深入实践HTML5：规范解析与实战应用

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"HTML 5 in action" HTML 5是现代网页开发的核心标准，它极大地扩展了HTML语言的功能，使得开发者可以构建更具交互性和丰富媒体内容的网页。这本书"HTML 5 in Action"由Rob Crowther、Joe Lennon、Ash Blue和Greg Wanish共同撰写，并由Christian Heilmann作序，旨在深入解析HTML 5规范并提供实际应用示例，帮助读者全面理解和掌握这一技术。 HTML 5的新特性包括：语义化的标签如<header>、<nav>、<article>和<footer>，这些元素使网页内容结构更加清晰；离线存储（ Offline Storage）允许网页在没有网络连接的情况下也能运行；Canvas元素提供了动态图形绘制的能力，使得JavaScript可以创建复杂的2D图形；WebGL则带来了3D图形渲染支持，为网页游戏和可视化应用开启新可能；而Video和Audio元素则让视频和音频成为网页的内置组件，不再需要依赖第三方插件。除此之外，HTML 5还强化了表单控件，引入了新的输入类型如date、email、url等，提高了用户体验和数据验证能力。Web Workers和Web Storage则提升了Web应用的性能和响应速度，通过后台线程处理大量计算任务，以及提供更大的本地数据存储空间。书中的实例部分将引导读者实践如何使用HTML 5新特性来构建实际项目，涵盖从基础到高级的应用场景。例如，如何利用WebSocket创建实时通信的应用，或者使用Geolocation API获取用户的位置信息，实现地理位置相关的服务。此外，书中还会讨论浏览器兼容性问题，提供解决策略，确保HTML 5应用能在各种现代浏览器上顺畅运行。 "HTML 5 in Action"不仅适合有一定HTML基础的开发者提升技能，也对初学者提供了一个全面了解和学习HTML 5的入口。通过阅读此书，读者将能够充分利用HTML 5的潜力，开发出更先进、更富表现力的Web应用程序。无论是在移动设备还是桌面端，HTML 5都能提供跨平台的解决方案，让开发者能够构建出适应未来互联网需求的网页应用。

acknowledgments

We’d like to thank our editor at Manning, Renae Gregoire, for putting up with us in

general. Without her reviewing our thousands and thousands of lines of text, sending

weekly status reports, and organizing meetings, this book would never have hap-

pened. She was dropped into our book halfway through the writing process and made

quite the effort to get up to speed as quickly as she could. Also big thanks to our first

editor, Maria Townsley, for getting the ball rolling.

Thanks to everyone at Manning for their extreme patience on this book’s timeline.

They could have released a broken book that was half-baked, but they were really true

to their readers and pushed to produce a great product. Without Troy Mott’s magical

ability to find tech writers, we would never have finished. He staffed the book quickly

and helped when he could with the feedback process.

Thanks also to our

MEAP

readers and peer reviewers whose comments and correc-

tions helped make this a much better book. We would like to acknowledge the follow-

ing reviewers for reading our manuscript at various stages of its development: “Anil”

Radhakrishna, Alexander Esser, Arun Noronha, Chris Zimmerman, Dave Pawson,

Dmitry Skylut, Donald Matheson, Federico Tomassetti, James Hatheway, Jeff Kirkell,

John Ryan

III

, Jonas Bandi, Joseph Morgan, Julio Guijarro, Leonel Waisblatt, Lester

Lobo, Lloyd S. Derbyshire, Michael Caro, Osama A. Morad PhD, Robert Williams,

Sebastian Rogers, Stan Bice, Timothy Hanna, and Tyson S. Maxwell.

Finally, special thanks to Chris Heilmann at Mozilla for contributing the foreword

to our book, and to Adam London for his careful technical proofread of the manu-

script shortly before it went into production.

