目录
一、为什么要重置CSS？
二、如何重置CSS
三、重置方案
1.自定义重置（博主推荐）
2.官方推荐重置（Normalize.css）
2.1.normalize.css并不是简单的重置了所有的样式，保留标签语义化
2.2.normalize.css覆盖更多的标签
2.3.normalize.css源码，注释写的很详细
2.4.补充
一、为什么要重置CSS？
html标签在浏览器中都有各自的默认样式，比如： p 标签有上下边距，strong标签有字体加粗样式，em标签有字体倾斜样式。不同浏览器的默认样式之间也会有差别，例如ul默认带有缩进的样式，在IE 下，它的缩进是通过margin实现的，而Firefox下，它的缩进是由padding实现的。在切换页面的时候，浏览器的默认样式往往会给我们带来麻 烦，影响开发效率。
二、如何重置CSS
解决的方法就是一开始就将浏览器的默认样式全部去掉，更准确说就是通过重新定义标签样式。覆盖浏览器的CSS默认属性。最最简 单的说法就是把浏览器提供的默认样式覆盖掉！这就是CSS reset。
三、重置方案
1.自定义重置（博主推荐）
html,
body {
height: 100%;
/* 文字风格 Sans-serif 各笔画粗细相同，Serif 笔画粗细不同，monospace 等宽体，cursive草书，fantasy梦幻 */
font-family: 'Microsoft YaHei', sans-serif, 'Helvetica Neue', Helvetica, Arial,
'黑体', '宋体', Arial;
-webkit-tap-highlight-color: transparent;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
body {
font-size: 14px;
color: #333;
}
/* 重置各标签的默认样式 */
a,
body,
center,
cite,
code,
dd,
del,
div,
dl,
dt,
em,
fieldset,
figcaption,
figure,
footer,
form,
h1,
h2,
h3,
h4,
h5,
h6,
header,
hr,
html,
img,
input,
label,
legend,
li,
mark,
ol,
p,
section,
span,
textarea,
time,
td,
th,
ul {
margin: 0;
border: 0;
padding: 0;
font-style: normal;
box-sizing: border-box;
/* 自动换行 */
word-wrap: break-word;
/* 强制英文单词断行 */
word-break: break-all;
}
/* 设置标签为块级分类 */
article,
aside,
details,
fieldset,
figcaption,
figure,
footer,
header,
main,
nav,
section {
display: block;
}
/* 去除input标签的默认样式 */
button,
input,
textarea {
-webkit-appearance: none;
font-family: 'Microsoft YaHei', sans-serif, 'Helvetica Neue', Helvetica, Arial,
'黑体', '宋体', Arial;
border: 0;
margin: 0;
padding: 0;
font-size: 1em;
line-height: 1em;
outline: none;
background-color: transparent;
}
/* 禁止多文本框手动拖动大小 */
textarea {
resize: none;
-webkit-appearance: none;
}
/* 去掉按下的阴影盒子 */
input,
textarea,
a {
-webkit-tap-highlight-color: transparent;
}
/* 清除a标签下划线 */
a,
a:visited {
text-decoration: none;
}
a:focus,
a:active,
a:hover {
outline: none;
}
/* 清除列表前面的点 */
ol,
li,
ul {
list-style: none;
}
/* 清除IE下图片的边框 */
img {
border-style: none;
font-size: 0;
}
/* 解决chrome浏览器默认黄色背景问题 */
input:-webkit-autofill,
textarea:-webkit-autofill,
select:-webkit-autofill {
-webkit-box-shadow: 0 0 0 1000px #fff inset;
}
/* 设置默认滚动条样式 */
::-webkit-input-placeholder {
color: #afbdcc;
}
:-moz-placeholder {
color: #afbdcc;
}
::-moz-placeholder {
color: #afbdcc;
}
:-ms-input-placeholder {
color: #afbdcc;
}
::-webkit-scrollbar {
width: 6px;
height: 6px;
}
::-webkit-scrollbar-track {
background-color: #f5f5f5;
}
::-webkit-scrollbar-track-piece {
background-color: #f5f5f5;
border-radius: 6px;
}
::-webkit-scrollbar-thumb {
background-color: #cccccc;
border-radius: 6px;
}
::-webkit-scrollbar-corner {
background-color: #f5f5f5;
}
::-webkit-resizer {
background-repeat: no-repeat;
background-position: bottom right;
}2.官方推荐重置（Normalize.css）
优势：
2.1.normalize.css并不是简单的重置了所有的样式，保留标签语义化
normalize没有对所有标签采取一致的重置方式，而是有针对的修改，同时也保留了标签的语义化。
2.2.normalize.css覆盖更多的标签
这点体现在html5的标签上。
2.3.normalize.css源码，注释写的很详细
2.4.补充
在线CDN推荐：
normalize (v8.0.1) - Normalize.css 使浏览器呈现所有 HTML 元素更加一致，并且符合现代 web 标准。Normalize.css 只作用于需要规范化的样式。 | BootCDN - Bootstrap 中文网开源项目免费 CDN 加速服务
资源下载地址：
Normalize.css: Make browsers render all elements more consistently.
源码如下：
/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
/* Document
========================================================================== */
/**
* 1. Correct the line height in all browsers.
