Preface
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.
After reading this book, you'll know the basics of everything mentioned above, and
be well on your way to developing amazing HTML5 websites and applications.
Who Should Read This Book
Although this book is meant for HTML5 beginners, it isn't totally comprehensive.
As a result, we do assume some prior knowledge of HTML. If you are completely
new to web development, SitePoint’s Build Your Own Website Using HTML and
CSS1 may be a better book for you.
As we progress through the book, we'll tackle some more advanced topics, such as
APIs and offline applications. To follow these sections, you should be familiar with
HTML and the fundamentals of JavaScript and the Document Object Model (DOM).
It’s unnecessary to have deep knowledge of JavaScript. Still, you should understand
event handling, JavaScript data types, and control structures such as while loops
and if-else conditionals. We’ll keep our script examples simple, though, and explain
them line by line. If you’re unfamiliar with JavaScript, you may like to read
SitePoint’s Simply JavaScript2 by Kevin Yank for an introduction. Mozilla Developer
Network 3also offers fantastic learning resources and documentation for both
JavaScript and the DOM.
this book is great for programing learning
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