address,caption,cite,code,dfn,em,strong,th,var {
font-style:normal;
font-weight:normal;
}
ol,ul {
list-style:none;
}
caption,th {
text-align:left;
}
h1,h2,h3,h4,h5,h6 {
font-size:100%;
font-weight:normal;
}
q:before,q:after {
content:”;
}
abbr,acronym {
border:0;
}

移动端CSS初始化reset.css

html {
font-family: "Helvetica Neue", Helvetica, STHeiTi, Arial, sans-serif;
-ms-text-size-adjust: 100%;
-webkit-text-size-adjust: 100%;
font-size: 62.5%;
}

body {
margin: 0;
font-size: 1.4rem;
line-height: 1.5;
color: #333333;
background-color: white;
height: 100%;
overflow-x: hidden;
-webkit-overflow-scrolling: touch;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
display: block;
}

audio,
canvas,
progress,
video {
display: inline-block;
vertical-align: baseline;
}

audio:not([controls]) {
display: none;
height: 0;
}

[hidden],
template {
display: none;
}

svg:not(:root) {
overflow: hidden;
}

a {
background: transparent;
text-decoration: none;
-webkit-tap-highlight-color: transparent;
color: #0088cc;
}

a:active {
outline: 0;
}

a:active {
color: #006699;
}

abbr[title] {
border-bottom: 1px dotted;
}

b,
strong {
font-weight: bold;
}

dfn {
font-style: italic;
}

mark {
background: #ff0;
color: #000;
}

small {
font-size: 80%;
}

sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}

sup {
top: -0.5em;
}

sub {
bottom: -0.25em;
}

img {
border: 0;
vertical-align: middle;
}

hr {
-moz-box-sizing: content-box;
box-sizing: content-box;
height: 0;
}

pre {
overflow: auto;
white-space: pre;
white-space: pre-wrap;
word-wrap: break-word;
}

code,
kbd,
pre,
samp {
font-family: monospace, monospace;
font-size: 1em;
}

button,
input,
optgroup,
select,
textarea {
color: inherit;
font: inherit;
margin: 0;
}

button {
overflow: visible;
}

button,
select {
text-transform: none;
}

button,
html input[type="button"],
input[type="reset"],
input[type="submit"] {
-webkit-appearance: button;
cursor: pointer;
}

button[disabled],
html input[disabled] {
cursor: default;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
border: 0;
padding: 0;
}

input {
line-height: normal;
}

input[type="checkbox"],
input[type="radio"] {
box-sizing: border-box;
padding: 0;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
height: auto;
}

input[type="search"] {
-webkit-appearance: textfield;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}

input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}

fieldset {
border: 1px solid #c0c0c0;
margin: 0 2px;
padding: 0.35em 0.625em 0.75em;
}

legend {
border: 0;
padding: 0;
}

textarea {
overflow: auto;
resize: vertical;
}

optgroup {
font-weight: bold;
}

table {
border-collapse: collapse;
border-spacing: 0;
}

td,
th {
padding: 0;
}

html,
button,
input,
select,
textarea {
font-family: "Helvetica Neue", Helvetica, STHeiTi, Arial, sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
form,
blockquote {
margin: 0;
}

ul,
ol,
li,
dl,
dd {
margin: 0;
padding: 0;
}

ul,
ol {
list-style: none outside none;
}

h1,
h2,
h3 {
line-height: 2;
font-weight: normal;
}

h1 {
font-size: 1.8rem;
}

h2 {
font-size: 1.6rem;
}

h3 {
font-size: 1.4rem;
}

input::-moz-placeholder,
textarea::-moz-placeholder {
color: #cccccc;
}

input:-ms-input-placeholder,
textarea:-ms-input-placeholder {
color: #cccccc;
}

input::-webkit-input-placeholder,
textarea::-webkit-input-placeholder {
color: #cccccc;
}

• {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  }

转载自：https://blog.csdn.net/eason_severus/article/details/53665074