视频已经在 Web 上广泛流行了,但是其格式几乎都是专有的。YouTube 使用 Flash,Microsoft 使用 Windows Media®,Apple 使用 QuickTime。在一种浏览器中用来嵌入这些内容的标记在另一种浏览器中是无效的。因此,WhatWG 提议引入一个新的 video 元素,用来嵌入任意视频格式。例如,可以用以下代码嵌入我的 QuickTime 电影 “a Sora in Prospect Park”:
<video src="http://www.cafeaulait.org/birds/sora.mov" />
对于以哪种格式和解码器作为首选,仍然有争议。可能会强力推荐或要求使用 Ogg Theora。还可以可选地支持 QuickTime 等专有格式和 MPEG-4 等受专利限制的格式。实际使用的格式很可能由市场决定,就像是 GIF、JPEG 和 PNG 格式那样(这些格式通过市场竞争压倒了 BMP、X-Bitmap 和 JPEG 2000 等竞争者,成为 img 元素的首选格式)。
还提议引入 audio 元素。例如,可以使用以下代码给 Web 页面加上背景音乐:
<audio src="spacemusic.mp3" autoplay="autoplay" loop="20000" />
autoplay 属性指示浏览器在装载页面后立即开始播放,而不等待明确的用户请求。音频循环播放 20,000 次,然后停止(或者在用户关闭窗口或转到另一个页面时停止)。当然,浏览器可以(而且应该)允许用户关闭内嵌的媒体,不应该只按页面作者的要求去做。
浏览器必须支持 WAV 格式,还可以支持 MP3 等其他格式。
因为老式浏览器不支持这些元素,而且它们对于盲人和聋人用户来说没有意义,所以 audio 和 video 元素可以包含额外的标记,用来描述音频和视频的内容。这对搜索引擎也有帮助。在理想情况下,这些标记是音频和视频内容的完整文字版本。例如,代码8 显示 用 HTML 5 编写的 John F. Kennedy 的就职演说。
<audio src="kennedyinauguraladdrees.mp3"> <p> Vice President Johnson, Mr. Speaker, Mr. Chief Justice, President Eisenhower, Vice President Nixon, President Truman, Reverend Clergy, fellow citizens: </p> <p> We observe today not a victory of party, but a celebration of freedom -- symbolizing an end, as well as a beginning -- signifying renewal, as well as change. For I have sworn before you and Almighty God the same solemn oath our forebears prescribed nearly a century and three-quarters ago. </p> <p> The world is very different now. For man holds in his mortal hands the power to abolish all forms of human poverty and all forms of human life. And yet the same revolutionary beliefs for which our forebears fought are still at issue around the globe -- the belief that the rights of man come not from the generosity of the state, but from the hand of God. </p> <p> ... </p> </audio>
以上就是HTML 5-内嵌媒体的内容,更多相关内容请关注PHP中文网(www.php.cn)!

The tools and frameworks that need to be mastered in H5 development include Vue.js, React and Webpack. 1.Vue.js is suitable for building user interfaces and supports component development. 2.React optimizes page rendering through virtual DOM, suitable for complex applications. 3.Webpack is used for module packaging and optimize resource loading.

HTML5hassignificantlytransformedwebdevelopmentbyintroducingsemanticelements,enhancingmultimediasupport,andimprovingperformance.1)ItmadewebsitesmoreaccessibleandSEO-friendlywithsemanticelementslike,,and.2)HTML5introducednativeandtags,eliminatingthenee

H5 improves web page accessibility and SEO effects through semantic elements and ARIA attributes. 1. Use, etc. to organize the content structure and improve SEO. 2. ARIA attributes such as aria-label enhance accessibility, and assistive technology users can use web pages smoothly.

"h5" and "HTML5" are the same in most cases, but they may have different meanings in certain specific scenarios. 1. "HTML5" is a W3C-defined standard that contains new tags and APIs. 2. "h5" is usually the abbreviation of HTML5, but in mobile development, it may refer to a framework based on HTML5. Understanding these differences helps to use these terms accurately in your project.

H5, or HTML5, is the fifth version of HTML. It provides developers with a stronger tool set, making it easier to create complex web applications. The core functions of H5 include: 1) elements that allow drawing graphics and animations on web pages; 2) semantic tags such as, etc. to make the web page structure clear and conducive to SEO optimization; 3) new APIs such as GeolocationAPI support location-based services; 4) Cross-browser compatibility needs to be ensured through compatibility testing and Polyfill library.

How to create an H5 link? Determine the link target: Get the URL of the H5 page or application. Create HTML anchors: Use the <a> tag to create an anchor and specify the link target URL. Set link properties (optional): Set target, title, and onclick properties as needed. Add to webpage: Add HTML anchor code to the webpage where you want the link to appear.

Solutions to H5 compatibility issues include: using responsive design that allows web pages to adjust layouts according to screen size. Use cross-browser testing tools to test compatibility before release. Use Polyfill to provide support for new APIs for older browsers. Follow web standards and use effective code and best practices. Use CSS preprocessors to simplify CSS code and improve readability. Optimize images, reduce web page size and speed up loading. Enable HTTPS to ensure the security of the website.

h5 pages can generate links in two ways: create links manually or use short link services. By manually creating, you just need to copy the URL of the h5 page; through the short link service, you need to paste the URL into the service and then get the shortened URL.


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mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),