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保护有用的浏览器默认样式而不是完全去掉它们一般化的样式：为大部分HTML元素提供修复浏览器自身的bug并保证各浏览器的一致性优化CSS可用性：用一些小技巧解释代码：用注释和详细的文档来

/*! 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;}

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