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This article mainly explains "what is the development of HTML5". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the developments in HTML5"?

HTML5, known as the killer of Flash, is a revolutionary network technology for web application development. HTML 5 provides some new elements and attributes, some of which are technically similar to tags, but have certain meanings, such as and. This kind of tag will be beneficial to the indexing of search engines, small screen devices and the use of the visually impaired. At the same time, it provides new functions for other browsing elements, through a standard interface, such as and tags.

In addition to the original DOM interface, HTML5 adds a more diverse API:

Real-time two-dimensional drawing

Canvas API: API about dynamic output and rendering graphics, charts, images, and animations.

Scheduled media playback

HTML5 Audio and Video: new elements in HTML5 that provide developers with a universal, integrated, scripted API for dealing with audio and video without installing any plug-ins.

Offline storage database (offline network application)

Editing

Drag and drop

Cross-document communication

Communication / network

Communication APIs: two foundations for building real-time and cross-source (cross-origin) communication: cross-document communication (Cross Document Messaging) and XMLHttpRequest Level 2.

Browse History Management

Header registration for MIME and protocol handlers

Micro data

The above technical notes exist in the WHATWG HTML documentation, but not all of them are included in the W3C HTML5 documentation; some of the technologies are separately described by the W3C, which will not be repeated in this article.

It sounds a little too technical, so what impact will HTML5 have on the design? This is an issue that web designers and developers have to consider after taking the trouble to discuss programming code.

Advantages of HTML5 and web app

In the field of mobile Internet, for example, in the face of so many terminal devices and platforms, designers and developers have to compromise on the consistency of product presentation and experience. and wasted so much of our energy in the process of filling the platform. The product could have reached a higher standard, but the reality of fragmentation of mobile terminals (including hardware and software) blocks the good wishes.

At present, the mainstream mobile phone development platforms are iOS, Symbian, Linux, Palm, BlackBerry, Windows Mobile, Android and so on. Among them, the iOS platform needs to be designed for the resolutions of 480,320,960,640 and 10240,768 respectively; in the Android platform, the QVGA resolution is 240,320,350,400,320,480,480,854 and so on. The Symbian system has a long history. At present, the development is mainly aimed at S60 V3 and V5, and the resolution is still 176208,208208,240,320,240, 352, 416,352 and 800,352 and so on. Even on the same platform, different designs with different resolutions will have corresponding differences. In addition, client-side products require constant update iterations, from version 1.0, version 2.0 to version N.0; every time native app is developed, the platform needs to be laid. And the reality is that not all users will actively update the new version, so designers and developers have to worry about whether the previous version will support it or not when developing new features. Different platforms are multiplied by different versions, manpower and material resources are put into the work of laying the platform, and the energy to improve the product user experience is relatively limited.

So people are fed up with the fragmentation of terminal devices and begin to expect something different from native app. The emergence of web app, developed by HTML5 technology, gives designers and developers a bright vision. The rendering process of HTML5 technology is mainly carried out by browsers, applications with embedded HTML5 parsers, applications that support bookmark opening, or mobile phone products. In this way, the launch and version update of the product no longer take so long to lay out the platform, and the internal logic of Appcelerator will convert the UI of the product into the native interface of platforms such as iOS or Android. At the same time, web app products do not need users to download updates, and can access the latest version through the network; it is also convenient for designers and developers to debug and correct errors, and there is no problem of taking into account both the new and old versions at the same time.

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