css reset

/*! normalize.css 2012-03-11T12:53 UTC - http://github.com/necolas/normalize.css */

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

/*
 * Corrects block display not defined in IE6/7/8/9 & FF3
 */

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

/*
 * Corrects inline-block display not defined in IE6/7/8/9 & FF3
 */

audio,
canvas,
video {
    display: inline-block;
    *display: inline;
    *zoom: 1;
}

/*
 * Prevents modern browsers from displaying 'audio' without controls
 * Remove excess height in iOS5 devices
 */

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

/*
 * Addresses styling for 'hidden' attribute not present in IE7/8/9, FF3, S4
 * Known issue: no IE6 support
 */

[hidden] {
    display: none;
}


/* =============================================================================
   Base
   ========================================================================== */

/*
 * 1. Corrects text resizing oddly in IE6/7 when body font-size is set using em units
 *    http://clagnut.com/blog/348/#c790
 * 2. Prevents iOS text size adjust after orientation change, without disabling user zoom
 *    www.456bereastreet.com/archive/201012/controlling_text_size_in_safari_for_ios_without_disabling_user_zoom/
 */

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

/*
 * Addresses font-family inconsistency between 'textarea' and other form elements.
 */

html,
button,
input,
select,
textarea {
    font-family: sans-serif;
}

/*
 * Addresses margins handled incorrectly in IE6/7
 */

body {
    margin: 0;
}


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

/*
 * Addresses outline displayed oddly in Chrome
 */

a:focus {
    outline: thin dotted;
}

/*
 * Improves readability when focused and also mouse hovered in all browsers
 * people.opera.com/patrickl/experiments/keyboard/test
 */

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


/* =============================================================================
   Typography
   ========================================================================== */

/*
 * Addresses font sizes and margins set differently in IE6/7
 * Addresses font sizes within 'section' and 'article' in FF4+, Chrome, S5
 */

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

h2 {
    font-size: 1.5em;
    margin: 0.83em 0;
}

h3 {
    font-size: 1.17em;
    margin: 1em 0;
}

h4 {
    font-size: 1em;
    margin: 1.33em 0;
}

h5 {
    font-size: 0.83em;
    margin: 1.67em 0;
}

h6 {
    font-size: 0.75em;
    margin: 2.33em 0;
}

/*
 * Addresses styling not present in IE7/8/9, S5, Chrome
 */

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

/*
 * Addresses style set to 'bolder' in FF3+, S4/5, Chrome
*/

b,
strong {
    font-weight: bold;
}

blockquote {
    margin: 1em 40px;
}

/*
 * Addresses styling not present in S5, Chrome
 */

dfn {
    font-style: italic;
}

/*
 * Addresses styling not present in IE6/7/8/9
 */

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

/*
 * Addresses margins set differently in IE6/7
 */

p,
pre {
    margin: 1em 0;
}

/*
 * Corrects font family set oddly in IE6, S4/5, Chrome
 * en.wikipedia.org/wiki/User:Davidgothberg/Test59
 */

pre,
code,
kbd,
samp {
    font-family: monospace, serif;
    _font-family: 'courier new', monospace;
    font-size: 1em;
}

/*
 * Improves readability of pre-formatted text in all browsers
 */

pre {
    white-space: pre;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/*
 * 1. Addresses CSS quotes not supported in IE6/7
 * 2. Addresses quote property not supported in S4
 */

/* 1 */

q {
    quotes: none;
}

/* 2 */

q:before,
q:after {
    content: '';
    content: none;
}

small {
    font-size: 75%;
}

/*
 * Prevents sub and sup affecting line-height in all browsers
 * gist.github.com/413930
 */

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

sup {
    top: -0.5em;
}

sub {
    bottom: -0.25em;
}


/* =============================================================================
   Lists
   ========================================================================== */

/*
 * Addresses margins set differently in IE6/7
 */

dl,
menu,
ol,
ul {
    margin: 1em 0;
}

dd {
    margin: 0 0 0 40px;
}

/*
 * Addresses paddings set differently in IE6/7
 */

menu,
ol,
ul {
    padding: 0 0 0 40px;
}

/*
 * Corrects list images handled incorrectly in IE7
 */

nav ul,
nav ol {
    list-style: none;
    list-style-image: none;
}


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

/*
 * 1. Removes border when inside 'a' element in IE6/7/8/9, FF3
 * 2. Improves image quality when scaled in IE7
 *    code.flickr.com/blog/2008/11/12/on-ui-quality-the-little-things-client-side-image-resizing/
 */

img {
    border: 0; /* 1 */
    -ms-interpolation-mode: bicubic; /* 2 */
}

/*
 * Corrects overflow displayed oddly in IE9
 */

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


/* =============================================================================
   Figures
   ========================================================================== */

