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HTML5: Structure, Syntax, and Semantics

Sectioning roots


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HTML5: Structure, Syntax, and Semantics

with James Williamson

Video: Sectioning roots

We are almost done with exploring how HTML5 documents are structured. Now so far, we've covered the outline algorithm, HTML5's four sectional elements, and how headings can be used to title sections and create implicit sections of their own. Now there is, however, one last sectioning element left to discuss, and that is sectioning roots. Sectioning roots contain their own internal outline, but that outline, no matter how complex it is, is not added to any ancestor or parent element's outline.
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  1. 2m 20s
    1. Welcome
      48s
    2. Using the exercise files
      1m 32s
  2. 19m 7s
    1. A brief overview of HTML5
      3m 57s
    2. What's in the HTML5 specification?
      8m 17s
    3. Why do we need new structural elements?
      6m 53s
  3. 50m 33s
    1. Defining HTML5 documents
      5m 5s
    2. HTML5 syntax
      9m 14s
    3. The header element
      5m 22s
    4. The nav element
      4m 55s
    5. The section element
      4m 51s
    6. The article element
      4m 48s
    7. The aside element
      4m 13s
    8. The footer element
      4m 17s
    9. Content model overview
      7m 48s
  4. 35m 28s
    1. Understanding the outline algorithm
      3m 17s
    2. Creating document sections
      8m 25s
    3. Using headings properly
      9m 1s
    4. Using hgroup to override sectioning
      4m 17s
    5. Properly nesting structure
      7m 17s
    6. Sectioning roots
      3m 11s
  5. 58m 30s
    1. Organizing content
      4m 41s
    2. Planning document structure
      5m 47s
    3. Choosing the right structural element
      4m 43s
    4. Checking document outlines
      5m 27s
    5. Coding initial page structure
      5m 28s
    6. Using class and ID attributes
      5m 31s
    7. Structuring headers
      13m 13s
    8. Building navigation
      7m 1s
    9. Structuring footers
      6m 39s
  6. 1h 27m
    1. Working with figure and figcaption
      7m 12s
    2. Grouping content with asides
      3m 46s
    3. Using divs in HTML5
      5m 0s
    4. Working with lists in HTML5
      7m 10s
    5. The return of bold and italic
      5m 52s
    6. Citing works semantically
      6m 32s
    7. Using the address element
      5m 24s
    8. Using the small element
      4m 24s
    9. Using the mark element
      5m 16s
    10. Working with date and time
      11m 55s
    11. Creating block-level links
      8m 53s
    12. Understanding link relationships
      9m 28s
    13. Defining link relationships
      6m 23s
  7. 17m 22s
    1. Current browser support
      7m 38s
    2. Ensuring block-level display
      4m 3s
    3. Adding support for elements in older browsers
      5m 41s
  8. 3m 46s
    1. Additional Resources
      3m 46s

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HTML5: Structure, Syntax, and Semantics
4h 34m Beginner May 31, 2011

Viewers: in countries Watching now:

Gain a deeper understanding of HTML5 and learn how to create richer, more meaningful web pages with structural tags and descriptive attributes. In this course, author James Williamson presents an overview of HTML5 and its development, defines the new tags and attributes, and discusses how browsers parse and display HTML5 content. The course also includes step-by-step instructions for constructing an HTML5 document with a header and footer, navigation, content groups, and formatting.

Topics include:
  • Defining basic elements
  • Exploring the content model
  • Creating document sections
  • Using hgroup to override sectioning
  • Using the proper nesting structure
  • Choosing the right structural element
  • Using class and ID attributes
  • Building navigation
  • Grouping content with asides
  • Using divs in HTML5
  • Creating block level links
  • Defining link relationships
  • Understanding current browser support
  • Adding support for elements in older browsers
Subjects:
Developer Web Web Design Web Foundations Programming Languages Web Development
Software:
HTML
Author:
James Williamson

Sectioning roots

We are almost done with exploring how HTML5 documents are structured. Now so far, we've covered the outline algorithm, HTML5's four sectional elements, and how headings can be used to title sections and create implicit sections of their own. Now there is, however, one last sectioning element left to discuss, and that is sectioning roots. Sectioning roots contain their own internal outline, but that outline, no matter how complex it is, is not added to any ancestor or parent element's outline.

Now essentially, the contents of section roots are hidden from the rest of its parent's element's outline. Now, sectioning root elements are blockquote, details, fieldset, figure, and td, or table depth. Now, the body element is also considered a sectioning root, which could be extremely important if you're merging page content together from multiple pages. So let's take a look at how they work. So here I am again in the HTML5 Outliner, and again, I have saved you the torture of watching me type code. So if you want to do this along with me, once again go ahead and pause your video, go ahead and enter in the code you see here, and start it back when you are done.

Okay, so examining the structure of what we have here inside our Explore California page, we have a single article, and that article contains the Cycle California bike reviews. In addition to the article text, we have two bikes that we are reviewing currently: the Haro Flightline Comp and the Giant Talon. And we also have this other heading right here that says, "This bike is totally rad!! At least that's what everyone says." Now obviously that's a quote where somebody is talking about the Haro Flightline Comp bike, but if we outline this, we can see that that quote is added to the outline.

Now, the obvious solution for that, don't use a heading. But what if you did want to structure it that way? You're certainly within your own rights to do that. Well, remember our sectioning root tags. Remember our sectioning root elements. So this is actually perfect for a blockquote. So what I am going to do is go in and I am going to wrap that heading 3 tag in a blockquote element. And again, I am going to grab the paragraph as well because that's part of the quote, and then we'll go ahead and finish that up. So we're essentially wrapping the quote, which again is with the heading 3 tag on the paragraph as well.

Now when I outline this, as if by magic, it goes away. Now, it's being hidden from the document structure because it's in the blockquote tag, and that essentially means that blockquote has its own internal structure that isn't added to the parent outline. So it has its own outline, and if we could target just that particular element, you would physically see that outline. Now keep in mind that the purpose of these sectioning root elements isn't simply to hide things from the document outline. It is a nice byproduct. It's nice it is working for us. But if you think about which of those elements are sectioning roots, like the blockquote, body, details, fieldset, figure, and td, you know, it simply makes sense to separate their internal outline from any preceding parent outline.

Now, those elements feature content that's self-contained and whose internal structure could really be harmful to the understanding of the overall document outline of who's added to it. So I think it's important to understand how these sectioning roots function, so that when you're planning your document structure, you don't have any nasty surprises a little bit later on when your outlines are generated.

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