* 2. Prevent adjustments of font size after orientation changes in iOS.
*/
html {
line-height: 1.15; /* 1 */
-webkit-text-size-adjust: 100%; /* 2 */
}
/* Sections
========================================================================== */
/**
* Remove the margin in all browsers.
*/
body {
margin: 0;
}
/**
* Render the `main` element consistently in IE.
*/
main {
display: block;
}
/**
* Correct the font size and margin on `h1` elements within `section` and
* `article` contexts in Chrome, Firefox, and Safari.
*/
h1 {
font-size: 2em;
margin: 0.67em 0;
}
/* Grouping content
========================================================================== */
/**
* 1. Add the correct box sizing in Firefox.
* 2. Show the overflow in Edge and IE.
*/
hr {
box-sizing: content-box; /* 1 */
height: 0; /* 1 */
overflow: visible; /* 2 */
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
pre {
font-family: monospace, monospace; /* 1 */
font-size: 1em; /* 2 */
}
/* Text-level semantics
========================================================================== */
/**
* Remove the gray background on active links in IE 10.
*/
a {
background-color: transparent;
}
/**
* 1. Remove the bottom border in Chrome 57-
* 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
*/
abbr[title] {
border-bottom: none; /* 1 */
text-decoration: underline; /* 2 */
text-decoration: underline dotted; /* 2 */
}
/**
* Add the correct font weight in Chrome, Edge, and Safari.
*/
b,
strong {
font-weight: bolder;
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
code,
kbd,
samp {
font-family: monospace, monospace; /* 1 */
font-size: 1em; /* 2 */
}
/**
* Add the correct font size in all browsers.
*/
small {
font-size: 80%;
}
/**
* Prevent `sub` and `sup` elements from affecting the line height in
* all browsers.
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sub {
bottom: -0.25em;
}
sup {
top: -0.5em;
}
/* Embedded content
========================================================================== */
/**
* Remove the border on images inside links in IE 10.
*/
img {
border-style: none;
}
/* Forms
========================================================================== */
/**
* 1. Change the font styles in all browsers.
* 2. Remove the margin in Firefox and Safari.
*/
button,
input,
optgroup,
select,
textarea {
font-family: inherit; /* 1 */
font-size: 100%; /* 1 */
line-height: 1.15; /* 1 */
margin: 0; /* 2 */
}
/**
* Show the overflow in IE.
* 1. Show the overflow in Edge.
*/
button,
input { /* 1 */
overflow: visible;
}
/**
* Remove the inheritance of text transform in Edge, Firefox, and IE.
* 1. Remove the inheritance of text transform in Firefox.
*/
button,
select { /* 1 */
text-transform: none;
}
/**
* Correct the inability to style clickable types in iOS and Safari.
*/
button,
[type="button"],
[type="reset"],
[type="submit"] {
-webkit-appearance: button;
}
/**
* Remove the inner border and padding in Firefox.
*/
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
border-style: none;
padding: 0;
}
/**
* Restore the focus styles unset by the previous rule.
*/
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
outline: 1px dotted ButtonText;
}
/**
* Correct the padding in Firefox.
*/
fieldset {
padding: 0.35em 0.75em 0.625em;
}
/**
* 1. Correct the text wrapping in Edge and IE.
* 2. Correct the color inheritance from `fieldset` elements in IE.
* 3. Remove the padding so developers are not caught out when they zero out
* `fieldset` elements in all browsers.
*/
legend {
box-sizing: border-box; /* 1 */
color: inherit; /* 2 */
display: table; /* 1 */
max-width: 100%; /* 1 */
padding: 0; /* 3 */
white-space: normal; /* 1 */
}
/**
* Add the correct vertical alignment in Chrome, Firefox, and Opera.
*/
progress {
vertical-align: baseline;
}
/**
* Remove the default vertical scrollbar in IE 10+.
*/
textarea {
overflow: auto;
}
/**
* 1. Add the correct box sizing in IE 10.
* 2. Remove the padding in IE 10.
*/
[type="checkbox"],
[type="radio"] {
box-sizing: border-box; /* 1 */
padding: 0; /* 2 */
}
/**
* Correct the cursor style of increment and decrement buttons in Chrome.
*/
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
/**
* 1. Correct the odd appearance in Chrome and Safari.
* 2. Correct the outline style in Safari.
*/
[type="search"] {
-webkit-appearance: textfield; /* 1 */
outline-offset: -2px; /* 2 */
}
/**
* Remove the inner padding in Chrome and Safari on macOS.
*/
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
/**
* 1. Correct the inability to style clickable types in iOS and Safari.
* 2. Change font properties to `inherit` in Safari.
*/
::-webkit-file-upload-button {
-webkit-appearance: button; /* 1 */
font: inherit; /* 2 */
}
/* Interactive
========================================================================== */
/*
* Add the correct display in Edge, IE 10+, and Firefox.
*/
details {
display: block;
}
/*
* Add the correct display in all browsers.
*/
summary {
display: list-item;
}
/* Misc
========================================================================== */
/**
* Add the correct display in IE 10+.
*/
template {
display: none;
}
/**
* Add the correct display in IE 10.
*/
[hidden] {
display: none;
}官方的注释很到位吧，欢迎在评论区交流。
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