/*
 * Addresses margin not present in IE6/7/8/9, S5, O11
 */

figure {
    margin: 0;
}


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

/*
 * Corrects margin displayed oddly in IE6/7
 */

form {
    margin: 0;
}

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

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

/*
 * 1. Corrects color not being inherited in IE6/7/8/9
 * 2. Corrects text not wrapping in FF3
 * 3. Corrects alignment displayed oddly in IE6/7
 */

legend {
    border: 0; /* 1 */
    padding: 0;
    white-space: normal; /* 2 */
    *margin-left: -7px; /* 3 */
}

/*
 * 1. Corrects font size not being inherited in all browsers
 * 2. Addresses margins set differently in IE6/7, FF3+, S5, Chrome
 * 3. Improves appearance and consistency in all browsers
 */

button,
input,
select,
textarea {
    font-size: 100%; /* 1 */
    margin: 0; /* 2 */
    vertical-align: baseline; /* 3 */
    *vertical-align: middle; /* 3 */
}

/*
 * Addresses FF3/4 setting line-height on 'input' using !important in the UA stylesheet
 */

button,
input {
    line-height: normal; /* 1 */
}

/*
 * 1. Improves usability and consistency of cursor style between image-type 'input' and others
 * 2. Corrects inability to style clickable 'input' types in iOS
 * 3. Removes inner spacing in IE7 without affecting normal text inputs
 *    Known issue: inner spacing remains in IE6
 */

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

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

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

/*
 * 1. Addresses box sizing set to content-box in IE8/9
 * 2. Removes excess padding in IE8/9
 * 3. Removes excess padding in IE7
      Known issue: excess padding remains in IE6
 */

input[type="checkbox"],
input[type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
    *height: 13px; /* 3 */
    *width: 13px; /* 3 */
}

/*
 * 1. Addresses appearance set to searchfield in S5, Chrome
 * 2. Addresses box-sizing set to border-box in S5, 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;
}

/*
 * Removes inner padding and search cancel button in S5, Chrome on OS X
 */

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

/*
 * Removes inner padding and border in FF3+
 * www.sitepen.com/blog/2008/05/14/the-devils-in-the-details-fixing-dojos-toolbar-buttons/
 */

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

/*
 * 1. Removes default vertical scrollbar in IE6/7/8/9
 * 2. Improves readability and alignment in all browsers
 */

textarea {
    overflow: auto; /* 1 */
    vertical-align: top; /* 2 */
}


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

/*
 * Remove most spacing between table cells
 */

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

### CSS Reset 介绍 CSS Reset 即重置 CSS,也就是重置默认样式。不同浏览器对 HTML 元素有不同的默认样式规则,Reset 通过覆盖这些默认值,确保在所有浏览器中起点一致,避免在 CSS 中重复定义元素的默认样式,让开发者可以从一个统一的基础开始设计页面样式 [^1][^2]。 以前常用 `*{margin:0;padding:0}` 来进行样式重置,但这种方式格式化太严重,逐渐被废弃。国内大型门户如 QQ、淘宝等在进行 CSS Reset 时均有 YUI 的影子,业内使用较多的还有 Erik Meyer’s CSS Reset [^1]。 ### CSS Reset 使用 以下为几种常见的使用方式: #### 手动编写简单的 CSS Reset 可以编写一个简单的 CSS 文件,覆盖常见元素的默认样式。例如: ```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, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; } article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } body { line-height: 1; } ol, ul { list-style: none; } blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; } table { border-collapse: collapse; border-spacing: 0; } ``` 将上述代码保存为 `reset.css` 文件,然后在 HTML 文件或前端框架的入口文件中引入: ```html <link rel="stylesheet" href="reset.css"> ``` 在 UniApp 开发中,可以在 `App.vue` 中引入: ```vue <style> @import './reset.css'; /* 其他样式 */ </style> ``` #### 使用第三方 CSS Reset 库 - **normalize.css**:更温和,会保留一些有用的默认样式。可以通过 npm 安装: ```bash npm install normalize.css ``` 安装完成后,在项目入口文件中引入: ```javascript // 在 JavaScript 入口文件中引入 import 'normalize.css'; ``` 在 UniApp 的 `App.vue` 中引入: ```vue <style> @import 'normalize.css'; /* 其他样式 */ </style> ```
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