1、html标签的类型(head, body, !Doctype)他们 的作用是什么？
!DOCTYPE标签:
他是指示web浏览器关于页面使用哪个html版本进行编写的指令。
head:
是所有头部元素的容器，绝大多数头部标签的内容不会显示给读者。
body:
用于定义文档的主体，包含了文档的所有内容
该标签支持html的全局属性和事件属性。
2、h5新特性
1、新增选择器document.querySelector，document.querySelectorAll
2、拖拽释放（Drag and drop） API
3、媒体播放的video和audio
4、本地存储localStorage和sessionStorage
5、离线应用manifest
6、桌面通知Notifiactions
7、语义化标签 article, footer, header, nav,session
8、增强表单控件：calendar、date、time、email、url、search
9、地理位置 Geolocation
10、多任务 webworker
11、全双工通信协议 websocket
12、历史管理 history
13、跨域资源共享(CORS) Access-Control-Allow-Origin
14、页面可见性改变事件 visibilitychange
15、跨窗口通信 PostMessage
16、Form Data 对象
17、绘画 canvas
【js面试题|前端总复习——html篇】
H5移除的元素：:1、纯表现的元素：basefont、big、center、font、s、strike、tt、u
2、对可用性产生负面影响的元素：frame、frameset、noframes
3、伪类和伪元素
1、伪类：用于已有元素处于某种状态时为其添加对应的样式，这个状态是根据用户行为而动态变化的。
例如：当用户悬停在指定元素时，可以通过:hover来描述这个元素的状态，虽然它和一般css相似，可以为 已有元素添加样式，但是它只有处于DOM树无法描述的状态下才能为元素添加样式，所以称为伪类。
2、伪元素：用于创建一些不在DOM树中的元素，并为其添加样式。例如，我们可以通过:before来在一个元素之前添加一些文本，并为这些文本添加样式，虽然用户可以看见 这些文本，但是它实际上并不在DOM文档中。
4、html5语义化
在HTML5出来之前，我们习惯于用div来表示页面的章节或者不同模块，但是div本身是没有语义的。但是现在，HTML5中加入了一些语义化标签，来更清晰的表达文档结构。
<ul>
<li><nav>
<main>
<article>
>
<aside>
<footer>
>
>
<em>
<mark>
<figure>
<figcaption><blockquoto>
<q>
<time>
<abbr>
<dfn>
<address>
<del>
<ins>
<code>
<meter></code></blockquote><br />
<code>语义化优点：</code><br />
<blockquote><code>1、易于用户阅读，样式丢失的时候能让页面呈现清晰的结构。
2、有利于SEO，搜索引擎根据标签来确定上下文和各个关键字的权重。
3、方便屏幕阅读器解析，如盲人阅读器根据语义渲染网页
4、有利于开发和维护，语义化更具可读性，代码更好维护，与CSS3关系更和谐。
</code></blockquote><br />
5、audio标签中的api<br />
<table>
<thead>
<tr>
<th>属性</th>
<th>属性值</th>
<th>注释</th>
</tr>
</thead>
<tbody>
<tr>
<td>src</td>
<td>url</td>
<td>播放的音乐url地址</td>
</tr>
<tr>
<td>preload</td>
<td>preload</td>
<td>预加载（当页面被加载是进行加载或者说缓冲音频），如果使用了autoplay的话那么该属性失效</td>
</tr>
<tr>
<td>loop</td>
<td>loop</td>
<td>循环播放</td>
</tr>
<tr>
<td>controls</td>
<td>controls</td>
<td>是否显示默认控制条</td>
</tr>
<tr>
<td>autoplay</td>
<td>autoplay</td>
<td>自动播放</td>
</tr>
</tbody>
</table></p>
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