normalize.css可以對css初始化，不同瀏覽器可以統一初始樣式

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/*! normalize.css v7.0.0 | 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 *    IE on Windows Phone and in iOS. */html {  line-height: 1.15;  /* 1 */  -ms-text-size-adjust: 100%;  /* 2 */  -webkit-text-size-adjust: 100%  /* 2 */}/* Sections   ========================================================================== *//** * Remove the margin in all browsers (opinionated). */body {  margin: 0;}/** * Add the correct display in IE 9-. */article,aside,footer,header,nav,section {  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   ========================================================================== *//** * Add the correct display in IE 9-. * 1. Add the correct display in IE. */figcaption,figure,main {  /* 1 */  display: block;}/** * Add the correct margin in IE 8. */figure {  margin: 1em 40px;}/** * 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   ========================================================================== *//** * 1. Remove the gray background on active links in IE 10. * 2. Remove gaps in links underline in iOS 8+ and Safari 8+. */a {  background-color: transparent;  /* 1 */  -webkit-text-decoration-skip: objects  /* 2 */}/** * 1. Remove the bottom border in Chrome 57- and Firefox 39-. * 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 */}/** * Prevent the duplicate application of `bolder` by the next rule in Safari 6. */b,strong {  font-weight: inherit;}/** * 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 style in Android 4.3-. */dfn {  font-style: italic;}/** * Add the correct background and color in IE 9-. */mark {  background-color: #ff0;  color: #000;}/** * 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   ========================================================================== *//** * Add the correct display in IE 9-. */audio,video {  display: inline-block;}/** * Add the correct display in iOS 4-7. */audio:not([controls]) {  display: none;  height: 0;}/** * Remove the border on images inside links in IE 10-. */img {  border-style: none;}/** * Hide the overflow in IE. */svg:not(:root) {  overflow: hidden;}/* Forms   ========================================================================== *//** * 1. Change the font styles in all browsers (opinionated). * 2. Remove the margin in Firefox and Safari. */button,input,optgroup,select,textarea {  font-family: sans-serif;  /* 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;}/** * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video` *    controls in Android 4. * 2. Correct the inability to style clickable types in iOS and Safari. */button,html [type="button"],[type="reset"],[type="submit"] {  -webkit-appearance: button  /* 2 */}/** * 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 */}/** * 1. Add the correct display in IE 9-. * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera. */progress {  display: inline-block;  /* 1 */  vertical-align: baseline  /* 2 */}/** * Remove the default vertical scrollbar in IE. */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 and cancel buttons in Chrome and Safari on macOS. */[type="search"]::-webkit-search-cancel-button,[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 IE 9-. * 1. Add the correct display in Edge, IE, and Firefox. */details,menu {  display: block;}/* * Add the correct display in all browsers. */summary {  display: list-item;}/* Scripting   ========================================================================== *//** * Add the correct display in IE 9-. */canvas {  display: inline-block;}/** * Add the correct display in IE. */template {  display: none;}/* Hidden   ========================================================================== *//** * Add the correct display in IE 10-. */[hidden] {  display: none;}

　　

normalize.css可以對css初始化，不同瀏覽器可以統一初始樣式