HTML5 重置样式 normalize.css

/*! normalize.css v7.0.0 | MIT License | github.com/necolas/normalize.css */

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,
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-weight: inherit;
font-style: inherit;
font-size: 100%;
font-family: inherit;
vertical-align: baseline;
}
/* remember to define focus styles! */
:focus {
outline: 0;
}

/* 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"], /* 1 /
[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-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-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, /* 1 */
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;
}