bootstrap源码之初始化
我们先来分析normalize.less编译后的源码,我们知道normalize.css是一个专门将不同浏览器的默认css特性设置为统一效果的css库,它和reset.css还是有区别的，normalize.css并不是简单的重置了所有的样式，而是有针对的修改，同时也保留了标签的语义化。
技能一：
html {
font-family: sans-serif;
-webkit-text-size-adjust: 100%; //防止IOS系统方向改变(特别是手持设备)后字体大小的调整，不禁用用户缩放。
-ms-text-size-adjust: 100%;
}
text-size-adjust：auto | none | <percentage>
检索或设置移动端页面中对象文本的大小调整。
- 该属性只在移动设备上生效；
- 如果你的页面没有定义
meta viewport，此属性定义将无效； - 对应的脚本特性为textSizeAdjust。
技能二：
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
menu,
nav,
section,
summary {
display: block; //修正IE中未定义的html5块状元素
}
技能三：
audio:not([controls]) {//否定伪类,匹配所有没有controls属性的audio
display: none; //防止现代浏览器显示没有控制条的音频。
height: 0; //在iOS5设备中去除多余的高度。
}
audio 这个标签在移动端是设备会出现多余的高度 在iPhone5上 自动会出现播放控制栏 这个标签的兼容 要重视哦
技能四：
template {//template标签主要用于声明是“模板元素”。
display: none; //template标签和有hidden属性的元素不显示
}
技能五：
mark { //部分文本高亮显示,请在需要突出显示文本时使用
color: #000;
background: #ff0;
}
技能六：
sub,
sup { //防止sub sup影响行高
position: relative;
font-size: 75%;
line-height: 0;
vertical-align: baseline;
}
技能七：
svg:not(:root) {//非根目录的svg标签
overflow: hidden;
}
技能八：
input::-moz-focus-inner { //删除在火狐浏览器4及以上中的按钮的内部填充和边框
padding: 0;
border: 0;
}
技能九：
fieldset {//将表单内的相关元素分组。
padding: .35em .625em .75em;
margin: 0 2px;
border: 1px solid #c0c0c0;
}
技能十：
optgroup {//用于把相关的选项组合在一起。
font-weight: bold;
}
还是贴一份源码出来 这样大家阅读文章的时候，顺便吧源码给读了
/*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css */ //
// 1. Set default font family to sans-serif.
// 2. Prevent iOS and IE text size adjust after device 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 8/9/10/11, 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 of focused elements when they are also in an
// active/hover state.
// 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 {
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.
// input[type="search"] {
-webkit-appearance: textfield; // 1
box-sizing: content-box; //2
} //
// 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;
}
后言：
作者的注释已经写得很好了，我只是摘抄翻译了几个 ，你觉得还有很不错的，欢迎评论走起
本人最近一直在阅读bootstrap的源码，发现更多好玩的分享后期分享给大家。这也是给自己的一分笔记，毕竟我读过嘛~