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Wednesday, August 10, 2016

Jump Start HTML5

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HTML (HyperText Markup Language) is the predominant language of web pages. Whenever you read or interact with a page in your browser, chances are it’s an HTML document. Originally developed as a way to describe and share scientific papers, HTML is now used to mark up all sorts of documents and create visual interfaces for browser-based software.

With HTML5, however, HTML has become as much an of API (Application Processing Interface) for developing browser-based software as it is a markup language. In this book, we’ll talk about the history of HTML and HTML5 and explore some of its new features.

HTML5 also improves existing elements. With its new input types, we can create rich form controls without the need for a JavaScript library. For example, if you want a slider input control, you can use <input type=range>. Input types such as email and url add client-side validation to the mix. New audio and video elements let us embed audio and video media directly in our documents. Both elements also have scripting interfaces that we can use to create custom media players or clever visual effects. And we can do this without the need for a plugin in supporting browsers.


We can draw in HTML5 with the addition of the canvas element and support for inline Scalable Vector Graphics (or SVG). The canvas element is a powerful bitmap drawing API that lets us create 2D or 3D images, charts, and games. SVG, on the other hand, uses vector graphics to create reusable, scalable, scriptable images that work across devices and screens.

Perhaps the biggest shift of HTML5 is this: APIs that are part of HTML's document object model, but don't have corresponding markup elements. They are purely DOM APIs that we can use with JavaScript to share and consume data, or create locationaware applications.WebWorkers, mimics multi-threaded JavaScript and background tasks. The Geolocation API lets our apps take location into context. With crossdocument messaging, we can send data between documents, even across domains, without exposing the fullDOMof either. Finally, Server-Sent Events andWebSockets enable near-real time communication between client and server.

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