Peter Lubbers - Pro HTML 5 Programming

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10 CHAPTER 1 ■ OVERVIEW OF HTML5 Table 1-1. HTML5 Content Types Content Type Description Embedded Content that imports other resources into the document, for example audio, video, canvas, and iframe Flow Elements used in the body of documents and applications, for example form, h1, and small Heading Section headers, for example h1, h2, and hgroup Interactive Content that users interact with, for example audio or video controls, button, and textarea Metadata Elements—commonly found in the head section— that set up the presentation or behavior of the rest of the document, for example script, style, and title Phrasing Text and text markup elements, for example mark, kbd, sub, and sup Sectioning Elements that define sections in the document, for example article, aside, and title All of these elements can be styled with CSS. In addition, some of them, such as canvas, audio, and video, can be used by themselves, though they are accompanied by APIs that allow for fine-grained native programmatic control. These APIs will be discussed in much more detail later in this book. It is beyond the scope of this book to discuss all these new elements, but the sectioning elements (discussed in the next section) are new. The canvas, audio, and video elements are also new in HTML5. Likewise, we’re not going to provide an exhaustive list of all the deprecated tags (there are many good online resources online for this), but many of the elements that performed inline styling have been removed in favor of using CSS, such as big, center, font, and basefont. Semantic Markup One content type that contains many new HTML5 elements is the sectioning content type. HTML5 defines a new semantic markup to describe an element’s content. Using semantic markup doesn’t provide any immediate benefits, but it does simplify the design of your HTML pages, and in the future, search engines will definitely be taking advantage of these elements as they crawl and index pages. As we said before, HTML5 is all about paving the cow paths. Google analyzed millions of pages to discover the common ID names for DIV tags and found a huge amount of repetition. For example, since many people used DIV id="footer" to mark up footer content, HTML5 provides a set of new sectioning elements that you can use in modern browsers right now. Table 1-2 shows the different semantic markup elements.
Table 1-2. New sectioning HTML5 elements Sectioning Element Description header Header content (for a page or a section of the page) footer Footer content (for a page or a section of the page) section A section in a web page article Independent article content aside Related content or pull quotes nav Navigational aids CHAPTER 1 ■ OVERVIEW OF HTML5 All of these elements can be styled with CSS. In fact, as we described in the utility design principle earlier, HTML5 pushes the separation of content and presentation, so you have to style your page using CSS styles in HTML5. Listing 1-1 shows what an HTML5 page might look like. It uses the new DOCTYPE, character set, and semantic markup elements—in short, the new sectioning content. The code file is also available in the code/intro folder. Listing 1-1. An Example HTML5 Page HTML5 Header Subtitle HTML5 Rocks! 11
Page 1 and 2: THE EXPERT’S VOICE ® IN WEB DEVE
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Page 5 and 6: For my beautiful wife, Vittoria, an
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Page 19 and 20: Introduction HTML5 is brand new. In
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C H A P T E R 3 ■ ■ ■ Working
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Audio and Video Codecs CHAPTER 3
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Table 3-1. Browser support for HTML
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MEDIA FOR EVERYONE CHAPTER 3 ■ WO
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CHAPTER 3 ■ WORKING WITH HTML5 AU
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Table 3-4 shows a few of the read-o
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find the actual frame since the vid
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LOSING VIEWERS IN THE OF AN EYE CH
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C H A P T E R 4 ■ ■ ■ Using t
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A device can use any of the followi
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Table 4-4. Pros and cons of cell ph
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Figure 4-1. HTML5 Geolocation brows
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CHAPTER 4 ■ USING THE HTML5 GEOLO
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Listing 4-6. The Haversine formula
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Listing 4-9. Adding the loadDemo()
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THE EASIEST WAY TO TRAVEL CHAPTER 4
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var deltaLatitude = toRadians(latit
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Practical Extras CHAPTER 4 ■ USIN
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Show Me on a Google Map CHAPTER 4
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CHAPTER 5 ■ USING THE COMMUNICATI
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var defaultTitle = "Portal [http://
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Send Notification CHAPTER 5 ■ U
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Figure 5-4. Difference between clie
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“SEEMINGLY ARBITRARY” TIMES CHA
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crossOriginRequest.upload.onprogres
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Figure 6-1. The complexity of real-
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Listing 6-2. The WebSocket interfac
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Listing 6-4. HTTP response header H
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Figure 6-4. Latency comparison betw
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EXISTING WEBSOCKET SERVERS CHAPTER
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CHAPTER 6 ■ USING THE HTML5 WEBSO
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def terminate(self): self.ready_sta
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Basic API Usage CHAPTER 6 ■ USING
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HTML5 WebSocket / Geolocation Track
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C H A P T E R 11 ■ ■ ■ The Fu
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Figure 11-1. Quake II 3D Shaders CH
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CHAPTER 11 ■ THE FUTURE OF HTML5
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270 ■ INDEX unsupported, 68 using
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284 ■ INDEX stopping Web Workers,
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Peter Lubbers - Pro HTML 5 Programming

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