Front-end interview questions CSS: https://my.oschina.net/u/3674939/blog/1637877
Front-end interview questions JavaScript: https://my.oschina.net/u/3674939/blog/1640595
Other front-end interview questions (security, performance, loading, etc.): https://my.oschina.net/u/3674939/blog/1643029
What's changed in HTML5
- New Semantic Elements
- Form enhancements
- new API
What is the meaning of semantic
- Easy for developers to understand
- Helps with SEO
- Machines can easily understand the structure
- semantic microdata
How to handle html5 new tag compatibility
Principle: IE8/IE7/IE6 supports tags generated by the document.createElement method
article,aside,dialog,footer,header,section,nav,figure,menu{display:block}
<!--[if lt IE 9]>
<script src="http://cdn.static.runoob.com/libs/html5shiv/3.7/html5shiv.min.js"></script>
<![endif]-->
The relationship between HTML and DOM
- HTML is text markup and is dead
- The DOM is parsed from HTML to generate a DOM tree, and JS can maintain the DOM
DOCTYPE understanding
Declare the doctype, telling the browser what doctype to use
possible meta tags
<!-- 设置缩放 -->
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no, minimal-ui" />
<!-- 可隐藏地址栏，仅针对IOS的Safari（注：IOS7.0版本以后，safari上已看不到效果） -->
<meta name="apple-mobile-web-app-capable" content="yes" />
<!-- 仅针对IOS的Safari顶端状态条的样式（可选default/black/black-translucent ） -->
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<!-- IOS中禁用将数字识别为电话号码/忽略Android平台中对邮箱地址的识别 -->
<meta name="format-detection"content="telephone=no, email=no" />
其他meta标签
<!-- 启用360浏览器的极速模式(webkit) -->
<meta name="renderer" content="webkit">
<!-- 避免IE使用兼容模式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- 针对手持设备优化，主要是针对一些老的不识别viewport的浏览器，比如黑莓 -->
<meta name="HandheldFriendly" content="true">
<!-- 微软的老式浏览器 -->
<meta name="MobileOptimized" content="320">
<!-- uc强制竖屏 -->
<meta name="screen-orientation" content="portrait">
<!-- QQ强制竖屏 -->
<meta name="x5-orientation" content="portrait">
<!-- UC强制全屏 -->
<meta name="full-screen" content="yes">
<!-- QQ强制全屏 -->
<meta name="x5-fullscreen" content="true">
<!-- UC应用模式 -->
<meta name="browsermode" content="application">
<!-- QQ应用模式 -->
<meta name="x5-page-mode" content="app">
<!-- windows phone 点击无高光 -->
<meta name="msapplication-tap-highlight" content="no">