4 May 2014: New revision is now available. Fully revised and re-edited.
HTML5 web applications are now capable of matching or exceeding the scale and sophistication of desktop applications, but with the unique advantage of running natively inside the web browsers on billions of desktop computers, phones, TVs and tablets.
This revolution (or more correctly – evolution) has happened for a number of reasons:
Browsers have introduced new standards-based APIs allowing web applications to (amongst other things) store data offline, retrieve data from the server dynamically, spawn background processes and interact with the filesystem.
Software engineers and programmers have begun to think of the much maligned javascript language in a new light, and unlock its potential as a rich and expressive language capable of producing large scale, well-structured applications.
The jQuery library has eased the pain of interacting with Document Object Model, and therefore writing applications that dynamically respond to user interaction.

The HTML markup language has been overhauled and extended to provide more semantic meaning, and many additional elements and attributes.

2014年5月4日。新的修订版现已面世。全面修订和重新编辑。

HTML5网络应用程序现在能够匹配或超过桌面应用程序的规模和复杂性，但具有独特的优势，可以在数十亿台台式电脑、手机、电视和平板电脑的网络浏览器中原生运行。

这场革命（或者更正确地说--进化）的发生有很多原因。

浏览器引入了新的基于标准的API，允许网络应用程序（除其他外）离线存储数据，从服务器动态检索数据，生成后台进程并与文件系统互动。

软件工程师和程序员已经开始从一个新的角度来看待备受诟病的javascript语言，并发掘其作为一种丰富的、有表现力的语言的潜力，能够产生大规模的、结构良好的应用程序。

jQuery库减轻了与Document Object Model互动的痛苦，因此编写的应用程序可以动态地响应用户互动。

HTML标记语言已经被全面修改和扩展，以提供更多的语义，以及许多额外的元素和属性。