ACKNOWLEDGMENTS

xvi

Rob Crowther

This is the second set of acknowledgments I've written in less than a year, so take it as

read that all the family, friends, and people who got me started in web development

and whom I thanked in my first book are just as important to me now as they were

then. For this book I’d like to thank my colleagues at work over the last two years for

their (sometimes inadvertent) contributions to my sanity while I was trying to write

two books at once: Ade, Adriana, Alexandru, Amy, Angelique, Annie, Anusha, Boris,

Carlos, Chani, Dan, Danielle, Darren, Dave, David, Delia, Denis, Don, Dorin, Dragos,

Eric, Gary, Gemma, Gifty, Hazel, Indrani, Ioan, Ionel, Jack, Jhumi, Jo, Katie, Liam,

Liming, Lindsay, Lisa, Louise, Marc, Marinela, Mark K., Mark R., Mark W., Martin H.,

Martin J., Mihai, Nancy, Natalie, Nia, Patricia, Paul, Paula, Phil, Razvan, Rhavy, Rob,

Sally, Scott, Sean, Simon, Stella, Sudini, Tal, Tom H., and Tom W. (and if I forgot any-

one, sorry, but you managed to avoid emailing me for two years!).

Joe Lennon

I'd like to thank my wife, Jill, for her love and support—I’d be lost without her. I’d also

like to thank my parents, Jim and Maria; my sisters, Laura and Kelly; the Mac Sweeney

family; and all at Core International. Finally, special thanks to Prof. Ciaran Murphy

and Patricia Lynch at University College Cork and to Troy Mott for bringing me on

board this project in the first place.

Ash Blue

I would like to thank my beautiful wife for contributing artwork and time to make this

book happen, my family for their patience with my writing over the holidays, and also

friends who let me lock myself in a room for over a year to write this thing. Despite

how crazy as I got while trying to balance life and writing this book, I’m happy nobody

carted me off to the funny farm.

Greg Wanish

I would like to thank my parents for supporting my dreams and ambitions throughout

the years. All the adventures and experiences that I had in pursuit of those goals have

given me a wealth of wisdom beyond my grandest expectations.

ABOUT THIS BOOK

xix

Chapter features

Each chapter starts with an “At a Glance” table, letting you see which topics will be

covered in the chapter, with the corresponding page numbers listed for each topic.

Throughout the book, we include Core

API

icons in the margins

that highlight the main topics and help you locate the section you need, quickly

and easily.

Code conventions and downloads

Code samples are presented in a

monospaced

font

this

. It should be noted that

although we attempted to keep code snippets as small as possible, they overflow on

some of the pages. Lines of code that are too wide will overflow onto the next line,

and code sections that take up more than a whole page will continue on the next. To

help with understanding, code sample annotations have been included. These would

normally be written with JavaScript comments such as

/* */

Source code for all chapters in this book is available for download from the pub-

lisher’s site at www.manning.com/crowther2/ or at www.manning.com/

HTML5

inAction,

and from the GitHub repository https://github.com/html5-ia/html5-ia.

Software requirements

To complete this book’s applications, you’ll need the latest version of Chrome on a Mac

or Windows operating system. If additional setup is required to run an app, it will be

stated in the readme.txt file in the source files.

About the authors

Rob Crowther is a web developer and blogger from London,

, and the author of Man-

ning’s Hello!

HTML5

and

CSS3

. Joe Lennon is an enterprise mobile application developer

from Ireland. Ash Blue is the developer for game dev studio Clever Crow Games. As an

indie developer, he utilizes

HTML5

to distribute games to several different platforms. In

the past, he has developed robust front-end architecture and application solutions for

companies such as Hasbro, Tastemaker, and Wikia. His blog is at blueashes.com. Greg

Wanish is an independent developer of client-side web and e-commerce applications. He

also designs and sells a line of graphic and message t-shirts.

Author Online

Purchase of

HTML5

in Action incudes free access to a private web forum run by Man-

ning Publications, where you can make comments about the book, ask technical ques-

tions, and receive help from the authors and from other users. To access the forum

and subscribe to it, point your web browser to www.manning.com/

HTML5

inaction.

This page provides information on how to get on the forum once you are registered,

what kind of help is available, and the rules of conduct on the forum.

Core API

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