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In HTML5 First Look, author James Williamson introduces the newest HTML specification, providing a high-level overview of HTML5 in its current state, how it differs from HTML 4, the current level of support in various browsers and mobile devices, and how the specification might evolve in the future. Exercise files accompany the course.
Let's put some of what we've learned about the new structuring and semantic capabilities of HTML5 into practice by converting a page using older HTML 4 structuring into a new semantic HTML5 layout. We'll start by focusing on the top-level structural elements first: the header, main content, and in the footer regions. So here I have the trails.htm file open from the 04_02 folder, and I just want to go over the structure a little bit before we go in and convert some of these tags.
So looking through the code, we have a div with an id of wrapper. It's a pretty standard practice to go ahead and wrap all of your content in a div tag, so that stylistically you can do with it what you want. Inside that we have a div with an id of mainHeader that is representing the top heading content of our page. Just below that we have another div and this one has an id of trailInfo. So inside of this, we have our trail guide information for the trail that we're looking at, in this case the Northridge Loop. If I scroll down a little bit, I can see that just below that I have another div with an id of trailNews.
Inside that we have a section that features a promotional video and inside that we have another section that focuses on providing rider reviews. Then if I go down a little bit further, I can see at the very bottom of the page we have a div that is enclosing the footer content of our page. So really, those are our four main sections of the page. We have a header, we have our trailInfo, which is basically the actual trail guide that we're looking at, we have a related news section that's showing us some promotional stuff and allowing riders to publish their own reviews, and finally we just have the page footer information.
So that's the structure we're interested in representing with HTML5 structural tags, and we're going to tackle those top-level elements first. So the first thing I want to do is I'm just going to go ahead and delete this comment up here that says update based on HTML5. That is what we are doing now. So I'm going to go ahead and do that. The next thing I'm going to do is I'll go down and I'll tackle these regions one at a time, and we'll talk about which tag it makes sense to use in that particular area. Now, first, I want to focus on this header region. So we have an opening div tag on line 10 and we have a closing div tag on line 22.
Well, this is heading content and it really makes sense for all this heading content to sit within a header. So I'm going to replace the div tag by highlighting the div, and I'm just going to type in header. I'm going to do the same thing for the closing div tag down here on line 22. I'm going to change that closing div tag to a closing header tag. So now all of that content should be enclosed inside of the header tag. Now, you might have noticed that I did not replace the id, and that might have been one of your first instincts is just go ahead and get rid of the id, because we don't need to tell somebody that's header content right? Well, as you'll see as we continue to structure the page, this isn't the only header tag we're going to use.
So in order to identify this as the main header of the page and be able to target it for styling, we're going to leave that id there and we're going to leave all of our ids there actually. So once again, I'm going to go down and find the div with an id of trailInfo. Now, this one starts on line 23 and ends on line 58. So we've got to remember that it ends on line 58. So again here we need to decide which tag to use for this. Now, it would be tempting to use an article tag here, because this is the information of the Northridge Loop, which is the current trail that we're focusing on.
You might actually expect that content to be published somewhere else or to be repurposed or maybe even syndicated, but there are two pieces of a content that probably would not go with it. Notice, for example, that we have a headline here for Ojai Trails, talking about the region that we're looking at, and we has some navigation here that allows us to go back and look at all trails or their current region of trails that we're looking, which is Ojai. That probably we would not publish. So with that in mind, it really doesn't make sense to use an article tag here. However, I do want to use sectional content, because this is a region of the page that should show up as a discreet element of content within our outline.
So instead of using a div tag, what really makes sense here is a section tag. So I'm going to replace the div tag with the section tag and again, I want the id to remain id="trailInfo". I'm going to scroll all the way down to about line 58 or so, find the closing div tag, and again we're going to change that to a closing section tag. Okay. Now, let's scroll down a little bit more and on line 59 we have the div with an id of trailNews. Now, in most layouts you'd represent this as a sidebar, so it has a promotional video, it has some rider reviews, and this is very good content, very important content, but maybe not as important as the content we just restructured.
So in the case of that, we have to choose between a couple of different types of tags. Again, we could use an article tag if we were going to republish this as separate content, but there are many individual pieces inside the trailNews and I doubt that I'd want to publish it all out as one big element. So probably not an article tag. I could also use another section tag here. There would actually be nothing wrong with that, but I think what I'd rather use here, and I'll highlight the div tag here, is I'd rather use an aside tag. Now, the reason that I would rather use an aside tag here is because this is content that is related to the remaining content on the page, but it's not as important.
So it's not me saying that, hey, this content has an equal amount of importance as the content above it. It's saying that these two are related but that is secondary content. Now, within the outline, you won't notice the difference. They'll still be main level bullet points, but other user agents could infer that difference. So now I'm going to scroll down and find the closing div tag, which is right here on line 80, and I'm going to make sure that I'm closing the aside tag there as well. Now, there is one thing that I want to point out here.
Because this aside tag is not inside the previous section's content, it's not saying that this content is related to the previous section. It's saying that the content is related to all the content on the page. So that would be the header, the trailInfo, and trail guide, and the footer as well. So by leaving it sort of outside and not nesting inside of another tag, we're saying that this content relates to everything on the page. Finally, we need to choose what tag to use for the page footer. Just like the header, it doesn't really need to be its own discreet element within the outline.
So using a section tag or using an aside tag or an article tag really doesn't make sense here. As a matter of fact, there's a tag that is perfect for this, and that would be the footer tag. The footer tag makes sure that its not going to show up within the document outline and it allows us to basically tell any type of user agent that this content is basically the footer content for the entire page. Again, I'm going to leave the id there, so we can target this through styling, and so that it passes a little bit more information about exactly what this content is.
So I'm going to go ahead and save that, and the top-level elements on our page are restructured using these HTML5 tag. So our restructuring is well underway. So the main structural elements of the document have been identified and we're making sure to use tags that are appropriate to the document outline that we want to represent. In our next movie, we'll take the structuring a little bit further by structuring the interior contents of our page regions.
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