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  • 样式表的重置

    /*! normalize.css v3.0.2 | MIT License | git.io/normalize */

    /**
    * 1. Set default font family to sans-serif.
    * 2. Prevent iOS text size adjust after orientation change, without disabling
    * user zoom.
    */

    html {
    font-family: sans-serif; /* 1 */
    -ms-text-size-adjust: 100%; /* 2 */
    -webkit-text-size-adjust: 100%; /* 2 */
    }

    /**
    * Remove default margin.
    */

    body {
    margin: 0;
    }

    /* HTML5 display definitions
    ========================================================================== */

    /**
    * Correct `block` display not defined for any HTML5 element in IE 8/9.
    * Correct `block` display not defined for `details` or `summary` in IE 10/11
    * and Firefox.
    * Correct `block` display not defined for `main` in IE 11.
    */

    article,
    aside,
    details,
    figcaption,
    figure,
    footer,
    header,
    hgroup,
    main,
    menu,
    nav,
    section,
    summary {
    display: block;
    }

    /**
    * 1. Correct `inline-block` display not defined in IE 8/9.
    * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
    */

    audio,
    canvas,
    progress,
    video {
    display: inline-block; /* 1 */
    vertical-align: baseline; /* 2 */
    }

    /**
    * Prevent modern browsers from displaying `audio` without controls.
    * Remove excess height in iOS 5 devices.
    */

    audio:not([controls]) {
    display: none;
    height: 0;
    }

    /**
    * Address `[hidden]` styling not present in IE 8/9/10.
    * Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
    */

    [hidden],
    template {
    display: none;
    }

    /* Links
    ========================================================================== */

    /**
    * Remove the gray background color from active links in IE 10.
    */

    a {
    background-color: transparent;
    }

    /**
    * Improve readability when focused and also mouse hovered in all browsers.
    */

    a:active,
    a:hover {
    outline: 0;
    }

    /* Text-level semantics
    ========================================================================== */

    /**
    * Address styling not present in IE 8/9/10/11, Safari, and Chrome.
    */

    abbr[title] {
    border-bottom: 1px dotted;
    }

    /**
    * Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
    */

    b,
    strong {
    font-weight: bold;
    }

    /**
    * Address styling not present in Safari and Chrome.
    */

    dfn {
    font-style: italic;
    }

    /**
    * Address variable `h1` font-size and margin within `section` and `article`
    * contexts in Firefox 4+, Safari, and Chrome.
    */

    h1 {
    font-size: 2em;
    margin: 0.67em 0;
    }

    /**
    * Address styling not present in IE 8/9.
    */

    mark {
    background: #ff0;
    color: #000;
    }

    /**
    * Address inconsistent and variable font size in all browsers.
    */

    small {
    font-size: 80%;
    }

    /**
    * Prevent `sub` and `sup` affecting `line-height` in all browsers.
    */

    sub,
    sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
    }

    sup {
    top: -0.5em;
    }

    sub {
    bottom: -0.25em;
    }

    /* Embedded content
    ========================================================================== */

    /**
    * Remove border when inside `a` element in IE 8/9/10.
    */

    img {
    border: 0;
    }

    /**
    * Correct overflow not hidden in IE 9/10/11.
    */

    svg:not(:root) {
    overflow: hidden;
    }

    /* Grouping content
    ========================================================================== */

    /**
    * Address margin not present in IE 8/9 and Safari.
    */

    figure {
    margin: 1em 40px;
    }

    /**
    * Address differences between Firefox and other browsers.
    */

    hr {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    height: 0;
    }

    /**
    * Contain overflow in all browsers.
    */

    pre {
    overflow: auto;
    }

    /**
    * Address odd `em`-unit font size rendering in all browsers.
    */

    code,
    kbd,
    pre,
    samp {
    font-family: monospace, monospace;
    font-size: 1em;
    }

    /* Forms
    ========================================================================== */

    /**
    * Known limitation: by default, Chrome and Safari on OS X allow very limited
    * styling of `select`, unless a `border` property is set.
    */

