重置浏览器默认样式 normalize.css

1 /*! 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:;
 }

 /**
  * 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:; /* 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:;
   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:; /* 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:;
 }

 /**
  * 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:; /* 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:; /* 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;
 }

来源：http://necolas.github.io/normalize.css/