22个HTML5 技巧三:我们继续讲解HTML5的技巧。
16. 视频支持
音频元素audio>非常像,在新的浏览器上也支持HTML5视频。事实上,就在最近YouTube宣布了一项新的 HTML5视频嵌入。可惜的是,由于HTML5说明文件并没有为视频指出某个特定的编码器,所以都主要取决于浏览器来决定了。尽管Safari和IE9可以支持H.264 格式的视频,Firefox 和Opera却仍然坚持Theora 和Vorbis格式。因此,显示HTML5视频的时候,你必须提供两种格式。
17. 视频预先加载
你首先需要决定是否需要浏览器来预先加载视频。是否有需要?假设,一个访客进入某个专门用来显示视频的页面,那么就非常有必要预先加载这个页面节省一点等待的时间。你可以通过设置 preload=”preload”来预先加载视频,或者之间添加preload也可以。
video preload>
…
/video>
18. 显示控件
你可能已经注意到,用上面的代码的话,视频将只会显示成一个图片,而没有任何可控制的元件。为了获取这些播放控件,我们必需在视频元素里指定这些控件属性。
video preload controls>
…
/video>
19. 正则表达式
对亏了新模式的属性,我们可以直接在代码中插入一个正则表达式。
form method=post action=”">
label for=”username”>create a username:
input id=”username” type=”text” name=”username” placeholder=”4>
button type=”submit”>Go
如果你比较熟悉正则表达式的话就会注意到这个新模式: [A-Za-z]{4,10}只接受大小写字母。这个字符串最少必需有四个字符,最多是十个字符。
20. 检测浏览器对属性的支持
前面提到过并非所有的浏览器都支持这些属性,那是否有什么方法能够判断浏览器是否能够识别它们呢?这个问题问得非常好,这里给大家介绍两种方式,第一个选择是使用Modernizr来检测,或者你也可以创建并剖析这些元素来看看浏览器都有什么能力。例如,在前面的例子里,如果我们要确定浏览器是否能够执行pattern属性,就可以在页面上添加JavaScript:
alert( ’pattern’ in document.createElement(‘input’) ) // boolean;
实际上,这是确定浏览器兼容性的一种非常常用的方法。jQuery库利用了这个技巧。上面的代码里,我们创建了一个新的输入元素,并确认pattern属性是否能够被识别。如果能够识别的话,浏览器就支持这个功能,否则就不支持。
script>
if (!’pattern’ in document.createElement(‘input’) ) {
// do client/server side validation
}
/script>
记住,这将需要依靠 JavaScript来实现!
21. Mark元素
mark>元素的主要功能就是在页面中高亮显示那些需要在视觉上向用户突出其重要性的文字。包裹在此标签里的字符串必须与用户当前的行为相关。例如,如果我在一些博客中搜索"Open your Mind" ,我可以使用在&mark&标签里使用JavaScript 来包裹每一次动作。
h3> search results /h3>
h6> They were interrupted, just after Quato said, ”Open your Mind”.
22. 何时使用
是否还需要使用

H5 brings a number of new functions and capabilities, greatly improving the interactivity and development efficiency of web pages. 1. Semantic tags such as enhance SEO. 2. Multimedia support simplifies audio and video playback through and tags. 3. Canvas drawing provides dynamic graphics drawing tools. 4. Local storage simplifies data storage through localStorage and sessionStorage. 5. The geolocation API facilitates the development of location-based services.

HTML5 brings five key improvements: 1. Semantic tags improve code clarity and SEO effects; 2. Multimedia support simplifies video and audio embedding; 3. Form enhancement simplifies verification; 4. Offline and local storage improves user experience; 5. Canvas and graphics functions enhance the visualization of web pages.

The core features of HTML5 include semantic tags, multimedia support, offline storage and local storage, and form enhancement. 1. Semantic tags such as, etc. to improve code readability and SEO effect. 2. Simplify multimedia embedding with labels. 3. Offline storage and local storage such as ApplicationCache and LocalStorage support network-free operation and data storage. 4. Form enhancement introduces new input types and verification properties to simplify processing and verification.

H5 provides a variety of new features and functions, greatly enhancing the capabilities of front-end development. 1. Multimedia support: embed media through and elements, no plug-ins are required. 2. Canvas: Use elements to dynamically render 2D graphics and animations. 3. Local storage: implement persistent data storage through localStorage and sessionStorage to improve user experience.

H5 and HTML5 are different concepts: HTML5 is a version of HTML, containing new elements and APIs; H5 is a mobile application development framework based on HTML5. HTML5 parses and renders code through the browser, while H5 applications need to run containers and interact with native code through JavaScript.

Key elements of HTML5 include,,,,,, etc., which are used to build modern web pages. 1. Define the head content, 2. Used to navigate the link, 3. Represent the content of independent articles, 4. Organize the page content, 5. Display the sidebar content, 6. Define the footer, these elements enhance the structure and functionality of the web page.

There is no difference between HTML5 and H5, which is the abbreviation of HTML5. 1.HTML5 is the fifth version of HTML, which enhances the multimedia and interactive functions of web pages. 2.H5 is often used to refer to HTML5-based mobile web pages or applications, and is suitable for various mobile devices.

HTML5 is the latest version of the Hypertext Markup Language, standardized by W3C. HTML5 introduces new semantic tags, multimedia support and form enhancements, improving web structure, user experience and SEO effects. HTML5 introduces new semantic tags, such as, ,, etc., to make the web page structure clearer and the SEO effect better. HTML5 supports multimedia elements and no third-party plug-ins are required, improving user experience and loading speed. HTML5 enhances form functions and introduces new input types such as, etc., which improves user experience and form verification efficiency.


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