    /**
    * 1. Correct color not being inherited.
    * Known issue: affects color of disabled elements.
    * 2. Correct font properties not being inherited.
    * 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
    */

    button,
    input,
    optgroup,
    select,
    textarea {
    color: inherit; /* 1 */
    font: inherit; /* 2 */
    margin: 0; /* 3 */
    }

    /**
    * Address `overflow` set to `hidden` in IE 8/9/10/11.
    */

    button {
    overflow: visible;
    }

    /**
    * Address inconsistent `text-transform` inheritance for `button` and `select`.
    * All other form control elements do not inherit `text-transform` values.
    * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
    * Correct `select` style inheritance in Firefox.
    */

    button,
    select {
    text-transform: none;
    }

    /**
    * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
    * and `video` controls.
    * 2. Correct inability to style clickable `input` types in iOS.
    * 3. Improve usability and consistency of cursor style between image-type
    * `input` and others.
    */

    button,
    html input[type="button"], /* 1 */
    input[type="reset"],
    input[type="submit"] {
    -webkit-appearance: button; /* 2 */
    cursor: pointer; /* 3 */
    }

    /**
    * Re-set default cursor for disabled elements.
    */

    button[disabled],
    html input[disabled] {
    cursor: default;
    }

    /**
    * Remove inner padding and border in Firefox 4+.
    */

    button::-moz-focus-inner,
    input::-moz-focus-inner {
    border: 0;
    padding: 0;
    }

    /**
    * Address Firefox 4+ setting `line-height` on `input` using `!important` in
    * the UA stylesheet.
    */

    input {
    line-height: normal;
    }

    /**
    * It's recommended that you don't attempt to style these elements.
    * Firefox's implementation doesn't respect box-sizing, padding, or width.
    *
    * 1. Address box sizing set to `content-box` in IE 8/9/10.
    * 2. Remove excess padding in IE 8/9/10.
    */

    input[type="checkbox"],
    input[type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
    }

    /**
    * Fix the cursor style for Chrome's increment/decrement buttons. For certain
    * `font-size` values of the `input`, it causes the cursor style of the
    * decrement button to change from `default` to `text`.
    */

    input[type="number"]::-webkit-inner-spin-button,
    input[type="number"]::-webkit-outer-spin-button {
    height: auto;
    }

    /**
    * 1. Address `appearance` set to `searchfield` in Safari and Chrome.
    * 2. Address `box-sizing` set to `border-box` in Safari and Chrome
    * (include `-moz` to future-proof).
    */

    input[type="search"] {
    -webkit-appearance: textfield; /* 1 */
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box; /* 2 */
    box-sizing: content-box;
    }

    /**
    * Remove inner padding and search cancel button in Safari and Chrome on OS X.
    * Safari (but not Chrome) clips the cancel button when the search input has
    * padding (and `textfield` appearance).
    */

    input[type="search"]::-webkit-search-cancel-button,
    input[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
    }

    /**
    * Define consistent border, margin, and padding.
    */

    fieldset {
    border: 1px solid #c0c0c0;
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
    }

    /**
    * 1. Correct `color` not being inherited in IE 8/9/10/11.
    * 2. Remove padding so people aren't caught out if they zero out fieldsets.
    */

    legend {
    border: 0; /* 1 */
    padding: 0; /* 2 */
    }

    /**
    * Remove default vertical scrollbar in IE 8/9/10/11.
    */

    textarea {
    overflow: auto;
    }

    /**
    * Don't inherit the `font-weight` (applied by a rule above).
    * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
    */

    optgroup {
    font-weight: bold;
    }

    /* Tables
    ========================================================================== */

    /**
    * Remove most spacing between table cells.
    */

    table {
    border-collapse: collapse;
    border-spacing: 0;
    }

    td,
    th {
    padding: 0;
    }

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  • 原文地址:https://www.cnblogs.com/fjqq/p/4685517.html
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